POM concentrations for carbon, nitrogen, and phosphorus from GO-SHIP Line I07N RB1803 in the Western Indian Ocean from 2018-04 to 2018-06 (Ocean Stoichiometry Project) (NCEI Accession 0278485)
This dataset contains chemical data collected on NOAA Ship Ronald H. Brown during cruise RB1803 from 2018-04-25 to 2018-06-04. These data include particulate organic Carbon (POC) and particulate organic nitrogen. The instruments used to collect these data include Elemental Analyzer and Spectrophotometer. These data were collected by Adam Martiny, Allison R. Moreno, Catherine Garcia, and Tatsuro Tanioka of University of California-Irvine as part of the "Convergence: RAISE: Linking the adaptive dynamics of plankton with emergent global ocean biogeochemistry (Ocean Stoichiometry)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2022-10-11.
The following is the text of the dataset description provided by BCO-DMO:
POM concentrations for carbon, nitrogen, and phosphorus from GO-SHIP Line I07N in 2018
Dataset Description:
The operating area was in the western Indian Ocean. The I07N section runs across the Madagascar and Mascarene Basins in the south, crosses the Amirante Trench, and after the Seychelles Bank it crosses the Somalia Basin, Carlsberg Ridge, and the Arabian Sea in the north.
The following is the text of the dataset description provided by BCO-DMO:
POM concentrations for carbon, nitrogen, and phosphorus from GO-SHIP Line I07N in 2018
Dataset Description:
The operating area was in the western Indian Ocean. The I07N section runs across the Madagascar and Mascarene Basins in the south, crosses the Amirante Trench, and after the Seychelles Bank it crosses the Somalia Basin, Carlsberg Ridge, and the Arabian Sea in the north.
Dataset Citation
- Cite as: Martiny, Adam; Garcia, Catherine; Moreno, Allison R.; Tanioka, Tatsuro (2023). POM concentrations for carbon, nitrogen, and phosphorus from GO-SHIP Line I07N RB1803 in the Western Indian Ocean from 2018-04 to 2018-06 (Ocean Stoichiometry Project) (NCEI Accession 0278485). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0278485. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0278485
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NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2018-04-25 to 2018-06-04 |
Spatial Bounding Box Coordinates |
West: 40.0075
East: 69.4832
South: -30.0118
North: 17.9987
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Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Acquisition Description: POM sample collection: General equipment preparation in the lab before shipment included an HCl bath (1.0 M HCl overnight) and milli-Q rinse for the 8 L carboys, tubing, and filter holders. Additionally, the carboys were autoclaved. The 25 mm, 0.7 μm GF/F filters and aluminum foil used to wrap the filters were combusted (500 °C for 5 hours) in aluminum foil packets to remove any traces of carbon present. The forceps that came in contact with the samples were wiped with 70% ethanol before and between uses. Seawater for the POM samples was collected from the onboard flow through the underway system. Before sampling, the carboys used were rinsed twice with the pre-filtered underway seawater. POM samples smaller than < 30µmwere collected hourly and at noon samples were collected in triplicate. 30 μm nylon mesh pre-filter was attached to the underway outlet for all standard samples to separate and remove POM samples larger than > 30µm (e.g., large plankton and particulates). After filtration, all POP triplicates were rinsed with approximately 2-5 mL of a 0.17 M Na2SO4 solution to remove dissolved phosphorus. POM samples larger than > 30µm were collected on nitex mesh for ~1 hour. The flow rate was measured by measuring volume in an 8L carboy over a duration of several minutes. Mesh was rinsed into a container with filter seawater and then split onto duplicate GF/F samples for POC/PON. All POM samples were folded in half with the top sides toward each other, sealed inside pieces of precombusted aluminum foil, and stored in a -20 °C freezer until analysis. POP assay: The POP data were obtained using an ash/hydrolysis method and comparing the samples to a set of standard phosphorus concentrations (Lomas et al., 2010, Biogeosciences , 7 (2), 695-710, https://doi.org/10.5194/bg-7-695-2010). The sample filters were unfolded and placed face up into acid-bathed and combusted scintillation vials. Along with each set of samples, 10 different volumes (ranging 0 - 0.5 mL) of 0.1 M KH2PO4 solution were added to scintillation vials. 2 mL of a 0.017 M MgSO4 drying solution was added to each scintillation vial and then all vials were placed into an 80-90 °C oven overnight to dry. After drying, the vials were heated at 500 °C for 2 hours, then left to cool before adding 5 mL of 0.2 M HCl to each vial and being returned to the 80-90 °C oven for 30 minutes after being brought up to temperature. The solutions were then transferred to 15 mL glass centrifuge tubes (prepared in the same way as the scintillation vials). The sample vials were rinsed with 5 mL of milli-Q each, which was also added to the centrifuge tubes. 1 mL of a mixed reagent containing 2:5:1:2 parts Ammonium Molybdate ((NH4)6Mo7O24), 5.0 N H2SO4, Potassium Antimonyl Tartrate (C8H4K2O12Sb2), and Ascorbic Acid (C6H8O6) respectively was added to each centrifuge tube in 30-second intervals. Each of the sample tubes was centrifuged to isolate any glass fibers that could interfere with the absorbance reading. Lastly, after allowing the mixed reagent to react for exactly 30 min, the standards and samples were analyzed in 30-second intervals in a spectrophotometer at an 885 nm wavelength using a blank of ~0.1 M HCl solution and rinsing the cuvette with the blank solution between measurements. POC/PON assay: POC and PON measurements were analyzed both in-lab at UCI. The preparation for all samples was the same; the samples were each removed from their foil packets and placed into acid-bathed and combusted scintillation vials and dried in a 55 °C oven overnight. The scintillation vials were then placed in a desiccator containing a beaker of 12 M HCl overnight before being dried at 55 °C at least overnight once more. Samples sent to UCSB were then capped and shipped to the lab. Samples analyzed at UCI were packed into tin packets alongside Atropine (C17H23NO3) standards (ranging from 0.2-1.5 mg) and measured using a Flash EA elemental analyzer. Associated GO-SHIP I07N underway and bottle datasets can be found on the CLIVAR and Carbon Hydrographic Data Office Section I07N homepage: https://cchdo.ucsd.edu/cruise/33RO20180423. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Last Modified: 2024-05-31T15:15:28Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov