http://lod.bco-dmo.org/id/dataset/927300 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 2024-05-14 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Chromophoric Dissolved Organic Matter Napierian Absorption Coefficients for Open Ocean Blue Water Samples from the North Atlantic Subtropical Gyre from R/V Atlantic Explorer AE1707, AE1829, AE1820, AE1905 at Bermuda Atlantic Time Series Stations (BATS) f 2024-05-14 publication 2024-05-14 revision Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA) 2024-08-12 publication https://doi.org/10.26008/1912/bco-dmo.927300.1 Jay Brandes Skidaway Institute of Oceanography principalInvestigator William Miller University of Georgia principalInvestigator Leanne Powers Chesapeake Biological Laboratory principalInvestigator Aron Stubbins Skidaway Institute of Oceanography 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: Brandes, J., Miller, W., Powers, L., Stubbins, A. (2024) Chromophoric Dissolved Organic Matter Napierian Absorption Coefficients for Open Ocean Blue Water Samples from the North Atlantic Subtropical Gyre from R/V Atlantic Explorer AE1707, AE1829, AE1820, AE1905 at Bermuda Atlantic Time Series Stations (BATS) f. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-05-14 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.927300.1 [access date] Chromophoric dissolved organic matter (CDOM) Napierian absorption coefficients for open ocean blue water samples from the North Atlantic subtropical gyre Dataset Description: Methods and Sampling: &lt;p&gt;&lt;strong&gt;Water sampling details&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;Water samples were gravity filtered from Niskin bottles through 0.2 μm Whatman Polycap 36 AS nylon membrane cartridge filters, directly into combusted borosilicate glass bottles. Filtered sample waters were stored in the dark at 4°C until measurements. Sample waters were left in the dark at room temperature (~20°C) so they were back to room temperature before absorbance measurements.&lt;/p&gt; &lt;p&gt;These seawater samples were collected for photochemical degradation experiments, and water samples at the various BATS stations had similar optical properties, for example, similar absorbance at 325 nm. Therefore, which stations we collected samples from were largely determined by the cruise schedule, scientific tasks performed by the core BATS crew, and weather, i.e., where CTDs can be cast that allowed us ample time to directly filter water from the Niskin bottles.&lt;/p&gt; &lt;p&gt;We also wanted to compare the photoproduction of dissolved inorganic carbon (DIC) between seawater at the surface and at depth, as the deep water may have different photodegradation history and different dissolved organic carbon composition, and thus have different DIC photoproduction rates and efficiencies. Therefore, we collected water samples from the surface (1 m) and at depth (3000 m).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Measurement details&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;Absorbance (&lt;em&gt;A&lt;/em&gt;(λ)) of the water samples were measured at 250–800 nm at 1.0 nm intervals, in triplicate. May 13&lt;sup&gt;th&lt;/sup&gt;, 2017 samples were measured in 10-cm-pathlength quartz spectrophotometric cuvettes with an Agilent 8453 UV-visible spectrophotometer with ChemStation software; July 17&lt;sup&gt;th&lt;/sup&gt;, 2018 samples were measured in a World Precision Instruments UltraPath capillary cell set at 50 cm pathlength using a Maya Pro 2000 spectrophotometer with SpectraSuite software, and the rest of the samples were measured in the same UltraPath capillary cell set at 200 cm pathlength using the same Maya spectrophotometer.&lt;/p&gt; &lt;p&gt;Milli-Q water was similarly measured to use as blanks. The absorbance spectra of the sample water were first corrected by subtracting the absorbance spectra of blanks (Milli-Q water) from the absorbance spectra of the sample water; the absorbance spectra of the sample water were further corrected for potential offsets and instrument drift by subtracting the average absorbance at 690–710 nm. The corrected absorbance spectra (&lt;em&gt;A&lt;/em&gt;(λ)&lt;sub&gt;corr&lt;/sub&gt;) of the sample water generated from these corrections were converted to Napierian absorption coefficients (&lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ); m&lt;sup&gt;−1&lt;/sup&gt;; represented in this dataset as CDOM_absorption_a_g), using the following equation: &lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ)= &lt;em&gt;A&lt;/em&gt;(λ)&lt;sub&gt;corr&lt;/sub&gt; ln10/&lt;em&gt;L&lt;/em&gt;, where &lt;em&gt;L&lt;/em&gt; (m) is the pathlength.&lt;/p&gt; &lt;p&gt;The May 13&lt;sup&gt;th&lt;/sup&gt;, 2017 samples were measured in 10-cm-pathlength cuvettes with the Agilent spectrophotometer because these samples were T0 samples of a photoirradiation experiments, the water was photoirradiated in these 10-cm-pathlength cuvettes, and the absorbance were also measured in these cuvettes, which only works on the Agilent spectrophotometer, which has a 10-cm-pathlength cuvette holder.