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Sea surface pCO2 and carbon export during the Labrador Sea spring-summer bloom: An in situ mass balance approach
Citation
Martz, TR and DeGrandpre, MD and Strutton, PG and McGillis, WR and Drennan, WM, Sea surface pCO2 and carbon export during the Labrador Sea spring-summer bloom: An in situ mass balance approach, Journal of Geophysical Research-Space Physics, 114, (C09008) pp. 1-12. ISSN 0148-0227 (2009) [Refereed Article]
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Copyright Statement
Copyright 2009 American Geophysical Union.
Abstract
We report depth-resolved in situ time series of the partial pressure of CO2 (pCO2) and
other carbon-related parameters spanning the development and decline of a high-latitude
phytoplankton bloom. A suite of sensors was deployed on a mooring in the Labrador
Sea from June to August 2004. The study became quasi-Lagrangian when the mooring
broke free in late June. Measured parameters included pCO2, chlorophyll a
fluorescence, beam c, optical backscatter, and photosynthetically active radiation.
During the bloom, the pCO2 was drawn down from 330 to 260 μatm, corresponding to a
70 μmol kg-1 decrease of dissolved inorganic carbon (DIC). One-dimensional model results
suggest that the observed drawdown was primarily driven by local processes and
contributions from horizontal advection were minimal. A mass balance using the DIC and
particulate organic carbon found that 47 mmol C m-2 d-1 of DIC was assimilated into
biomass. The bloom biomass was not remineralized in the mixed layer but was rapidly
exported below 35 m within 15 days of the bloom. As a consequence, the large air-sea pCO2
gradient persisted, and approximately 30% of the DIC was regained through air-sea
exchange by the end of the study. It is likely that all of the exported organic matter,
corresponding to 5.4 +- 1.9 Tg of carbon, was replaced by atmospheric pCO2 prior to the onset
of deep convective mixing.
Item Details
Item Type: | Refereed Article |
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Keywords: | Labrador Sea, carbon cycling |
Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Biological oceanography |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Strutton, PG (Professor Peter Strutton) |
ID Code: | 80210 |
Year Published: | 2009 |
Web of Science® Times Cited: | 18 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2012-10-24 |
Last Modified: | 2022-08-29 |
Downloads: | 0 |
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