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Potential controls on interannual partitioning of organic carbon during the winter/spring phytoplankton bloom at the Bermuda Atlantic time-series study (BATS) site

Potential controls on interannual partitioning of organic carbon during the winter/spring phytoplankton bloom at the Bermuda Atlantic time-series study (BATS) site
Potential controls on interannual partitioning of organic carbon during the winter/spring phytoplankton bloom at the Bermuda Atlantic time-series study (BATS) site
Seasonal dissolved organic carbon (DOC) accumulation and potential subsequent export, in addition to particulate organic carbon (POC) gravitational export, can be an important pathway of carbon removal from the surface ocean (>100 m) at the Bermuda Atlantic Time-series Study (BATS). We have compiled available data on seasonal DOC accumulation and POC flux during the course of the winter/spring bloom and examined some potential controls on the interannual variability of organic carbon partitioning between these two fates. When expressed as a fraction of the cumulative primary production, there was a significant negative relationship between seasonal DOC accumulation and POC flux. Over the course of the BATS data record two groups of phytoplankton, Haptophytes and Prochlorophytes, account for ?60% of the integrated (0–140 m) chlorophyll biomass. Variability in the relative abundance of Haptophytes and Prochlorophytes was significantly correlated to the export of carbon, with increased relative abundance of Haptophytes correlated with higher seasonal accumulation of DOC and lower POC fluxes. Variability in the abundance of Haptophytes during the winter/spring period was found to correlate negatively with the winter North Atlantic Oscillation (NAO) index. This relationship suggests that Haptophytes are a more important component of the phytoplankton community when a negative NAO phase enhances winter/spring mixing in the Sargasso Sea. These findings support a recent hypothesis that the increased stratification in the North Atlantic due to global warming could favor the blooming of diatoms over Haptophytes.
DOC, Carbon flux, Biological pump, Bermuda Atlantic time series, Sargasso Sea
0967-0637
1619-1636
Lomas, Michael W.
dda93180-d0dc-4069-bdf1-edb024255c18
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Lomas, Michael W.
dda93180-d0dc-4069-bdf1-edb024255c18
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57

Lomas, Michael W. and Bates, Nicholas R. (2004) Potential controls on interannual partitioning of organic carbon during the winter/spring phytoplankton bloom at the Bermuda Atlantic time-series study (BATS) site. Deep Sea Research Part I: Oceanographic Research Papers, 51 (11), 1619-1636. (doi:10.1016/j.dsr.2004.06.007).

Record type: Article

Abstract

Seasonal dissolved organic carbon (DOC) accumulation and potential subsequent export, in addition to particulate organic carbon (POC) gravitational export, can be an important pathway of carbon removal from the surface ocean (>100 m) at the Bermuda Atlantic Time-series Study (BATS). We have compiled available data on seasonal DOC accumulation and POC flux during the course of the winter/spring bloom and examined some potential controls on the interannual variability of organic carbon partitioning between these two fates. When expressed as a fraction of the cumulative primary production, there was a significant negative relationship between seasonal DOC accumulation and POC flux. Over the course of the BATS data record two groups of phytoplankton, Haptophytes and Prochlorophytes, account for ?60% of the integrated (0–140 m) chlorophyll biomass. Variability in the relative abundance of Haptophytes and Prochlorophytes was significantly correlated to the export of carbon, with increased relative abundance of Haptophytes correlated with higher seasonal accumulation of DOC and lower POC fluxes. Variability in the abundance of Haptophytes during the winter/spring period was found to correlate negatively with the winter North Atlantic Oscillation (NAO) index. This relationship suggests that Haptophytes are a more important component of the phytoplankton community when a negative NAO phase enhances winter/spring mixing in the Sargasso Sea. These findings support a recent hypothesis that the increased stratification in the North Atlantic due to global warming could favor the blooming of diatoms over Haptophytes.

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More information

Published date: November 2004
Keywords: DOC, Carbon flux, Biological pump, Bermuda Atlantic time series, Sargasso Sea
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 358303
URI: http://eprints.soton.ac.uk/id/eprint/358303
ISSN: 0967-0637
PURE UUID: ff586a69-b481-4d20-85ae-c48273f29121

Catalogue record

Date deposited: 03 Oct 2013 11:01
Last modified: 16 Jul 2019 21:21

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