&lt;/p&gt; Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1635618 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1635618 completed Jay Brandes Skidaway Institute of Oceanography 912-598 2361 10 Ocean Science Circle Savannah GA 31411 USA Jay.Brandes@skio.uga.edu pointOfContact William Miller University of Georgia 706-542-4299 Department of Marine Sciences University of Georgia Athens GA 30602 USA bmiller@uga.edu pointOfContact Leanne Powers Chesapeake Biological Laboratory 315-470-6854 lcpowers@esf.edu pointOfContact Aron Stubbins Skidaway Institute of Oceanography 617-373-5872 102 Hurtig Building 360 Huntington Ave Boston MA 02115 USA a.stubbins@northeastern.edu pointOfContact asNeeded Dataset Version: 1 Unknown BATS_station BATS_station_Latitude BATS_station_Longitude Sample_date Sample_depth_m lambda CDOM_absorption_a_g Sample_no Maya Pro 2000 spectrophotometer Agilent 8453 UV-visible spectrophotometer theme None, User defined station latitude longitude date depth wavelength absorption coefficient sample identification featureType BCO-DMO Standard Parameters Spectrophotometer Spectrophotometer instrument BCO-DMO Standard Instruments AE1707 AE1829 AE1820 AE1905 service Deployment Activity Bermuda Atlantic Time Series Station (BATS) Hydrostation S (31.67°N, 64.17°W) place Locations 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. Transforming our understanding of DIC Photoproduction in Oceanic Waters https://osprey.bco-dmo.org/project/744569 Transforming our understanding of DIC Photoproduction in Oceanic Waters <p><em>NSF Award Abstract:</em><br /> Photoproduction describes chemical reactions which use the energy of sunlight to change the molecular structure of one product to another. This process has been shown to play an important role in the coastal ocean changing dissolved organic carbon (DOC) to dissolved inorganic carbon (DIC); however, minimal information is available on the extent to which this process takes place in the open ocean. The main obstacle to obtaining DIC production data for open ocean waters is the inability to measure the small DIC production rates against the large background of seawater DIC. Currently the most common method for high precision measurement of DIC production has unacceptable detection limits to resolve this difference. Researchers from the University of Georgia have developed MoDIE (Moderate DI13C Isotope Enrichment), a novel means of determining low levels of DIC produced in the open ocean with high precision. As part of this project, they plan to refine their MoDIE method and obtain measurements of DIC photoproduction in open ocean waters (i.e, South Atlantic Bight, North Atlantic Ocean and North Pacific Ocean subtropical gyres). Results from this work will provide improved estimates of DIC photoproduction in the open ocean which in turn will improve existing models of carbon cycling.</p> <p>The broader impacts of this project are particularly exciting. The proponents plan to create an exhibit at the University of Georgia Marine Extension public aquarium to teach the general public about ocean color and marine carbon cycling. In addition, they plan to participate in the Skidaway Institute for Oceanography ?Marine Science Day? open house to share their science with the public and incorporate results into their class curricula. One of the researchers is a first-time investigator who plans to incorporate education and training of undergraduate and graduate students in the project. Finally, undergraduate interns from underrepresented groups will be involved in the project to give them research experience and help with retention in a science discipline and career.</p> <p>Photoproduction of dissolved inorganic carbon (DIC) from dissolved organic carbon (DOC) has been shown to be a non-negligible process in the marine carbon cycle; however, it is still unclear the extent and importance of this process to the overall carbon cycle in the open ocean (blue water chemistry). The major issue causing this uncertainty is the lack of available methods with acceptable detection limits. The high background of DIC in the open ocean (2mM) makes it difficult to measure the photoproduced portion of DIC when the detection limits are high. Additionally, the current best method requires pre-stripping samples of background DIC, which could introduce unnecessary errors by over manipulating samples. This project will develop a new method called MoDIE (Moderate DI13C Isotope Enrichment) to get accurate measurements of DIC photoproduction in the open ocean. MoDIE works by enriching a sample in 13C and monitoring the dilution of DI13C under irradiation using liquid chromatography-isotope ratio mass spectrometry (LC-IRMS). By removing the need for pre-sample treatment and introducing a highly precise measurement technique, the researchers will be able to compare their techniques with published methods of photochemical DIC detection and put forth more accurate estimate of marine DIC photoproduction in the global ocean. This will greatly improve marine carbon cycle models.