Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre
New estimates are obtained of oxygen utilization rates on isopycnal surfaces in the North Atlantic subtropical gyre thermocline based on tritium inventories (2.4-3.5 mol m-2 yr-1) and 228Ra measurements (8.5 _+ 0.8 mol m-2 yr-l). Arguments are given for why the tritium inventory oxygen utilization r...
Main Authors: | , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1990
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.357.5430 http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.357.5430 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.357.5430 2023-05-15T17:31:57+02:00 Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre Jorge L. Sarmiento Gerhard Thiele Robert M. Key Willard S. Moore The Pennsylvania State University CiteSeerX Archives 1990 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.357.5430 http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.357.5430 http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf text 1990 ftciteseerx 2016-01-08T00:38:29Z New estimates are obtained of oxygen utilization rates on isopycnal surfaces in the North Atlantic subtropical gyre thermocline based on tritium inventories (2.4-3.5 mol m-2 yr-1) and 228Ra measurements (8.5 _+ 0.8 mol m-2 yr-l). Arguments are given for why the tritium inventory oxygen utilization rate estimate may be too low. The 228Ra results are combined with recent estimates of oxygen utilization within the thermocline (Jenkins, 1987) as well as estimates of oxygen production in the mixed layer (Spitzer and Jenkins, 1989; Musgrave et al., 1988), to suggest a tentative overall oxygen balance for the whole water column. The new production of oxygen in the surface ocean (--•4.6 _+ 1.6 mol m-2 yr-1) appears to be lower than the estimated utilization within the thermocline (--•8.5 + 2 l _ 0.8 mol m- yr-), suggesting that there may be a net lateral import of organic matter into the thermoclinequivalent to a new production of--•3.9-+ 1.8 mol m-2 yr-1. The nitrogen balance is consistent with these results. An estimate for the total nitrogen remineralization rate in the thermocline is obtained from the oxygen utilization rate by using an-O2:N Redfield ratio of 9.1 _+ 0.4 for remineralization (Minster and Boulahdid, 1987), giving a nitrogen remineralization rate of--•0.93-+ 0.10 mol m-2 yr-I. Subtracting off the estimated lateral export of nitrate of--•0.51 + 0.21 mol m-2 yr-I, which is presumed to be balanced by a lateral import of dissolved organic nitrogen (Rintoul and Wunsch, 1990), gives a nitrate flux into the surface of--•0.42 _+ 0.23 mol m-2 yr-1, which is comparable to the estimate of 0.6-+ 0.2 mol m-2 yr-I obtained by Jenkins (1988) near Bermudas well as the 100-m particulate nitrogen flux of 0.33 mol m-2 yr-1 obtained Altabet (1989) near Bermuda. 1. Text North Atlantic Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
New estimates are obtained of oxygen utilization rates on isopycnal surfaces in the North Atlantic subtropical gyre thermocline based on tritium inventories (2.4-3.5 mol m-2 yr-1) and 228Ra measurements (8.5 _+ 0.8 mol m-2 yr-l). Arguments are given for why the tritium inventory oxygen utilization rate estimate may be too low. The 228Ra results are combined with recent estimates of oxygen utilization within the thermocline (Jenkins, 1987) as well as estimates of oxygen production in the mixed layer (Spitzer and Jenkins, 1989; Musgrave et al., 1988), to suggest a tentative overall oxygen balance for the whole water column. The new production of oxygen in the surface ocean (--•4.6 _+ 1.6 mol m-2 yr-1) appears to be lower than the estimated utilization within the thermocline (--•8.5 + 2 l _ 0.8 mol m- yr-), suggesting that there may be a net lateral import of organic matter into the thermoclinequivalent to a new production of--•3.9-+ 1.8 mol m-2 yr-1. The nitrogen balance is consistent with these results. An estimate for the total nitrogen remineralization rate in the thermocline is obtained from the oxygen utilization rate by using an-O2:N Redfield ratio of 9.1 _+ 0.4 for remineralization (Minster and Boulahdid, 1987), giving a nitrogen remineralization rate of--•0.93-+ 0.10 mol m-2 yr-I. Subtracting off the estimated lateral export of nitrate of--•0.51 + 0.21 mol m-2 yr-I, which is presumed to be balanced by a lateral import of dissolved organic nitrogen (Rintoul and Wunsch, 1990), gives a nitrate flux into the surface of--•0.42 _+ 0.23 mol m-2 yr-1, which is comparable to the estimate of 0.6-+ 0.2 mol m-2 yr-I obtained by Jenkins (1988) near Bermudas well as the 100-m particulate nitrogen flux of 0.33 mol m-2 yr-1 obtained Altabet (1989) near Bermuda. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jorge L. Sarmiento Gerhard Thiele Robert M. Key Willard S. Moore |
spellingShingle |
Jorge L. Sarmiento Gerhard Thiele Robert M. Key Willard S. Moore Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
author_facet |
Jorge L. Sarmiento Gerhard Thiele Robert M. Key Willard S. Moore |
author_sort |
Jorge L. Sarmiento |
title |
Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
title_short |
Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
title_full |
Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
title_fullStr |
Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
title_full_unstemmed |
Oxygen and nitrate new production and remineralization in the North Atlantic subtropical gyre |
title_sort |
oxygen and nitrate new production and remineralization in the north atlantic subtropical gyre |
publishDate |
1990 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.357.5430 http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.357.5430 http://www.gfdl.noaa.gov/bibliography/related_files/jls9002.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766129849327419392 |