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The Ocean Observatories Initiative (OOI) is a long-term NSF-funded program that deploys autonomous sensors on both moored and mobile platforms at multiple locations, including the Global Irminger Sea Array (60.46°N, 38.44°W) (Trowbridge et al., 2019). The OOI program conducts yearly turn-around cruises to the Irminger Sea Array to recover and redeploy moorings and gliders deployed year-round at this site. During these cruises the OOI program routinely conducts Conductivity Temperature Depth (CTD) casts and collects water samples from Niskin bottles on the CTD rosette for discrete sample analysis. These turn-around cruise data are critical for validation and calibration of the data from sensors deployed year-round and also provide a valuable dataset in and of themselves (Palevsky et al., 2023).

This dataset uses data collected by the OOI program during turn-around cruises of the Irminger Sea Array in 2023, 2024, and 2025, alongside supplementary samples collected for this project during the AR30-03 and AR35-05 cruises (see related dataset Palevsky et al., 2023) to produce calibrated, quality-controlled oxygen depth profiles.

The complete collection of shipboard data and cruise documentation from these cruises is available at https://rawdata.oceanobservatories.org/files/cruise_data/. Unprocessed CTD data can be found within the Ship_Data/ctd/data folder while discrete water samples can be found within the Water_Sampling folder for each cruise year.

16:T10fe,WOCE quality flags for CTD pressure, temperature and salinity are carried over from corresponding calibrated profile or bottle files. WOCE quality flags: 1 = Not calibrated with water samples 2 = Acceptable measurement 3 = Questionable measurement 4 = Bad measurement 9 = Not sampled Quality flags applied to this dataset follow the recommendations of Jiang et al. 2022: 1 = not evaluated/quality unknown 2 = acceptable 3 = questionable 4 = known bad 6 = median of replicates 9 = Missing value Irminger Sea 1 Deployment Cruise KN221-04: Use of CTD oxygen data data from KN221-04 is generally poor due to suspected fouling and should be approached with caution. An oxygen sensor gain of 1.3675 was determined for this cruise; SBE recommends sensor maintenance for oxygen sensor gains greater than 1.2. All oxygen data has been flagged as questionable with the high gain correction likely resulting in oxygen concentrations that are biased low. For discrete water samples, there are discrepancies between bottle numbers (Niskin bottles) created by the SBE data processing software and bottle numbers (Niskin bottles) associated with shipboard Winkler analysis in OOI water sampling logs available in the OOI Raw Data Archive. Irminger Sea 2 Deployment Cruise AT30-01: None Irminger Sea 3 Deployment Cruise AR07-01: Oxygen data collected at Stations 1-4 were not calibrated since casts at Stations 1-4 measured a very different water mass in the Western Labrador Sea, and these casts were not associated with any discrete oxygen samples. Surface oxygen measurements in the upper ~50 m of the downcast profile at Station 10 have been flagged as questionable. Irminger Sea 4 Deployment Cruise AR21: Oxygen and salinity sensors experienced issues consistent with clogging of the pump at Stations 1-8 and data was not salvageable. The pump was changed prior to Station 9. An oxygen sensor gain of 1.2218 was determined for this cruise and applied to Stations 9 -12, which is slightly over the recommended sensor maintenance gain value of 1.2. Irminger Sea 5 Deployment Cruise AR30-03: CTD data collected at Stations 7-12 experienced issues associated with biofouling. Portions of Casts from stations 7-8 and 11-12 have been flagged as questionable as they exhibit behavior indicative of biofouling. Irminger Sea 6 Deployment Cruise AR35-05: Oxygen profiles were collected using an Aanderaa optode because of issues with the SBE43-DO sensor. All data has been flagged as questionable because of the inability for Aanderaa optodes to resolve strong oxygen gradients at CTD rosette profiling speeds. A broken pylon resulted in no discrete water samples for calibration prior to Station 11. Irminger Sea 7 Deployment Cruise AR46: COVID-affected cruise. No discrete oxygen measurements for AR46. Oxygen profiles from AR46 were collected using an Aanderaa optode that was calibrated during the previous cruise (AR45) using water samples that were stored and not measured onboard. All data has been flagged as questionable because of these issues and also because of the inability for Aanderaa optodes to resolve strong oxygen gradients at CTD rosette profiling speeds. Irminger Sea 8 Deployment Cruise AR60-01: Examination of Winklers and CTD-measured oxygen values revealed issues with Winklers collected from casts 5 -12. Residuals from casts 5-12 were relatively large and more than half of the Winklers were flagged as outliers. Also, oxygen data collected on the upcast from Cast 10 between ~750 - 920 db is consistent with pump clogging and has been flagged as questionable. Irminger Sea 9 Deployment Cruise AR69-01: None Irminger Sea 10 Deployment Cruise AR76-03: Several issues with the SBE43 oxygen sensor contributed to the inability to produce Winkler-calibrated shipboard oxygen profiles for scientific use including electrode serial number documentation, electrode behavior, and pump issues with the CTD package. Irminger Sea 11 Deployment Cruise AR84-01: Winklers were collected starting with Cast 5 and ending with Cast 18. To provide calibrated oxygen data for Casts 2-4 and 19, the station dependent calibration coefficient (SOCcn) was assumed to be consistent over the course of the cruise. Irminger Sea 12 Deployment Cruise RR2505: None. 17:T6e14,

