Annual nitrate drawdown observed by SOCCOM profiling floats and the relationship to annual net community production

Johnson, Kenneth S.; Plant, Joshua N.; Dunne, John P.; Talley, Lynne D.; Sarmiento, Jorge L.

doi:10.1002/2017jc012839

i

Annual nitrate drawdown observed by SOCCOM profiling floats and the relationship to annual net community production

Supporting Files

2017
By Johnson, Kenneth S. ; Plant, Joshua N. ; Dunne, John P. ; ...

Details

Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Johnson, Kenneth S. ; Plant, Joshua N. ; Dunne, John P. ; Talley, Lynne D. ; Sarmiento, Jorge L.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)
Description:

Annual nitrate cycles have been measured throughout the pelagic waters of the Southern Ocean, including regions with seasonal ice cover and southern hemisphere subtropical zones. Vertically resolved nitrate measurements were made using in situ ultraviolet spectrophotometer (ISUS) and submersible ultraviolet nitrate analyzer (SUNA) optical nitrate sensors deployed on profiling floats. Thirty‐one floats returned 40 complete annual cycles. The mean nitrate profile from the month with the highest winter nitrate minus the mean profile from the month with the lowest nitrate yields the annual nitrate drawdown. This quantity was integrated to 200 m depth and converted to carbon using the Redfield ratio to estimate annual net community production (ANCP) throughout the Southern Ocean south of 30°S. A well‐defined, zonal mean distribution is found with highest values (3–4 mol C m−2 yr−1) from 40 to 50°S. Lowest values are found in the subtropics and in the seasonal ice zone. The area weighted mean was 2.9 mol C m−2 yr−1 for all regions south of 40°S. Cumulative ANCP south of 50°S is 1.3 Pg C yr−1. This represents about 13% of global ANCP in about 14% of the global ocean area.
Keywords:

Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Space And Planetary Science Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 122(8), 6668-6683
DOI:

https://doi.org/10.1002/2017jc012839
ISSN:

2169-9275 ; 2169-9291
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:

CC BY-NC-ND
Compliance:

Library
Main Document Checksum:

urn:sha256:d0a74f6509d1bbc8aed562067c64ab7980ac9cf73aadf89eac62416c82907641
Download URL:

https://repository.library.noaa.gov/view/noaa/59322/noaa_59322_DS1.pdf
File Type:

[PDF - 2.57 MB ]

Machine readable version (XML)

Download

ON THIS PAGE

Details Supporting Files

The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.