Nitrate+nitrite and nitrate-only d15N from R/V S.A. Agulhas II cruises VOY016 and VOY019 in the Southern Ocean south of Africa during 2015-2016 (NCEI Accession 0277949)
This dataset contains biological, chemical, optical, and physical data collected on R/V S.A. Agulhas II during cruises VOY016 and VOY019 in the Indian Ocean and South Atlantic Ocean from 2015-07-26 to 2016-05-09. These data include Nitrate, dN15_NO3, density, depth, dissolved Oxygen, fluorescence, mixed layer depth, nitrate plus nitrite, salinity calculated from CTD primary sensors, water pressure, and water temperature. The instruments used to collect these data include CTD Sea-Bird, Isotope-ratio Mass Spectrometer, and Niskin bottle. These data were collected by Daniel M. Sigman of Princeton University as part of the "Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study (N Isotopes Foraminifera)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-03-13.
The following is the text of the dataset description provided by BCO-DMO:
Nitrate+nitrite and nitrate-only δ15N from the Southern Ocean south of Africa
Dataset Description:
Nitrate+nitrite and nitrate-only δ15N from the Southern Ocean south of Africa. The dataset includes hydrocast (depth-profile) and underway (surface; intake at 7 m depth) data. The former is accompanied by hydrographic data obtained during the CTD cast.
The following is the text of the dataset description provided by BCO-DMO:
Nitrate+nitrite and nitrate-only δ15N from the Southern Ocean south of Africa
Dataset Description:
Nitrate+nitrite and nitrate-only δ15N from the Southern Ocean south of Africa. The dataset includes hydrocast (depth-profile) and underway (surface; intake at 7 m depth) data. The former is accompanied by hydrographic data obtained during the CTD cast.
Dataset Citation
- Cite as: Sigman, Daniel M. (2023). Nitrate+nitrite and nitrate-only d15N from R/V S.A. Agulhas II cruises VOY016 and VOY019 in the Southern Ocean south of Africa during 2015-2016 (NCEI Accession 0277949). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0277949. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0277949
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2015-07-26 to 2016-05-09 |
Spatial Bounding Box Coordinates |
West: 0
East: 38.499
South: -54
North: -39.411
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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: Seawater samples were collected aboard the R/V S.A. Agulhas II (from CTD Niskin bottles and the underway intake) and immediately frozen at −20°C until analysis. Hydrographic data for each profile station were acquired from a conductivity-temperature depth (CTD) sensor mounted on the Niskin bottle rosette. An aliquot of each seawater sample was treated with sulfamic acid to remove nitrite (Granger & Sigman, 2009). Both nitrate+nitrite and nitrate-only samples were measured for concentration by chemiluminescence (Braman & Hendrix, 1989) and isotope composition using the denitrifier method (Sigman et al., 2001). Briefly, sample nitrate or nitrate+nitrite is converted to N₂O gas by denitrifying bacteria and measured for N isotope composition by GC-IRMS with an on-line N₂O extraction and purification system (Sigman et al., 2001; Casciotti et al., 2002; Weigand et al., 2016). The pooled standard deviations (1σ) of replicate denitrifier measurements was 0.09‰ for nitrate+nitrite δ¹⁵N and 0.06‰ for nitrate-only δ¹⁵N. Hydrographic profiles were acquired by a Sea-Bird conductivity-temperature depth sensor during each cast. The isotopic composition of N₂O was measured at Princeton University by GC-IRMS using a Thermo MAT 253 mass spectrometer with a purpose-built on-line N₂O extraction and purification system. See methods section of Smart et al. (2020) for more detail. |
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: 2024-05-31T18:50:46Z
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