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OAS accession Detail for 0278106
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| accessions_id: | 0278106 | archive |
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| Title: | Surface nanomolar Phosphate, Nitrate, and Nitrite concentrations from R/V Knorr cruise KN204-01 in the Subtropical northern Atlantic Ocean in 2011 (U.S. GEOTRACES NAT project) (NCEI Accession 0278106) |
| Abstract: | This dataset contains chemical data collected on R/V Knorr during cruise KN204-01 in the North Atlantic Ocean from 2011-11-06 to 2011-12-09. These data include Nitrate, Nitrite, and reactive phosphorus (PO4). The instruments used to collect these data include GeoFish Towed near-Surface Sampler. These data were collected by Gregory A. Cutter of Old Dominion University as part of the "U.S. GEOTRACES North Atlantic Transect (U.S. GEOTRACES NAT)" project and "U.S. GEOTRACES (U.S. GEOTRACES)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-05-11. The following is the text of the dataset description provided by BCO-DMO: Nanomolar concentrations of PO4, NO3, NO2 (surface) Dataset Description: Acquisition Description: Filtered (0.4 micromole) water samples from the Geotraces surface tow-fish and water from the upper 200 m water column (GEOTRACES Carousel/GoFlo system) were analyzed on an Astoria Pacific 300 series gas-segmented continuous flow nutrient auto-analyzer modified with 200 cm liquid waveguide capillary cells (LWCC; World Precision Instruments). Nitrate was reduced to nitrite using a Cd-column, then determined spectrophotometrically following formation of a highly colored dye, but slightly modified for use with a liquid core waveguide (see references). Nitrite is measured separately without the Cd column and then subtracted from the combined nitrate+nitrite sample. The molybdenum blue method modified for use with liquid core wave guide was used for phosphate (references below). Recovery for phosphate measurements for LWCC relative to the MAGIC method is 100 ± 15 % for concentrations below 100 nmol/L. The relative standard deviation for nine measurements of 5 nmol/L phosphate was 1.6 %. The relative standard deviation for nine measurements of 60 nM phosphate was 0.9 %. LWCC detection limit (3 x σ of blank) for phosphate was 0.5 nmol/L, 1.5 nmol/L for nitrate and 0.6 nmol/L for nitrite. Upper working limit for LWCC: Phosphate 100 nmol/L Nitrate 200 nmol/L Nitrite 200 nmol/L |
| Date received: | 20210511 |
| Start date: | 20111106 |
| End date: | 20111209 |
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| West boundary: | -70.151 |
| East boundary: | -24.534 |
| North boundary: | 40.177 |
| South boundary: | 17.415 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Metadata version: | 1 |
| Keydate: | 2023-05-12 04:49:02+00 |
| Editdate: | 2023-05-12 04:49:54+00 |