SeaBird processing

CTD data are processed using SeaBird data processing software. The raw 24 Hz CTD data are converted from HEX to ASCII, lag corrected, edited for large spikes, smoothed according to sensor, and pressure averaged for final data quality control and analysis. Table 1 summarizes the order in which SeaBird Modules were processed and the inputs applied during each module.

DATCNV: Convert the raw data (.hex) to pressure, temperature, conductivity, and dissolved oxygen (V) to a file with a .cnv extension. Use default hysteresis correction
BOTTLESUM: Writes out a summary of the bottle data to a file with a .btl extension
ALIGNCTD: Advance Oxygen raw [V] by time determined by processing relative to pressure
WILDEDIT: Checks for and marks ‘wild’ data points: first pass 2.0 standard deviations; second pass 20 standard deviations
CELLTM: Conductivity cell thermal mass correction; alpha = 0.03 and 1/beta = 7.0
FILTER: Low pass filter pressure and depth (DO [V]) with a time constant of 0.15 seconds to increase pressure resolution for LOOPEDIT
LOOPEDIT: Mark scans where the CTD is moving less than the minimum velocity (0.25 m/s) or traveling backward due to ship roll.
BINAVG: Average data into 1 or 2 db pressure bins to match bottle-calibrated salinity files (when available)
SPLIT (u or d): Split .cnv file into upcast and downcast files. Files are appended automatically with leading u or d

Post-processing SBE oxygen calibrations

To produce the best possible oxygen measurements, post-processing procedures were modeled after methods described in Uchida et al. 2010. The following Seabird-recommended calibration equation was used to calibrate the SBE-43 oxygen sensor data:

O2= SOC(V+ Voff)* Oxysol(T,S)*(1 + A*T + B*T2 + C*T3) * eE*p/(273.15 +T) (Equation 1)

where O2 is the CTD oxygen [μmol/kg], V is the output voltage signal processed with the SBE default hysteresis correction [volts], Oxysol is the oxygen saturation [μmol/kg], T is temperature [deg C], S is salinity [psu], and P is pressure [dbar] (SBE Application Note 64-2). Coefficients for the oxygen calibration slope (SOC); voltage offset at 0 (Voff); temperature-related calibration coefficients of A, B and C; and pressure-related E term were determined initially from an 18-point factory calibration and provided by the manufacturer (Appendix A). Voff, A, B, and C are constant over the sensor life while values for SOC and E can be optimized using discrete water samples measured analytically for dissolved oxygen, and commonly referred to as Winklers.

Calibration coefficients for SOC and E were optimized by applying a non-linear least-squares fit to Winkler samples while calibration coefficients for A, B, C, and Voff were held constant. Oxygen sensor hysteresis due to pressure effects on the sensor membrane was improved by enabling the Seabird default hysteresis correction (Edwards et al. 2010; SBE Application Note 64-3). The optional response time correction, or tau correction, was determined to add excessive signal noise in relatively stable, deep portions of the water column; and, therefore, was not applied in the calibration equation.

While using this approach, a non-linear functional fit of Equation 1 was first attempted using one set of coefficients for the entire data set (whole cruise). Model fits were iterative with outliers discarded. Outliers were determined as values more than three scaled median absolute deviations from the median.

With outliers removed, residuals between CTD values and water sample values were then examined as a function of pressure, temperature, oxygen concentration, and cast number (≈ cruise time). An examination of the residuals as a function of cast number was used to 1) identify episodic events resulting in abrupt changes in SOC values, and 2) determine potential drift in SOC over the course of the cruise. After examining the residuals, cast numbers were grouped if necessary to minimize the residuals with an attempt to limit the number of groups used per cruise. New calibration coefficients were then determined for each group.

If a linear drift as a function of cast number (cn) or cruise time (dt) was determined for a group, a linear correction of the SOC drift was applied to the group while keeping other coefficients constant. The linear drift as a function of cast number/cruise time was then incorporated into the calibration equation, replacing SOC in Equation 1 as a function of cruise number/cruise time as:

SOCcn/dt = SOC1 + F*cn/dt (Equation 2)

where cn or dt is the cast number [-] or time since first cast [d], respectively. SOC1 is the initial SOC value, and F is the rate of SOC change per cast number or day since first cast.

