Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean
We report concentrations and isotope measurements (radiocarbon and stable carbon) of dissolved inorganic carbon (DIC) and suspended particulate organic carbon (POC) in waters collected from the mouth of the Amazon River and the North Brazil Current. Samples were collected in November 1991, when the...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2326 2023-06-11T04:14:48+02:00 Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean Druffel, ERM Bauer, JE Griffin, S 2005-03-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1327 doi: 10.1029/2004GC000842 https://scholarworks.wm.edu/context/vimsarticles/article/2326/viewcontent/Druffel2005.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1327 doi: 10.1029/2004GC000842 https://scholarworks.wm.edu/context/vimsarticles/article/2326/viewcontent/Druffel2005.pdf VIMS Articles Amazon carbon cycling POC radiocarbon total CO(2) Physical Sciences Peer-Reviewed Articles Biogeochemistry text 2005 ftwilliammarycol https://doi.org/10.1029/2004GC000842 2023-05-04T17:44:25Z We report concentrations and isotope measurements (radiocarbon and stable carbon) of dissolved inorganic carbon (DIC) and suspended particulate organic carbon (POC) in waters collected from the mouth of the Amazon River and the North Brazil Current. Samples were collected in November 1991, when the Amazon hydrograph was at its annual minimum and the North Brazil Current had retroflected into the equatorial North Atlantic. The DIC D 14 C results revealed postbomb carbon in river and ocean waters, with slightly higher values at the river mouth. The low DIC delta(13)C signature of the river end-member (-11%) demonstrates that about half of the DIC originated from the remineralization of terrestrially derived organic matter. A linear relationship between DIC and salinity indicates that DIC was mixed nearly conservatively in the transition zone from the river mouth to the open ocean, though there was a small amount (<= 10%) of organic matter remineralization in the mesohaline region. The POC Delta(14)C values in the river mouth were markedly lower than those values from the western Amazon region (Hedges et al., 1986). We conclude that the dominant source of POC near the river mouth and in the inner Amazon plume during November 1991 was aged, resuspended material of significant terrestrial character derived from shelf sediments, while the outer plume contained mainly marine-derived POC. Text North Atlantic W&M ScholarWorks Geochemistry, Geophysics, Geosystems 6 3 n/a n/a |
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W&M ScholarWorks |
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Amazon carbon cycling POC radiocarbon total CO(2) Physical Sciences Peer-Reviewed Articles Biogeochemistry |
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Amazon carbon cycling POC radiocarbon total CO(2) Physical Sciences Peer-Reviewed Articles Biogeochemistry Druffel, ERM Bauer, JE Griffin, S Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
topic_facet |
Amazon carbon cycling POC radiocarbon total CO(2) Physical Sciences Peer-Reviewed Articles Biogeochemistry |
description |
We report concentrations and isotope measurements (radiocarbon and stable carbon) of dissolved inorganic carbon (DIC) and suspended particulate organic carbon (POC) in waters collected from the mouth of the Amazon River and the North Brazil Current. Samples were collected in November 1991, when the Amazon hydrograph was at its annual minimum and the North Brazil Current had retroflected into the equatorial North Atlantic. The DIC D 14 C results revealed postbomb carbon in river and ocean waters, with slightly higher values at the river mouth. The low DIC delta(13)C signature of the river end-member (-11%) demonstrates that about half of the DIC originated from the remineralization of terrestrially derived organic matter. A linear relationship between DIC and salinity indicates that DIC was mixed nearly conservatively in the transition zone from the river mouth to the open ocean, though there was a small amount (<= 10%) of organic matter remineralization in the mesohaline region. The POC Delta(14)C values in the river mouth were markedly lower than those values from the western Amazon region (Hedges et al., 1986). We conclude that the dominant source of POC near the river mouth and in the inner Amazon plume during November 1991 was aged, resuspended material of significant terrestrial character derived from shelf sediments, while the outer plume contained mainly marine-derived POC. |
format |
Text |
author |
Druffel, ERM Bauer, JE Griffin, S |
author_facet |
Druffel, ERM Bauer, JE Griffin, S |
author_sort |
Druffel, ERM |
title |
Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
title_short |
Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
title_full |
Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
title_fullStr |
Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
title_full_unstemmed |
Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
title_sort |
input of particulate organic and dissolved inorganic carbon from the amazon to the atlantic ocean |
publisher |
W&M ScholarWorks |
publishDate |
2005 |
url |
https://scholarworks.wm.edu/vimsarticles/1327 https://scholarworks.wm.edu/context/vimsarticles/article/2326/viewcontent/Druffel2005.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1327 doi: 10.1029/2004GC000842 https://scholarworks.wm.edu/context/vimsarticles/article/2326/viewcontent/Druffel2005.pdf |
op_doi |
https://doi.org/10.1029/2004GC000842 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
6 |
container_issue |
3 |
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n/a |
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n/a |
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1768371100563013632 |