http://lod.bco-dmo.org/id/dataset/988873 eng; USA utf8 dataset Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 2025-11-14 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Continuously monitored water quality measurements from five salt marsh ponds in New Jersey, USA from Apr 2023 to Jun 2024 2026-03-18 publication 2026-03-18 revision Woods Hole Oceanographic Institution (WHOI BCO-DMO) 2026-03-20 publication https://doi.org/10.26008/1912/bco-dmo.988873.1 Hilary I. Palevsky Boston College principalInvestigator Emily J. Chua Boston College principalInvestigator Kristen E. Fogaren Boston College principalInvestigator Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. publisher Cite this dataset as: Supino, J., Fogaren, K. E., Chua, E. J., Palevsky, H. I. (2026) Continuously monitored water quality measurements from five salt marsh ponds in New Jersey, USA from Apr 2023 to Jun 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-03-18 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.988873.1 [access date] Salt pond monitoring Dataset Description: Methods and Sampling: &lt;p&gt;Continuous water-quality monitoring was conducted in five salt marsh ponds (mean water depths &amp;lt;1m) located within SMIIL from April 2023–June 2024. Water quality sensors were mounted approximately 15 cm above the bottom of the pond to a fixed pole. Each pond was equipped with internally logging HOBO sensors (Onset Computer Corp.) that measured pressure, conductivity/salinity, dissolved oxygen (DO), and pH every 10 minutes. Temperature was also recorded by each of the sensors, and temperature data provided here reflects the median of the four sensors in each pond. An additional HOBO pressure sensor, deployed at a central location within SMIIL, recorded air temperature and barometric pressure. During maintenance trips every 4-16 weeks, sensors were retrieved, cleaned, recalibrated (DO and pH only) and redeployed in each pond for a total of five deployments. Data files from each sensor were downloaded during each maintenance visit. Discrete surface-water samples for DO, dissolved inorganic carbon (DIC), and total alkalinity (TA) measurements were also collected during maintenance visits and used to validate DO and pH time series data (see discrete sample dataset, also in this project).&lt;br /&gt; &amp;nbsp;&lt;br /&gt; HOBO DO loggers were calibrated every service trip before deployment using two points: a 100% saturation open air point and a 0% point using sodium sulfite dissolved in deionized water. HOBO pH loggers were calibrated every service trip before deployment using three-point calibration standards: pH 4.0, pH 7.0, and pH 10.0.&lt;/p&gt; Funding provided by U.S. Army Engineer Research and Development Center (ERDC) Award Number: W912HZ2020061–RA3 completed Hilary I. Palevsky Boston College 617-552-4936 Boston College Dept of Earth and Environmental Sciences 140 Commonwealth Ave Chestnut Hill MA 02467 USA palevsky@bc.edu pointOfContact Emily J. Chua Boston College emily.chua@bc.edu pointOfContact Kristen E. Fogaren Boston College Boston College Department of Earth and Environmental Sciences kristen.fogaren@bc.edu pointOfContact asNeeded Dataset Version: 1 Unknown datetime_utc site lat lon depth salinity temperature DOconc DOeqsat DOsat pH Onset HOBO pH and Temperature Data Logger (MX2501) Onset HOBO Salt Water Conductivity/Salinity Data Logger (U24-002-C) Onset HOBO Water Level Data Logger (U20-L-01) Onset HOBO Dissolved Oxygen Data Logger (U26-001) theme None, User defined ISO_DateTime_UTC site latitude longitude depth salinity water temperature at measurement depth dissolved Oxygen No BCO-DMO term Dissolved oxygen (percent) pH featureType BCO-DMO Standard Parameters Onset HOBO pH and Temperature data logger MX2501 Onset HOBO Saltwater Conductivity/Salinity data logger U24-002-C Onset HOBO U20L water level logger series Onset HOBO U26-001 Dissolved Oxygen Data Logger instrument BCO-DMO Standard Instruments otherRestrictions otherRestrictions Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use. Sediment transport and water quality in watersheds and coastlines of the United States https://osprey.bco-dmo.org/project/962228 