A nonlinear functional fit including the cast or time-dependent SOCcn/dt was then fit to the group determining coefficients for E, SOC1, and F while holding A, B, C, and Voff constant. After iterative fitting and outliers removed, residuals were examined again as a function of pressure, temperature, oxygen concentration and cast number to ensure no linear dependence of residuals as a function of time. Outliers were determined as values more than three scaled median absolute deviations from the median.

For each cruise, CTD-derived measurements of salinity and oxygen solubility were calculated using the TEOS-10 Gibbs-SeaWater Oceanographic Toolbox (McDougall and Barker, 2011). Measurements from primary CTD sensors recorded in line with the SBE43 oxygen sensors were used to calculate oxygen concentrations unless collected data was poor. In these instances, measurements from the secondary CTD sensors were used. Bottle-calibrated CTD salinity measurements were used to produce oxygen concentrations when available (Years 5 - 9). The measurements of temperature, salinity, pressure and oxygen voltage (processed with SBE default hysteresis correction) used to produce oxygen concentration profiles are included in files for downcasts (indicated with ‘d’ appended) or upcasts (indicated with ‘u’ appended).

Throughout this documentation, oxygen profiles calibrated using a constant SOC value are indicated by SOCk while oxygen profiles calibrated using an SOC term that varies with time or cast (station) number are indicated by SOCdt and SOCcn, respectively. Lastly, oxygen sensor gain is determined as the Winkler-determined SOC value over the factory-determined SOC to assess changes in oxygen calibration slope since factory calibration. Note, the manufacturer recommends factory service inspection and calibration for a SBE43 DO sensor with a gain correction greater than 1.2 from the original factory value (Application Note 64-2).

Post-processing Aanderaa oxygen calibrations

Oxygen concentration was calculated from raw Aanderaa oxygen optode output in volts following the methods detailed in Bittig et al. (2018). Raw voltage outputs are converted to calphase, which is used to calculate oxygen concentration using the optode-specific calibration coefficients from factory calibration, the Stern Volmer equation, and compensation equations to correct for salinity and pressure effects. The measurements of temperature, salinity (bottle-calibrated), pressure, and raw Aanderaa voltage used to produce oxygen concentration profiles are included in files for downcasts (indicated with ‘d’ appended) or upcasts (indicated with ‘u’ appended).

Aanderaa optodes are not routinely used for profiling applications on shipboard CTD casts, since oxygen optodes have a significantly slower response time than Clark electrodes such as the SBE43. This complicates or precludes the ability to resolve strong oxygen gradients at the speed at which CTD rosettes are routinely raised and lowered. Aanderaa optode data were used in place of SBE43 oxygen sensor on cruises where the SBE43 was malfunctioning (AR35-05; August 2019) or was unable to be calibrated with shipboard discrete oxygen measurements (AR46; August 2020). The time lag was quantified by empirically determining the optode’s temperature-dependent boundary layer thickness based on paired upwards and downwards profiles (Gordon et al. 2020) and corrected for following the methods of Bittig and Kortzinger (2017), using the optode-response-time code provided by Gordon et al.

Bottle dissolved oxygen samples were used to calculate a gain correction for the Aanderaa optode after all other corrections were applied. Because of the optode’s inability to resolve strong oxygen gradients at CTD profiling speeds, only Winkler samples collected in relatively stable sections of the water column (below 500 m) were used to determine the Aanderaa optode gain correction.

Irminger Sea 1 Deployment Cruise KN221-04

A complete cruise report and results of water sample analyses for KN221-04 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of nine CTD casts were performed on-board the R/V Knorr. Bottle-calibrated CTD salinity measurements are not available for this cruise; however, the shipboard measurements of salinity were used to validate the CTD-derived salinity measurements. The oxygen sensor was switched from SN 1646 to SN 1679 prior to Station 2. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor data 4 seconds relative to the pressure sensor data. Data from the primary CTD sensor package was used to determine SBE oxygen concentrations.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were attempted using a non-linear least squares fit between CTD oxygen values and 44 Winkler samples from Casts 2-9. The model fit using all Winklers was poor with a RMSE of 9.95 μmol/kg, R2 value of -0.543 and no outliers determined. An inspection of residuals (Winkler - SOCk model) determined a negative correlation between residuals and CTD DO concentrations. Negative correlation between residuals and CTD DO concentrations in conjunction with the determined high oxygen sensor gain value of 1.368 suggests that fouling of the oxygen sensor membrane greatly impacted the oxygen data collected. In order to salvage interpretable oxygen data from this cruise, a non-linear functional fit of the calibration equation was performed using 4 Winkler samples collected at Station 4 (RMSE = 2.98 μmol/kg, R2 = 0.922, n = 4). The calibration coefficients determined from Station 6 were then applied to data collected at Stations 2-9.