</p> MODIE largerWorkCitation project eng; USA oceans Bermuda Atlantic Time Series Station (BATS); Hydrostation S (31.67°N, 64.17°W) -64.73008 -64.02183 31.49222 32.15643 2017-05-13 2019-04-07 South Atlantic Bight, Bermuda BATS, Hawaii HOT 0 BCO-DMO catalogue of parameters from Chromophoric Dissolved Organic Matter Napierian Absorption Coefficients for Open Ocean Blue Water Samples from the North Atlantic Subtropical Gyre from R/V Atlantic Explorer AE1707, AE1829, AE1820, AE1905 at Bermuda Atlantic Time Series Stations (BATS) f 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/934039.rdf Name: BATS_station Units: unitless Description: <p>Name of the Bermuda Atlantic Time-series Study (BATS) station where the sample was obtained.</p> http://lod.bco-dmo.org/id/dataset-parameter/934040.rdf Name: BATS_station_Latitude Units: decimal degrees Description: <p>Latitude of the BATS station where the sample was obtained in decimal degrees; a positive value indicates a Northern coordinate.</p> http://lod.bco-dmo.org/id/dataset-parameter/934041.rdf Name: BATS_station_Longitude Units: decimal degrees Description: <p>Longitude of the BATS station where the sample was obtained in decimal degrees; a negative value indicates a Western coordinate.</p> http://lod.bco-dmo.org/id/dataset-parameter/934042.rdf Name: Sample_date Units: unitless Description: <p>Date sample was collected.</p> http://lod.bco-dmo.org/id/dataset-parameter/934043.rdf Name: Sample_depth_m Units: meters (m) Description: <p>Depth from which the sample was taken.</p> http://lod.bco-dmo.org/id/dataset-parameter/934044.rdf Name: lambda Units: nanometer (nm) Description: <p>Wavelength at which the absorbance was measured.</p> http://lod.bco-dmo.org/id/dataset-parameter/934045.rdf Name: CDOM_absorption_a_g Units: meters^(-1) Description: <p>Chromophoric dissolved organic matter (CDOM) Naperian absorption coefficients (ag)</p> http://lod.bco-dmo.org/id/dataset-parameter/934046.rdf Name: Sample_no Units: unitless Description: <p>Sample from the same location, depth and date was collected into different bottles, and for some of the samples, each bottle was measured for absorbance separately, in which case, sample numbers were given to the subsamples from each bottle. For example, 3 means this is a third bottle of the same sample taken from the same location, depth and date.</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 541601 https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/ad908809-468b-4f73-a45d-f2b0dac650d3/content download https://doi.org/10.26008/1912/bco-dmo.927300.1 download onLine dataset &lt;p&gt;&lt;strong&gt;Water sampling details&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;Water samples were gravity filtered from Niskin bottles through 0.2 μm Whatman Polycap 36 AS nylon membrane cartridge filters, directly into combusted borosilicate glass bottles. Filtered sample waters were stored in the dark at 4°C until measurements. Sample waters were left in the dark at room temperature (~20°C) so they were back to room temperature before absorbance measurements.&lt;/p&gt; &lt;p&gt;These seawater samples were collected for photochemical degradation experiments, and water samples at the various BATS stations had similar optical properties, for example, similar absorbance at 325 nm. Therefore, which stations we collected samples from were largely determined by the cruise schedule, scientific tasks performed by the core BATS crew, and weather, i.e., where CTDs can be cast that allowed us ample time to directly filter water from the Niskin bottles.&lt;/p&gt; &lt;p&gt;We also wanted to compare the photoproduction of dissolved inorganic carbon (DIC) between seawater at the surface and at depth, as the deep water may have different photodegradation history and different dissolved organic carbon composition, and thus have different DIC photoproduction rates and efficiencies. Therefore, we collected water samples from the surface (1 m) and at depth (3000 m).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Measurement details&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;Absorbance (&lt;em&gt;A&lt;/em&gt;(λ)) of the water samples were measured at 250–800 nm at 1.0 nm intervals, in triplicate. May 13&lt;sup&gt;th&lt;/sup&gt;, 2017 samples were measured in 10-cm-pathlength quartz spectrophotometric cuvettes with an Agilent 8453 UV-visible spectrophotometer with ChemStation software; July 17&lt;sup&gt;th&lt;/sup&gt;, 2018 samples were measured in a World Precision Instruments UltraPath capillary cell set at 50 cm pathlength using a Maya Pro 2000 spectrophotometer with SpectraSuite software, and the rest of the samples were measured in the same UltraPath capillary cell set at 200 cm pathlength using the same Maya spectrophotometer.