Sediment transport and water quality in watersheds and coastlines of the United States <p>Salt marshes are highly productive, dynamic coastal environments that experience large fluctuations in biogeochemical parameters such as dissolved oxygen and pH in response to both natural forcings and anthropogenic impacts. At present, we have a limited understanding of the magnitude of biogeochemical variability in coastal habitats, hindering our ability to predict how they will respond in the future to episodic events and long-term change. This incomplete picture owes to a lack of sustained water quality measurements in coastal and estuarine systems worldwide.</p> <p>This project investigates biogeochemical cycling in the Seven Mile Island Innovation Laboratory (SMIIL), a network of tidal marshes and channels in coastal New Jersey that is a site of historic and contemporary dredging and a testbed for marsh restoration techniques such as beneficial use of dredged sediment. It leverages multiple data sets of continuous, high-frequency (10-minute) measurements of physical and biogeochemical parameters, including water depth, temperature, salinity, dissolved oxygen, pH, chlorophyll a, and turbidity, as well as precipitation, wind speed, wind direction, temperature, relative humidity, and atmospheric pressure data. Two long-term biogeochemical sensor data sets, comprising a three-year time series at three sites in the main marsh channel (from June 2021–June 2024) and 1-2 year time series at six distinct salt ponds (August 2022–June 2024), were collected. Additionally, short-term (~months long) dredging and sediment placement monitoring data were collected at five different locations in 2022 and 2023. Data collection was designed to capture a variety of natural (diel, tidal, seasonal, storm-related) and human-created (sediment dredging and placement) conditions. Factory-calibrated biogeochemical sensors were field calibrated and maintained every 4 to 12 weeks. Discrete samples for dissolved oxygen, total alkalinity, and dissolved inorganic carbon were collected at the start and end of each sensor deployment for additional sensor calibration and validation. Altogether, our high-quality, multiyear dataset provides critical insights into the inherent variability of biogeochemical conditions in temperate salt marshes on diel and seasonal timescales, as well as how they may respond to transient events (e.g., storms, dredging activities) and over the longer term.</p> SMIIL Water Quality largerWorkCitation project eng; USA oceans -74.801792 -74.749481 39.043803 39.088022 2023-04-19 2024-06-03 Coastal New Jersey (Seven Mile Island Innovation Lab) 0 BCO-DMO catalogue of parameters from Continuously monitored water quality measurements from five salt marsh ponds in New Jersey, USA from Apr 2023 to Jun 2024 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact http://lod.bco-dmo.org/id/dataset-parameter/989144.rdf Name: datetime_utc Units: unitless Description: <p>Sampling date and time in UTC</p> http://lod.bco-dmo.org/id/dataset-parameter/989145.rdf Name: site Units: unitless Description: <p>Site of sampling (Drum, Long Reach, Ring East, Shark, or White)</p> http://lod.bco-dmo.org/id/dataset-parameter/989146.rdf Name: lat Units: decimal degrees Description: <p>Sampling location latitude, North is positive</p> http://lod.bco-dmo.org/id/dataset-parameter/989147.rdf Name: lon Units: decimal degrees Description: <p>Sampling location longitude, West is negative</p> http://lod.bco-dmo.org/id/dataset-parameter/989148.rdf Name: depth Units: meters Description: <p>Sampling depth</p> http://lod.bco-dmo.org/id/dataset-parameter/989149.rdf Name: salinity Units: unitless Description: <p>Salinity using the TSS-78 scale</p> http://lod.bco-dmo.org/id/dataset-parameter/989150.rdf Name: temperature Units: degrees Celsius Description: <p>Temperature</p> http://lod.bco-dmo.org/id/dataset-parameter/989151.rdf Name: DOconc Units: μmol/kg Description: <p>Dissolved oxygen concentration</p> http://lod.bco-dmo.org/id/dataset-parameter/989152.rdf Name: DOeqsat Units: μmol/kg Description: <p>Equilibrium dissolved oxygen concentration, as