Irminger Sea 2 Deployment Cruise AT30-01

A complete cruise report and results of water sample analyses for AT30-01 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 13 CTD casts were performed on-board the R/V Atlantis. Bottle-calibrated CTD salinity measurements are not available for this cruise; however, the shipboard measurements of salinity were used to validate the CTD-derived salinity measurements. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor (SN 0712) data 8 seconds relative to the pressure sensor data. Data from the primary CTD sensor package was used to determine SBE oxygen concentrations.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were determined using a non-linear least squares fit between CTD oxygen values and 106 Winkler samples from Station 1-13. Residuals (Winkler - SOCk model) were found to be linearly dependent on station number. Application of the non-linear regression model using a station-dependent SOC term (Equation 2) was found to further minimize the residuals between Winkler oxygen and CTD oxygen. No relationship between residuals (Winkler- SOCcn model) and pressure, temperature, station or oxygen concentration remained. The SOCcn model (RMSE = 1.03 μmol/kg, R2 = 0.999, n = 106) flagged 1 Winkler sample (0.94%) as an outlier.See the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results.

Irminger Sea 3 Deployment Cruise AR07-01

A complete cruise report and results of water sample analyses for AR07-01 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 10 CTD casts were performed on-board the R/V Armstrong. Bottle-calibrated CTD salinity measurements are not available for this cruise; however, the shipboard measurements of salinity were used to validate the CTD-derived salinity measurements. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor (SN 0338) data 4 seconds relative to the pressure sensor data. Data from the primary CTD sensor package was used to determine SBE oxygen concentrations.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were determined using a non-linear least squares fit between CTD oxygen values and 69 Winkler samples from Station 5-10. Residuals (Winkler - SOCk model) were minimized by creating two groups. Group 1 consisted of Stations 5 and 6 and Group 2 consisted of Stations 7- 10. Residuals in both groups were found to be linearly dependent with cruise time. Application of the non-linear regression model using a time-dependent SOC term (Equation 2) was found to further minimize the residuals between Winkler oxygen and CTD oxygen. No relationship between residuals (Winkler- SOCdt model) and pressure, temperature, station or oxygen concentration remained with the SOCdt model fit. The SOCdt model for Group 1 (RMSE = 1.3 μmol/kg, R2 = 0.956, n = 23) flagged no outliers.The SOCdt model for Group 2 (RMSE = 0.806 μmol/kg, R2 = 0.994, n = 46) flagged 2 Winklers (4.3%) as outliers. See the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results.

Irminger Sea 4 Deployment Cruise AR21

A complete cruise report and results of water sample analyses for AR21 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 12 CTD casts were performed on-board the R/V Armstrong. Salinity and oxygen data at Stations 1-8 experienced issues consistent with clogging of the CTD pump. The primary CTD package pump was switched prior to Station 9. Bottle-calibrated CTD salinity measurements are not available for this cruise; however, the shipboard measurements of salinity were used to validate the CTD-derived salinity measurements. The hysteresis between upcast and downcast oxygen data due to sensor response time was minimized by not advancing the oxygen sensor (SN 0930) data relative to the pressure sensor data. Data from the primary CTD sensor package was used to determine SBE oxygen concentrations for Casts 9 –12.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were determined using a non-linear least square fit between CTD oxygen values and the 35 Winkler samples collected at Stations 10-12. Residuals (Winkler - SOCk model) determined using a constant SOC revealed no relationship between residuals and pressure, temperature, station or oxygen concentration. The SOCk model (RMSE = 0.968 μmol/kg, R2 = 0.988, n = 35) flagged 2 Winkler samples (5.7%) as outliers.See the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results.

Irminger Sea 5 Deployment Cruise AR30-03

A complete cruise report and results of water sample analyses for AR30-03 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 23 CTD casts were performed on-board the R/V Armstrong. CTD-derived salinity data were calibrated by Leah McRaven using discrete bottle samples, and results are summarized in the AR30-03 CTD Calibration Report. The secondary CTD package is recommended for calibration use on this cruise; therefore, the temperature, bottle-calibrated salinity and depth data from the secondary CTD package were used in the oxygen sensor calibration equation to calibrate SBE43 (SN 0113) oxygen sensor data. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor data 6 seconds relative to the pressure sensor data.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were first attempted using a non-linear least squares fit between CTD oxygen values and all 271 Winkler samples. Examination of residuals (Winkler - SOCk model) revealed higher residuals associated with Casts 10 and 21, perhaps due to sensor fouling. Therefore, calibration coefficients for SOC and E in Equation 1 were determined for all casts but 10 and 21 using a non-linear least squares fit between CTD oxygen values and 179 Winkler samples while calibration coefficients for A, B, C, and Voff were held constant at their factory-determined values. The SOCk model (RMSE = 1.31 μmol/kg, R2 = 0.989, n = 172) flagged 7 Winkler samples (4.1%) as outliers.

