Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export
Monthly hydrographic, primary production, bacterial production, and settling particulate carbon flux observations were collected between November 1995 and December 1997 at 10.5 degreesN, 64.67 degreesW within the Cariaco Basin, off Venezuela. Upwelling of Subtropical Underwater (SUW) started around...
Published in: | Journal of Geophysical Research: Oceans |
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Digital Commons @ University of South Florida
2001
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/56 https://doi.org/10.1029/1999JC000291 https://digitalcommons.usf.edu/context/msc_facpub/article/1055/viewcontent/Muller_Karger_et_al_2001_Journal_of_Geophysical_Research__Oceans.pdf |
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-1055 2024-09-15T18:24:06+00:00 Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export Muller-Karger, Frank E. Varela, Ramon Thunell, Robert Scranton, Mary Bohrer, Richard Taylor, Gordon Capelo, Juan Astor, Yrene Tappa, Eric Ho, Tung-Yuan Walsh, John J. 2001-03-15T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/56 https://doi.org/10.1029/1999JC000291 https://digitalcommons.usf.edu/context/msc_facpub/article/1055/viewcontent/Muller_Karger_et_al_2001_Journal_of_Geophysical_Research__Oceans.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/56 doi:10.1029/1999JC000291 https://digitalcommons.usf.edu/context/msc_facpub/article/1055/viewcontent/Muller_Karger_et_al_2001_Journal_of_Geophysical_Research__Oceans.pdf default Marine Science Faculty Publications Life Sciences Marine Biology article 2001 ftunisfloridatam https://doi.org/10.1029/1999JC000291 2024-08-23T08:09:14Z Monthly hydrographic, primary production, bacterial production, and settling particulate carbon flux observations were collected between November 1995 and December 1997 at 10.5 degreesN, 64.67 degreesW within the Cariaco Basin, off Venezuela. Upwelling of Subtropical Underwater (SUW) started around October and lasted through approximately May of the following year. Wind speeds >7 m s(-1) were observed between January and June, with weaker winds (s(-1)) between July and December. The upwelling cycle was therefore out of phase with that of the trade winds by 2-3 months. A seasonal cycle punctuated by transient extremes associated with subsurface ventilation events was observed in primary production. High bacterial activity and organic carbon recycling rates were observed near the oxic-anoxic interface. Integrated primary production was 690 gC m(-2) yr(-1) in 1996 and 540 gC m(-2) yr(-1) in 1997. Settling carbon flux measured with sediment traps was about 5.6% of integrated primary production at 275 m and about 1.7% at 1225 m, with no seasonality in the proportion of vertical flux to primary production. In total, between 10 and 11 gC m(-2) yr were delivered to the bottom sediment of Cariaco, which suggests that between 4 x 10(5) and 1 x 10(6) t of C yr(-1) were delivered to sediments within the upwelling area of the Cariaco Basin. This represents permanent sequestration of carbon previously entrained in the North Atlantic gyre in the area of formation of SUW. Results suggests that upwelled inorganic nitrogen, rather than nitrogen fixation, is responsible for the large productivity and particulate carbon settling flux in the Cariaco Basin. Article in Journal/Newspaper North Atlantic Digital Commons University of South Florida (USF) Journal of Geophysical Research: Oceans 106 C3 4527 4542 |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Life Sciences Marine Biology |
spellingShingle |
Life Sciences Marine Biology Muller-Karger, Frank E. Varela, Ramon Thunell, Robert Scranton, Mary Bohrer, Richard Taylor, Gordon Capelo, Juan Astor, Yrene Tappa, Eric Ho, Tung-Yuan Walsh, John J. Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
topic_facet |
Life Sciences Marine Biology |
description |
Monthly hydrographic, primary production, bacterial production, and settling particulate carbon flux observations were collected between November 1995 and December 1997 at 10.5 degreesN, 64.67 degreesW within the Cariaco Basin, off Venezuela. Upwelling of Subtropical Underwater (SUW) started around October and lasted through approximately May of the following year. Wind speeds >7 m s(-1) were observed between January and June, with weaker winds (s(-1)) between July and December. The upwelling cycle was therefore out of phase with that of the trade winds by 2-3 months. A seasonal cycle punctuated by transient extremes associated with subsurface ventilation events was observed in primary production. High bacterial activity and organic carbon recycling rates were observed near the oxic-anoxic interface. Integrated primary production was 690 gC m(-2) yr(-1) in 1996 and 540 gC m(-2) yr(-1) in 1997. Settling carbon flux measured with sediment traps was about 5.6% of integrated primary production at 275 m and about 1.7% at 1225 m, with no seasonality in the proportion of vertical flux to primary production. In total, between 10 and 11 gC m(-2) yr were delivered to the bottom sediment of Cariaco, which suggests that between 4 x 10(5) and 1 x 10(6) t of C yr(-1) were delivered to sediments within the upwelling area of the Cariaco Basin. This represents permanent sequestration of carbon previously entrained in the North Atlantic gyre in the area of formation of SUW. Results suggests that upwelled inorganic nitrogen, rather than nitrogen fixation, is responsible for the large productivity and particulate carbon settling flux in the Cariaco Basin. |
format |
Article in Journal/Newspaper |
author |
Muller-Karger, Frank E. Varela, Ramon Thunell, Robert Scranton, Mary Bohrer, Richard Taylor, Gordon Capelo, Juan Astor, Yrene Tappa, Eric Ho, Tung-Yuan Walsh, John J. |
author_facet |
Muller-Karger, Frank E. Varela, Ramon Thunell, Robert Scranton, Mary Bohrer, Richard Taylor, Gordon Capelo, Juan Astor, Yrene Tappa, Eric Ho, Tung-Yuan Walsh, John J. |
author_sort |
Muller-Karger, Frank E. |
title |
Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
title_short |
Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
title_full |
Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
title_fullStr |
Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
title_full_unstemmed |
Annual Cycle of Primary Production in the Cariaco Basin: Response to Upwelling and Implications for Vertical Export |
title_sort |
annual cycle of primary production in the cariaco basin: response to upwelling and implications for vertical export |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2001 |
url |
https://digitalcommons.usf.edu/msc_facpub/56 https://doi.org/10.1029/1999JC000291 https://digitalcommons.usf.edu/context/msc_facpub/article/1055/viewcontent/Muller_Karger_et_al_2001_Journal_of_Geophysical_Research__Oceans.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/56 doi:10.1029/1999JC000291 https://digitalcommons.usf.edu/context/msc_facpub/article/1055/viewcontent/Muller_Karger_et_al_2001_Journal_of_Geophysical_Research__Oceans.pdf |
op_rights |
default |
op_doi |
https://doi.org/10.1029/1999JC000291 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
106 |
container_issue |
C3 |
container_start_page |
4527 |
op_container_end_page |
4542 |
_version_ |
1810464400816996352 |