calculated using the final quality-controlled temperature and salinity (Garcia &amp; Gordon, 1992)</p> http://lod.bco-dmo.org/id/dataset-parameter/989153.rdf Name: DOsat Units: percent Description: <p>Dissolved oxygen percent saturation, calculated from the cleaned DO concentration, salinity, and temperature data</p> http://lod.bco-dmo.org/id/dataset-parameter/989154.rdf Name: pH Units: unitless Description: <p>pH (total scale)</p> GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact https://doi.org/10.26008/1912/bco-dmo.988873.1 download onLine dataset &lt;p&gt;Continuous water-quality monitoring was conducted in five salt marsh ponds (mean water depths &amp;lt;1m) located within SMIIL from April 2023–June 2024. Water quality sensors were mounted approximately 15 cm above the bottom of the pond to a fixed pole. Each pond was equipped with internally logging HOBO sensors (Onset Computer Corp.) that measured pressure, conductivity/salinity, dissolved oxygen (DO), and pH every 10 minutes. Temperature was also recorded by each of the sensors, and temperature data provided here reflects the median of the four sensors in each pond. An additional HOBO pressure sensor, deployed at a central location within SMIIL, recorded air temperature and barometric pressure. During maintenance trips every 4-16 weeks, sensors were retrieved, cleaned, recalibrated (DO and pH only) and redeployed in each pond for a total of five deployments. Data files from each sensor were downloaded during each maintenance visit. Discrete surface-water samples for DO, dissolved inorganic carbon (DIC), and total alkalinity (TA) measurements were also collected during maintenance visits and used to validate DO and pH time series data (see discrete sample dataset, also in this project).&lt;br /&gt; &amp;nbsp;&lt;br /&gt; HOBO DO loggers were calibrated every service trip before deployment using two points: a 100% saturation open air point and a 0% point using sodium sulfite dissolved in deionized water. HOBO pH loggers were calibrated every service trip before deployment using three-point calibration standards: pH 4.0, pH 7.0, and pH 10.0.&lt;/p&gt; Specified by the Principal Investigator(s) &lt;p&gt;All data were processed through a combination of manual and automated quality checks. Quality control procedures were based on protocols adapted from the U.S. Integrated Ocean Observing System (IOOS) Quality Assurance/Quality Control of Real-Time Oceanographic Data (QARTOD) recommendations (IOOS, 2018; Palevsky et al., 2024; Chua et al. (2025) related dataset in this project).&lt;/p&gt; &lt;p&gt;First, all deployments were merged into a continuous time series and retimed to 10-minute intervals. Depth was calculated using pressure measurements in the ponds and barometric pressure from a central location at SMIIL using the Gibbs Seawater Toolbox (GSW, McDougall and Barker 2011). Time series from each pond were manually inspected with “human-in-the-loop” (HITL) annotations to identify and document suspect depth data. Points flagged for review were compared to service trip logs in order to diagnose the reason for flagged data (e.g., periods where sensors were not fully submerged in seawater). The time periods for flagged depth data that were associated with service trips were then removed for all parameters.&lt;br /&gt; &amp;nbsp;&lt;br /&gt; In each pond, each individual HOBO sensor measured temperature in addition to pressure, conductivity, pH, or oxygen. The temperature time series presented for each pond is the median temperature collected by the four sensors in each pond. We conducted gross range tests on the median temperature, calculated salinity, pH, and oxygen to ensure data fell within reasonable ranges. Ranges for each parameter are kept consistent across all ponds. For the time points flagged by temperature or salinity gross range tests in each pond, the corresponding oxygen and pH values were flagged and removed from the pond’s dataset.