Calibration coefficients for SOC were then determined for casts 10 and 21 (both < 1000 m) while using pressure-associated E values determined from Casts 1-9, 11-20, 22-23 (included samples greater than 1000 m). The SOCk model for Cast 10 (RMSE = 0.62 μmol/kg , R2 = 0.998, n =42 ) flagged 10 Winkler samples (19.2%) as outliers, while the SOCk model for Cast 21 (RMSE = 0.80 μmol/kg, R2 = 0.996 , n = 34 ) flagged 6 Winkler samples (15.0%) as outliers. After optimizing calibration coefficients, no relationship between residuals (Winkler- SOCk model) and pressure, temperature, station or oxygen concentration remained. See the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results.

Irminger Sea 6 Deployment Cruise AR35-05

A complete cruise report and results of water sample analyses for AR35-05 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A number of issues affected the quality of CTD-measured hydrographic and oxygen data on this cruise. Briefly, major biofouling issues were observed for all primary CTD sensors (temperature, salinity, and oxygen) resulting in no usable CTD-DO oxygen measurements for AR35-05. Therefore, an Aanderaa optode (SN 502) was integrated into the CTD rosette prior to Station 3. Additionally, failure of the pylon on the CTD rosette resulted in no bottle samples fit for calibration purposes prior to Station 11. Salinity data collected by the secondary CTD package were bottle calibrated for Stations 11-13 by Leah McRaven and results are summarized in AR35-05 CTD Calibration Report. Temperature, salinity, and pressure data collected by the secondary CTD package were used to calculate Aanderaa optode oxygen concentrations on this cruise for Stations 3-12.

Oxygen calibration Results

Oxygen concentrations were calculated from raw Aanderaa oxygen optode output in volts following the methods detailed in Bittig et al. (2018). Raw voltage outputs were converted to oxygen concentration using the optode-specific calibration coefficients from factory calibration, the Stern Volmer equation, and compensation equations to correct for salinity and pressure effects. Using the approach of Gordon et al. (2020), paired downcasts and upcasts were used to determine and then correct an optode time lag of 13 sec at a reference temperature of 4℃. A total of 55 Winklers (sampled at greater than 500 m) were used to calculate a gain correction of 1.0023 for the Aanderaa optode (SN 502) integrated into the CTD rosette. After applying the gain correction, absolute bias between Winklers and Aanderaa DO was 1.1 ± 0.96 μmol/kg (n = 55). Residuals (Winkler - Aanderaa DO) showed no relationship with pressure, temperature, station or oxygen concentration.

Irminger Sea 7 Deployment Cruise AR46

A complete cruise report and results of water sample analyses for AR46 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 19 CTD casts were performed on-board the R/V Armstrong. CTD-derived salinity data were calibrated by Leah McRaven using discrete bottle samples, and results are summarized in the AR46 CTD Calibration Report. Temperature, bottle-calibrated salinity and depth data from the primary CTD package were used to calculate oxygen concentrations at Stations 1-10 and 18-19 while bottle-calibrated data from the secondary CTD package were used to calculate oxygen concentrations at Stations 12-17 .

The COVID-19 pandemic presented a number of challenges for sea-going operations in 2020. Traditionally, Winkler measurements are made at sea by trained technicians; however, in 2020 discrete samples for oxygen were collected and stored until subsequent analysis back on land to minimize shipboard personnel. The storage of discrete oxygen samples according to methods described by Zhang et al. (2002) allowed for quality measurements from the previous cruise (AR45) but not from AR46. As a result, there are no discrete oxygen measurements for calibration purposes for AR46. Additionally, the SBE43 oxygen sensor was changed between AR45 and AR46 excluding the possibility of using the SBE43 oxygen calibration coefficients determined on AR45 on oxygen data collected on AR46. However, the same Aanderaa optode (SN 277) was integrated into the CTD rosette for both AR45 and AR46. Aanderaa optodes are relatively stable in their calibration, allowing the gain correction determined on AR45 to be applied to optode data collected during AR46.

Oxygen calibration Results

A total of 17 Winklers (sampled at greater than 500 m) from AR45 were used to calculate a gain correction for the Aanderaa optode (SN 277) integrated into the CTD rosette. Upon inspection, residuals (Winklers - Aanderaa DO) revealed a linear relationship between residuals and pressure using the standard pressure correction coefficient of 0.032 (Uchida et al. 2008). The pressure correction coefficient was then adjusted to 0.027 in order to remove the residual relationship with pressure, and resulted in a gain correction of 1.1386. After application of the gain correction, absolute bias between Winklers and Aanderaa DO was 0.74 ± 0.58 μmol/kg (n = 17) for AR45. The gain and adjusted pressure correction value D determined during AR45 were then applied to optode data collected during AR46.

