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 |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
eScholarship, University of California
2005
|
Subjects: | |
Online Access: | http://www.escholarship.org/uc/item/6c40w7fz |
id |
ftcdlib:qt6c40w7fz |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:qt6c40w7fz 2023-05-15T17:34:15+02:00 Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean Druffel, E. R. M Bauer, J. E Griffin, S. n/a - n/a 2005-03-01 application/pdf http://www.escholarship.org/uc/item/6c40w7fz english eng eScholarship, University of California qt6c40w7fz http://www.escholarship.org/uc/item/6c40w7fz Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Druffel, E. R. M; Bauer, J. E; & Griffin, S.(2005). Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean. Geochemistry, Geophysics, Geosystems, 6(3), n/a - n/a. doi:10.1029/2004GC000842. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/6c40w7fz Physical Sciences and Mathematics Amazon carbon cycling POC radiocarbon total CO2 article 2005 ftcdlib https://doi.org/10.1029/2004GC000842 2016-04-02T18:32:27Z 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 Δ14C results revealed postbomb carbon in river and ocean waters, with slightly higher values at the river mouth. The low DIC δ13C 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 Δ14C 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. Article in Journal/Newspaper North Atlantic University of California: eScholarship Geochemistry, Geophysics, Geosystems 6 3 n/a n/a |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics Amazon carbon cycling POC radiocarbon total CO2 |
spellingShingle |
Physical Sciences and Mathematics Amazon carbon cycling POC radiocarbon total CO2 Druffel, E. R. M Bauer, J. E Griffin, S. Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean |
topic_facet |
Physical Sciences and Mathematics Amazon carbon cycling POC radiocarbon total CO2 |
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 Δ14C results revealed postbomb carbon in river and ocean waters, with slightly higher values at the river mouth. The low DIC δ13C 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 Δ14C 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 |
Article in Journal/Newspaper |
author |
Druffel, E. R. M Bauer, J. E Griffin, S. |
author_facet |
Druffel, E. R. M Bauer, J. E Griffin, S. |
author_sort |
Druffel, E. R. M |
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 |
eScholarship, University of California |
publishDate |
2005 |
url |
http://www.escholarship.org/uc/item/6c40w7fz |
op_coverage |
n/a - n/a |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Druffel, E. R. M; Bauer, J. E; & Griffin, S.(2005). Input of particulate organic and dissolved inorganic carbon from the Amazon to the Atlantic Ocean. Geochemistry, Geophysics, Geosystems, 6(3), n/a - n/a. doi:10.1029/2004GC000842. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/6c40w7fz |
op_relation |
qt6c40w7fz http://www.escholarship.org/uc/item/6c40w7fz |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2004GC000842 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
6 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766133020432007168 |