&lt;br /&gt; &amp;nbsp;&lt;br /&gt; Salinity (unitless) was calculated from conductivity and temperature using the Gibbs Seawater Toolbox. Salinity data was observed to be “spikier” than other parameters with acute changes in salinity occurring without the expected corresponding changes in temperature. As such we identified these spikes using the “isoutlier” function in MATLAB that determines outliers as a point that is over three standard deviations from the moving mean calculated using a three hour window. If the identified “spikes” resulted from points greater than 0.05 salinity units from the moving mean then the point was removed. Time points flagged as salinity “spikes” were removed from the corresponding oxygen and pH time series.&lt;br /&gt; &amp;nbsp;&lt;br /&gt; Onset HOBO Conductivity data loggers are not capable of internal calibration, so data were compared with nearby channel station salinity, water level, and temperature data (Gull Platform, ~1 km away, see Chua et al. related dataset) for salinity calibration and validation. During certain high tides, water from the channel rises above the marsh platform and enters the ponds. During these high tides, pond depths were observed to increase and decrease tidally, and pond temperatures were similar to that in the channel, consistent with pond flushing. However, the preliminary salinity data from the HOBO loggers in the ponds were offset from the channel salinity data during this period, indicating offsets in the HOBO Conductivity measurements. In order to correct for these calibration offsets, we identified high tide periods when channel water entered the ponds based on water depth and temperature data and determined calibration offsets for the pond salinity measurements by correcting the pond salinity to match that of the channel during these high tide periods. Salinity data reported here for the Ring, Shark, and Long Reach ponds were corrected using this approach. For the final two ponds (White and Drum), the HOBO Conductivity sensors deployed at these sites malfunctioned and did not report any usable data. Salinity data reported for White and Drum ponds are the median calibrated salinity values from the three ponds that did not experience sensor malfunctions.&lt;br /&gt; &amp;nbsp;&lt;br /&gt; DO concentrations (μmol/L) that passed quality control procedures were adjusted for temperature, salinity (calibrated as above) and pressure using the Aanderaa Data Instruments (2017) compensation equations to provide temperature, salinity and pressure compensated oxygen concentrations (μmol/L). We calculated the density using the GSW Toolbox with the calibrated salinity, temperature and depth variables to provide DO concentrations in μmol/kg. DO equilibrium saturation (DOeqsat) was calculated using the GSW Toolbox according to Garcia &amp;amp; Gordon (1992). DO percent saturation (DOsat) was then calculated as the ratio of the observed DO concentration (DOconc) to the equilibrium saturation concentration (DOeqsat), and multiplied by 100.&lt;br /&gt; &amp;nbsp;&lt;br /&gt; Calibration accuracy for both DO and pH was validated based on discrete samples collected at the beginning and end of each deployment (see related dataset). For comparison, pH, DIC, and TA data were converted to hydrogen ion space ([H+]) using the CO2SYSv3 MATLAB package (Lewis &amp;amp; Wallace, 1998; Sharp, 2023; Van Heuven et al., 2011).&amp;nbsp;&lt;/p&gt; Specified by the Principal Investigator(s) - Loaded data from &quot;all_data.csv&quot; in CSV format, using row 1 as headers, treating empty strings, &quot;nd&quot;, and &quot;NaN&quot; as missing values - Converted field &quot;datetime_utc&quot; from format &quot;%d-%b-%Y %H:%M:%S&quot; (UTC) to ISO 8601 format &quot;%Y-%m-%dT%H:%M:%SZ&quot; (UTC), output as datetime type - Output final dataset to &quot;988873_v1_salt_pond_monitoring.csv&quot; Specified by BCO-DMO Data Managers asNeeded 7.x-1.1 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact Onset HOBO pH and Temperature Data Logger (MX2501) Onset HOBO pH and Temperature Data Logger (MX2501) PI Supplied Instrument Name: Onset HOBO pH and Temperature Data Logger (MX2501) PI Supplied Instrument Description:HOBO pH and Temperature Data Loggers measured the pH in the pond seawater. Instrument Name: Onset HOBO pH and Temperature data logger MX2501 Instrument