Irminger Sea 8 Deployment Cruise AR60-01

A complete cruise report and results of water sample analyses for AR60-01 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 12 CTD casts were performed on-board the R/V Armstrong. CTD-derived salinity data were calibrated by Leah McRaven using discrete bottle samples, and results are summarized in the AR60-01 CTD Calibration Report. This temperature, bottle-calibrated salinity and depth data from the primary CTD package were used in the oxygen sensor calibration equation to calibrate SBE43 (SN 0444) oxygen sensor data from this cruise. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor data 8 seconds relative to the pressure sensor data.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were attempted using a non-linear least square fit between CTD oxygen values and the 134 Winkler samples collected (RMSE = 5.85 μmol/kg, R2 = 0.906, n = 79). Residuals were relatively large and more than half the Winklers were flagged as outliers. Examination of Winklers and CTD-measured oxygen values revealed issues with Winklers collected from casts 5 -12. Therefore, calibration coefficients for SOC and E in Equation 1 were determined using a non-linear least squares fit between CTD oxygen values and the 30 Winkler samples from casts 2 and 4. Residuals (Winkler - SOCk model) determined using a constant SOC revealed no relationship between residuals and pressure, temperature, station or oxygen concentration for the two stations used. The SOCk model (RMSE = 1.41 μmol/kg, R2 = 0.997, n = 23) flagged 7 Winkler samples (23.3%) as outliersSee the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results. These calibration coefficients were applied to CTD oxygen data collected at Stations 1 through 12.

Irminger Sea 9 Deployment Cruise AR69-01

A complete cruise report and results of water sample analyses for AR69-01 are available in the OOI Raw Data Archive (see further access notes in the Description section of this metadata page). A total of 23 CTD casts were performed on-board the R/V Armstrong. The CTD experienced hardware issues that were sorted prior to Cast 6. CTD-derived salinity data were calibrated by Leah McRaven using discrete bottle samples, and results are summarized in the AR69-01 CTD Calibration Report (in prep). Bottle-calibrated salinity data from the primary CTD package were used in the oxygen sensor calibration equation to calibrate SBE43 (SN 1960) oxygen sensor data from this cruise. The hysteresis between upcast and downcast oxygen data due to sensor response time was removed by advancing the oxygen sensor data 6 seconds relative to the pressure sensor data.

Oxygen calibration Results

Calibration coefficients for SOC and E in Equation 1 were determined using a non-linear least squares fit between CTD oxygen values and 157 Winkler samples while calibration coefficients for A, B, C, and Voff were held constant at their factory-determined values (Appendix A). Residuals (Winkler - SOCk model) determined using a constant SOC were found to be linearly dependent on station number. Application of the non-linear regression model using a time-dependent SOC term (Equation 2) was found to further minimize the residuals between Winkler oxygen and CTD oxygen, and no relationship between residuals (Winkler- SOCdt model) and pressure, temperature, station or oxygen concentration remained. The SOCdt model (RMSE = 0.94 μmol/kg, R2 = 0.994) flagged 12 Winkler samples (7.6%) as outliers. See the supplemental data docs for the summary of the Winkler-optimized calibration coefficients and model results.