&lt;/p&gt; &lt;p&gt;Milli-Q water was similarly measured to use as blanks. The absorbance spectra of the sample water were first corrected by subtracting the absorbance spectra of blanks (Milli-Q water) from the absorbance spectra of the sample water; the absorbance spectra of the sample water were further corrected for potential offsets and instrument drift by subtracting the average absorbance at 690–710 nm. The corrected absorbance spectra (&lt;em&gt;A&lt;/em&gt;(λ)&lt;sub&gt;corr&lt;/sub&gt;) of the sample water generated from these corrections were converted to Napierian absorption coefficients (&lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ); m&lt;sup&gt;−1&lt;/sup&gt;; represented in this dataset as CDOM_absorption_a_g), using the following equation: &lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ)= &lt;em&gt;A&lt;/em&gt;(λ)&lt;sub&gt;corr&lt;/sub&gt; ln10/&lt;em&gt;L&lt;/em&gt;, where &lt;em&gt;L&lt;/em&gt; (m) is the pathlength.&lt;/p&gt; &lt;p&gt;The May 13&lt;sup&gt;th&lt;/sup&gt;, 2017 samples were measured in 10-cm-pathlength cuvettes with the Agilent spectrophotometer because these samples were T0 samples of a photoirradiation experiments, the water was photoirradiated in these 10-cm-pathlength cuvettes, and the absorbance were also measured in these cuvettes, which only works on the Agilent spectrophotometer, which has a 10-cm-pathlength cuvette holder.&lt;/p&gt; Specified by the Principal Investigator(s) &lt;p&gt;&lt;strong&gt;Data Corrections and Conversions&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;The average absorbance spectra of blanks were subtracted from the absorbance spectra of the sample water.&lt;/p&gt; &lt;p&gt;Absorbance spectra were further corrected for potential offsets and instrument drift by subtracting the average absorbance at 690–710 nm.&lt;/p&gt; &lt;p&gt;&lt;em&gt;A&lt;/em&gt;(λ) was converted to Napierian absorption coefficients (&lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ); m&lt;sup&gt;−1&lt;/sup&gt;), using the following equation:&amp;nbsp;&lt;em&gt;a&lt;/em&gt;&lt;sub&gt;g&lt;/sub&gt;(λ)=&amp;nbsp;&lt;em&gt;A&lt;/em&gt;(λ) ln10/&lt;em&gt;L&lt;/em&gt;, where&amp;nbsp;&lt;em&gt;L&lt;/em&gt;&amp;nbsp;(m) is the pathlength.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Data Processing Software&lt;/strong&gt;&lt;/p&gt; &lt;ul&gt; &lt;li&gt;Importing and correcting absorbance measurements (A(λ))&lt;/li&gt; &lt;li&gt;Converting A(λ) to Napierian absorption coefficients (ag(λ))&lt;/li&gt; &lt;li&gt;R-3.3.3, R-3.4.4, R-3.5.3, R-3.6.2, R-3.6.3, R-4.2.1&lt;/li&gt; &lt;li&gt;Package ‘stringr’: &lt;ul&gt; &lt;li&gt;Wickham H (2023). _stringr: Simple, Consistent Wrappers for Common String Operations_. R package version 1.5.1, &amp;lt;https://CRAN.R-project.org/package=stringr&amp;gt;.&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; Specified by the Principal Investigator(s) - Latitude and longitude values were joined to the dataset for BATS station sites 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 Maya Pro 2000 spectrophotometer Maya Pro 2000 spectrophotometer PI Supplied Instrument Name: Maya Pro 2000 spectrophotometer PI Supplied Instrument Description:Chromophoric dissolved organic matter absorbance measurements were made from samples taken from July 17, 2018 were analysed SpectraSuite software using a Maya Pro 2000 spectrophotometer with SpectraSuite software. Instrument Name: Spectrophotometer Instrument Short Name:Spectrophotometer Instrument Description: An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/ Agilent 8453 UV-visible spectrophotometer Agilent 8453 UV-visible spectrophotometer PI Supplied Instrument Name: Agilent 8453 UV-visible spectrophotometer PI Supplied Instrument Description:Chromophoric dissolved organic matter absorbance measurements were made from samples taken May 13, 2017 with an Agilent 8453 UV-visible spectrophotometer with ChemStation software.      Instrument Name: Spectrophotometer Instrument Short Name:Spectrophotometer Instrument Description: An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/ Cruise: AE1707 AE1707 R/V Atlantic Explorer Community Standard Description International Council for the Exploration of the Sea R/V Atlantic Explorer vessel AE1707 Matthew Enright Cruise: AE1829 AE1829 R/V Atlantic Explorer Community Standard Description International Council for the Exploration of the Sea R/V Atlantic Explorer vessel AE1829 Paul J. Lethaby Cruise: AE1820 AE1820 R/V Atlantic Explorer Community Standard Description International Council for the Exploration of the Sea R/V Atlantic Explorer vessel Cruise: AE1905 AE1905 R/V Atlantic Explorer Community Standard Description International Council for the Exploration of the Sea R/V Atlantic Explorer vessel AE1905 Michael W. Lomas Bigelow Laboratory for Ocean Sciences R/V Atlantic Explorer Community Standard Description International Council for the Exploration of the Sea R/V Atlantic Explorer vessel