Short Name:HOBO MX2501 Instrument Description: The HOBO MX2501 pH and Temperature Data Logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers, and oceans. Leveraging Bluetooth Low Energy® (BLE) technology, the MX2501 pH Logger communicates wirelessly with the free HOBOconnect app and your mobile device or Windows computer, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOconnect app makes an otherwise complicated process easier to follow. This affordable and compact logger dramatically cuts the time and effort needed to collect field data, while also offering higher resolution data. (NOTE: pH electrodes should always be stored in storage solution when not deployed). Onset HOBO Salt Water Conductivity/Salinity Data Logger (U24-002-C) Onset HOBO Salt Water Conductivity/Salinity Data Logger (U24-002-C) PI Supplied Instrument Name: Onset HOBO Salt Water Conductivity/Salinity Data Logger (U24-002-C) PI Supplied Instrument Description:HOBO Salt Water Conductivity/Salinity Data Loggers measured the electrical conductivity of the seawater in the pond. Instrument Name: Onset HOBO Saltwater Conductivity/Salinity data logger U24-002-C Instrument Short Name:Onset HOBO U24-002-C conductivity logger Instrument Description: HOBO Salt Water Conductivity/Salinity Data Logger is a cost-effective data logger for measuring cost-effective data logger for measuring salinity, conductivity, and temperature in saltwater environments with relatively small changes in salinity (±5,000 μS/cm) such as saltwater bays, or to detect salinity events such as upwelling, rainstorm, and discharge events. Onset HOBO Water Level Data Logger (U20-L-01) Onset HOBO Water Level Data Logger (U20-L-01) PI Supplied Instrument Name: Onset HOBO Water Level Data Logger (U20-L-01) PI Supplied Instrument Description:HOBO Water Level Data Loggers measure pressure. Water level (depth) was calculated by comparing the sensor pressure to an additional pressure sensor not submerged in water.  Instrument Name: Onset HOBO U20L water level logger series Instrument Short Name:HOBO U20L Instrument Description: The HOBO U20L is designed for monitoring changing water levels in a variety of applications including tidal areas, streams, lakes, wetlands, and groundwater. It outputs pressure, water level, and temperature data. The instrument can record samples, sensor measurements at each logging interval, and events data, occurrences such as a bad battery or host connected. The samples are recorded as absolute pressure values, which are later converted to water level readings using software. Absolute pressure is atmospheric pressure plus water head. The deployment of an additional HOBO U20L at the surface can be used to compensate for barometric pressure changes. Each instrument is individually calibrated. They require a coupler and optic base station or HOBO waterproof shuttle to connect to a computer. The instrument is operated with a 3.6 V lithium battery. This series contains 3 models, U20L-01, U20L-02, and U20L-04, with different operation ranges, calibrated ranges, and burst pressures. The pressure sensor is temperature compensated between 0 and 40 degrees Celsius (C), and calibrated between 69 and a maximum of 400 kPa (depending on the model). Its accuracy is within 0.3 % of the full scale for absolute pressure, and 0.1 % FS for water level readings. The temperature sensor operates between -20 and 50 degrees C, with an accuracy of 0.44 deg C, and a resolution of 0.1 deg C. The drift is 0.1 deg C per year. Onset HOBO Dissolved Oxygen Data Logger (U26-001) Onset HOBO Dissolved Oxygen Data Logger (U26-001) PI Supplied Instrument Name: Onset HOBO Dissolved Oxygen Data Logger (U26-001) PI Supplied Instrument Description:HOBO Dissolved Oxygen Data Loggers measured the concentration of oxygen in the pond seawater. Instrument Name: Onset HOBO U26-001 Dissolved Oxygen Data Logger Instrument Short Name:HOBO DO logger (U26-001) Instrument Description: A dissolved oxygen sensor, temperature sensor, and integrated data logger. The HOBO U26-001 can be used in freshwater and saltwater conditions, and outputs dissolved oxygen (mg/L) and temperature (degC) measurements.