Irminger Sea 10 Deployment Cruise AR76

Irminger Sea 11 Deployment Cruise AR84

Irminger Sea 12 Deployment Cruise RR2505

18:T404,This dataset contains bottle-calibrated dissolved oxygen (DO) profiles collected from Conductivity Temperature Depth (CTD) casts on turn-around cruises performed yearly to maintain the Ocean Observatories Initiative (OOI) Global Irminger Sea Array (60.46°N, 38.44°W). DO profiles were used in conjunction with oxygen bottle measurements (Winklers) to produce a post-cruise oxygen-calibrated CTD product for scientific use. Bottle-calibrated CTD salinity products were used to produce post-cruise oxygen-calibrated CTD profiles. This document contains overviews of CTD data collection and processing and post-processing oxygen sensor calibration method. Reports for each cruise include a summary of relevant cruise events, sensor performance, oxygen sensor calibration results, and issues/problems associated with oxygen data collected on each cruise. This dataset has been created for end-users that require field-calibrated oxygen data products that are currently not provided by OOI through its standard data dissemination. 19:Tc8d,NSF abstract: Ocean biology plays an important role in the Earth's carbon cycle. While most of the organic material produced by phytoplankton in the sunlit surface waters of the oceans is eaten and recycled in the surface waters, a small amount sinks to the deep ocean in what is called the "biological carbon pump." The biological pump is particularly hard to study in high latitude regions, which can be difficult to get to and challenging to work in. It is also particularly important to understand the biological pump in these parts of the ocean, where much of the world's deep ocean waters are formed. The export of carbon to deep waters can be estimated by carefully measuring the amount of excess oxygen left behind in surface waters. Oxygen in seawater can be measured very precisely using sensors deployed on moorings, floats, and gliders. These sensors can be deployed for years at a time, but their measurements must be carefully calibrated. In this project, investigators would use carefully calibrated oxygen sensors on gliders to, in turn, calibrate the oxygen sensors on a set of moorings in the high latitude North Atlantic Ocean, to study the biological carbon pump over a period of two years. The project would train several undergraduate students and a graduate student, and result in the development of educational laboratory materials that incorporate glider and mooring data from the project. The goal of this proposal is to observationally constrain the annual magnitude and seasonal timing of the biological carbon pump (determined as annual net community production; ANCP) and its influence on air-sea carbon dioxide flux by using biogeochemical sensor measurements from the Ocean Observatories Initiative (OOI) Irminger Sea Array. However, existing OOI oxygen sensor calibration suffers from both pre- and post-deployment drift, currently precluding the ability to calculate ANCP by oxygen mass balance. The investigators therefore propose to improve the accuracy and utility of OOI Irminger Sea oxygen measurements by deploying two gliders configured for air calibration of their oxygen sensors when surfacing between profiles. These air-calibrated gliders will be used to intercalibrate all 12 existing oxygen sensors on the Irminger Sea Array and produce a calibrated oxygen product incorporating data from all sensors, which will ensure sufficient accuracy to calculate ANCP. Both the annual magnitude and seasonal timing of ANCP, including upper ocean biological productivity and thermocline respiration, will be determined using an oxygen mass balance approach within a data- constrained 1D physical model. A suite of 1D model simulations including the inorganic carbon system, gas exchange, and ANCP determined from oxygen mass balance will be used, together with OOI carbon dioxide measurements, to diagnose influences of physical and biological drivers of air-sea carbon dioxide flux, improving both quantitative and mechanistic understanding of how the biological pump influences the carbon cycle. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.6:["$","$L14",null,{"dataset":{"_id":"904721","description":"$15","problem":"$16","acquisition":"

CTD casts were performed using a ship-provided SeaBird 911plus CTD and deck unit configured to measure pressure, temperature, conductivity, oxygen current, and other variables. Rosettes were equipped with primary and secondary pumped CTD sensor packages to measure pressure, temperature, and conductivity in duplicate. A SBE43 dissolved oxygen sensor was integrated into the pumped flow path of the primary CTD sensor package. During AR35-05 (Year 6; August 2019) and AR46 (Year 7; August 2020), Aanderaa oxygen optodes were also integrated into the CTD rosette due to issues with the SBE43 (2019) and circumstances interfering with routine discrete sample collection and analysis (2019 and 2020), described in greater detail under “Problems/Issues”. Sensor data were acquired by an SBE Deck Unit providing demodulated data to a personal computer running SEASAVE acquisition software. Calibrations for CTD sensors were performed by the manufacturer before the cruise.

\n","processing":"$17","bcodmoProcessing":"* Merged all files into 1 data file\r\n* Added lat/lon/time of ctd casts","title":"Bottle-calibrated dissolved oxygen profiles from yearly turn-around cruises for the Ocean Observatories Initiative (OOI) Irminger Sea Array 2014 – 2025","nickname":"Bottle-calibrated shipboard dissolved oxygen profiles","dataUrl":"","currentState":"Under revision","currentStateId":"578","validated":false,"restricted":false,"version":"1","version_date":"2026-10-06T04:00:00.000Z","abstract":"$18","citation":"Fogaren, K. E., Palevsky, H. I. (2023) Bottle-calibrated dissolved oxygen profiles from yearly turn-around cruises for the Ocean Observations Initiative (OOI) Irminger Sea Array 2014 – 2022. Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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Sampling location longitude, west is negative

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Sampling date in UTC format (yyyy-mm-ddThh:mmZ)

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In situ temperature recorded from CTD on the ITS-90 scale

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water temperature at measurement depth

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Quality control flag; all data processed by McRaven (2022) marked as 2

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Calibrated salinity (Practical Salinity Scale of 1978) calculated from conductivity recorded with CTD

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Quality control flag; all data processed by McRaven (2022) marked as 2

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Data flag. Multiple uses which are dataset dependent. Some uses: data quality, collection occurrence or success, depth indicator. See dataset documentation for specific details

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Oxygen current from the SeaBird SBE43 oxygen sensor on the CTD package processed with the SBE default hysteresis correction

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Oxygen voltage

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Quality control flag; see data documentation with Fogaren and Palevsky, 2023 and Palevsky et al. 2023 datasets.

