0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports
Recently there has been discussion about the metabolic state of the ocean, with arguments questioning whether the open ocean is net autotrophic or net heterotrophic. Accurately determining the metabolic balance of a marine system depends on fully defining the system being evaluated and on quantifyin...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.391.6735 2023-05-15T15:10:56+02:00 0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports Dennis A. Haansell Hugh W. Ducklow Alison M. Macdonald Molly O'neil Baringer The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.6735 http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.6735 http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf text ftciteseerx 2016-01-08T02:17:02Z Recently there has been discussion about the metabolic state of the ocean, with arguments questioning whether the open ocean is net autotrophic or net heterotrophic. Accurately determining the metabolic balance of a marine system depends on fully defining the system being evaluated and on quantifying the inputs and outputs to that system. Here, a net northward transport of dissolved organic carbon (DOC) (across 24.5°N) of 3.3 ± 1.9 Tmol C yr- ' was determined using basin-wide transport estimates of DOC. This flux, coupled with DOC inputs from the Arctic Ocean (2.2 ± 0.8 Tmol C yr-'), the atmosphere (0.6 + 0.08 Tmol C yr-'), and rivers (3.1 ± 0.6 Tmol C yr '), indicates net heterotrophy in the North Atlantic (full depth, 24.5-72°N) of 9.2 + 2.2 Tmol C yr-'. This rate is small (<2%) compared to autochthonous production (-494 Tmol C yr-') and consumption (production:respiration of 0.98), indicating that the North Atlantic is essentially metabolically balanced and that autochthonous production is remineralized within the basin. The upper layer of the subtropical gyre has previously been reported to exhibit high rates of net heterotrophy, but our analysis does not support those findings. Instead, allochthonous inputs of organic carbon to the upper subtropical gyre are an order of magnitude less than required by the elevated rates of net heterotrophy reported. We find, too, that net mineralization of allochthonous DOC within the basin could account for 10 % of the preindustrial inorganic carbon exported from the basin to the south. Two factors, the Text Arctic Arctic Ocean North Atlantic Unknown Arctic Arctic Ocean |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Recently there has been discussion about the metabolic state of the ocean, with arguments questioning whether the open ocean is net autotrophic or net heterotrophic. Accurately determining the metabolic balance of a marine system depends on fully defining the system being evaluated and on quantifying the inputs and outputs to that system. Here, a net northward transport of dissolved organic carbon (DOC) (across 24.5°N) of 3.3 ± 1.9 Tmol C yr- ' was determined using basin-wide transport estimates of DOC. This flux, coupled with DOC inputs from the Arctic Ocean (2.2 ± 0.8 Tmol C yr-'), the atmosphere (0.6 + 0.08 Tmol C yr-'), and rivers (3.1 ± 0.6 Tmol C yr '), indicates net heterotrophy in the North Atlantic (full depth, 24.5-72°N) of 9.2 + 2.2 Tmol C yr-'. This rate is small (<2%) compared to autochthonous production (-494 Tmol C yr-') and consumption (production:respiration of 0.98), indicating that the North Atlantic is essentially metabolically balanced and that autochthonous production is remineralized within the basin. The upper layer of the subtropical gyre has previously been reported to exhibit high rates of net heterotrophy, but our analysis does not support those findings. Instead, allochthonous inputs of organic carbon to the upper subtropical gyre are an order of magnitude less than required by the elevated rates of net heterotrophy reported. We find, too, that net mineralization of allochthonous DOC within the basin could account for 10 % of the preindustrial inorganic carbon exported from the basin to the south. Two factors, the |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Dennis A. Haansell Hugh W. Ducklow Alison M. Macdonald Molly O'neil Baringer |
spellingShingle |
Dennis A. Haansell Hugh W. Ducklow Alison M. Macdonald Molly O'neil Baringer 0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
author_facet |
Dennis A. Haansell Hugh W. Ducklow Alison M. Macdonald Molly O'neil Baringer |
author_sort |
Dennis A. Haansell |
title |
0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
title_short |
0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
title_full |
0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
title_fullStr |
0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
title_full_unstemmed |
0 2004, by the American Society of Limnology and Oceanography. Inc. Metabolic poise in the North Atlantic Ocean diagnosed from organic matter transports |
title_sort |
0 2004, by the american society of limnology and oceanography. inc. metabolic poise in the north atlantic ocean diagnosed from organic matter transports |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.6735 http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf |
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Arctic Arctic Ocean |
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Arctic Arctic Ocean |
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Arctic Arctic Ocean North Atlantic |
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Arctic Arctic Ocean North Atlantic |
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http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.6735 http://yyy.rsmas.miami.edu/groups/biogeochem/Hansell pdfs/46 Hansell.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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