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Data flag. Multiple uses which are dataset dependent. Some uses: data quality, collection occurrence or success, depth indicator. See dataset documentation for specific details

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Calibrated dissolved oxygen content from oxygen sensor mounted on the CTD

","units":{"_id":"","name":"umol/kg"},"type":{"_id":"1760","name":"O2_v","description":"

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Original file name

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Calibration, Response, and Hysteresis in Deep-Sea Dissolved Oxygen Measurements. Journal of Atmospheric and Oceanic Technology, 27(5), 920–931. https://doi.org/10.1175/2009jtecho693.1\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"906089","citation":"Gordon, C., Fennel, K., Richards, C., Shay, L. K., & Brewster, J. K. (2020). Can ocean community production and respiration be determined by measuring high-frequency oxygen profiles from autonomous floats? Biogeosciences, 17(15), 4119–4134. https://doi.org/10.5194/bg-17-4119-2020","relation_type":["Software"],"relation_desc":""},{"id":"884814","citation":"Jiang, L.-Q., Pierrot, D., Wanninkhof, R., Feely, R. A., Tilbrook, B., Alin, S., Barbero, L., Byrne, R. H., Carter, B. R., Dickson, A. G., Gattuso, J.-P., Greeley, D., Hoppema, M., Humphreys, M. P., Karstensen, J., Lange, N., Lauvset, S. K., Lewis, E. R., Olsen, A., … Xue, L. (2022). Best Practice Data Standards for Discrete Chemical Oceanographic Observations. Frontiers in Marine Science, 8. https://doi.org/10.3389/fmars.2021.705638\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"904887","citation":"McDougall, T.J. and P.M. Barker, (2011). Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox, 28pp., SCOR/IAPSO WG127, ISBN 978-0-646-55621-5","relation_type":["Methods"],"relation_desc":""},{"id":"906687","citation":"Palevsky, H., Clayton, S., Atamanchuk, D., Battisti, R., Batryn, J., Bourbonnais, A., Briggs, E. M., Carvalho, F., Chase, A. P., Eveleth, R., Fatland, R., Fogaren, K. E., Fram, J. P., Hartman, S. E., Le Bras, I., Manning, C. C. M., Needoba, J. A., Neely, M. B., Oliver, H., … Wingard, C. (2023). <i>OOI Biogeochemical Sensor Data Best Practices and User Guide. Version 1.1.1. [GOOS ENDORSED PRACTICE]</i>. 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Frontiers in Marine Science, 6. https://doi.org/10.3389/fmars.2019.00074\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"904891","citation":"Uchida, H. Johnson, G.,C. and McTaggart, G,. C. (2010) CTD Oxygen Sensor Calibration Procedures. In, The GO-SHIP Repeat Hydrography Manual: A Collection of Expert Reports and Guidelines. Version 1, (eds Hood, E.M., C.L. Sabine, and B.M. Sloyan), 17pp. (IOCCP Report Number 14; ICPO Publication Series Number 134). DOI: https://doi.org/10.25607/OBP-1344","relation_type":["Methods"],"relation_desc":""},{"id":"904890","citation":"Uchida, H., Kawano, T., Kaneko, I., & Fukasawa, M. (2008). In Situ Calibration of Optode-Based Oxygen Sensors. Journal of Atmospheric and Oceanic Technology, 25(12), 2271–2281. https://doi.org/10.1175/2008jtecho549.1\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"904892","citation":"Zhang, J.-Z., Berberian, G., & Wanninkhof, R. (2002). 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The dataset is related to another dataset.

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This dataset is validated by another dataset

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NOAA National Centers for Environmental Information. https://doi.org/10.25921/BFSV-YP35"},{"_id":"","name":"","url":"https://doi.org/10.25921/61kn-qv10","relation_type":"IsRelatedTo","type_desc":"The dataset is related to another dataset.","relation_desc":"","citation":"McRaven, L. (2022). Water temperature, salinity, and others taken by CTD and Niskin bottles from the research vessel Neil Armstrong, cruise AR35-05, in the North Atlantic from 08-02-2019 to 08-25-2019 (NCEI Accession 0251721) [Data set]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/61KN-QV10"},{"_id":"","name":"","url":"https://doi.org/10.25921/p8qe-me08","relation_type":"IsRelatedTo","type_desc":"The dataset is related to another dataset.","relation_desc":"","citation":"McRaven, L. (2022). Water temperature, salinity, and others taken by CTD and Niskin bottles from the research vessel Neil Armstrong, cruise AR60-01, in the North Atlantic from 08-03-2021 to 08-17-2021 (NCEI Accession 0247461) [Data set]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/P8QE-ME08"},{"_id":"","name":"","url":"","relation_type":"IsRelatedTo","type_desc":"The dataset is related to another dataset.","relation_desc":"","citation":"McRaven, Leah (in prep). 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