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Air-sea CO2 fluxes on the Bering Sea shelf

Air-sea CO2 fluxes on the Bering Sea shelf
Air-sea CO2 fluxes on the Bering Sea shelf
There have been few previous studies of surface seawater CO2 partial pressure (pCO2) variability and air-sea CO2 gas exchange rates for the Bering Sea shelf. In 2008, spring and summertime observations were collected in the Bering Sea shelf as part of the Bering Sea Ecological Study (BEST). Our results indicate that the Bering Sea shelf was close to neutral in terms of CO2 sink-source status in springtime due to relatively small air-sea CO2 gradients (i.e., ?pCO2 and sea-ice cover. However, by summertime, very low seawater pCO2 values were observed and much of the Bering Sea shelf became strongly undersaturated with respect to atmospheric CO2 concentrations. Thus the Bering Sea shelf transitions seasonally from mostly neutral conditions to a strong oceanic sink for atmospheric CO2 particularly in the "green belt" region of the Bering Sea where there are high rates of phytoplankton primary production (PP)and net community production (NCP). Ocean biological processes dominate the seasonal drawdown of seawater pCO2 for large areas of the Bering Sea shelf, with the effect partly countered by seasonal warming. In small areas of the Bering Sea shelf south of the Pribilof Islands and in the SE Bering Sea, seasonal warming is the dominant influence on seawater pCO2, shifting localized areas of the shelf from minor/neutral CO2 sink status to neutral/minor CO2 source status, in contrast to much of the Bering Sea shelf. Overall, we compute that the Bering Sea shelf CO2 sink in 2008 was 157 ± 35 Tg C yr?1 (Tg = 1012 g C) and thus a strong sink for CO2.
1726-4170
1237-1253
Bates, N.R.
954a83d6-8424-49e9-8acd-e606221c9c57
Mathis, J.T.
ea2fbcc0-d00e-44d4-98a8-0f97e7e3274b
Jeffries, M.A.
144d0093-9e6c-4775-aabf-8c64c4554ba8
Bates, N.R.
954a83d6-8424-49e9-8acd-e606221c9c57
Mathis, J.T.
ea2fbcc0-d00e-44d4-98a8-0f97e7e3274b
Jeffries, M.A.
144d0093-9e6c-4775-aabf-8c64c4554ba8

Bates, N.R., Mathis, J.T. and Jeffries, M.A. (2011) Air-sea CO2 fluxes on the Bering Sea shelf. Biogeosciences, 8 (5), 1237-1253. (doi:10.5194/bg-8-1237-2011).

Record type: Article

Abstract

There have been few previous studies of surface seawater CO2 partial pressure (pCO2) variability and air-sea CO2 gas exchange rates for the Bering Sea shelf. In 2008, spring and summertime observations were collected in the Bering Sea shelf as part of the Bering Sea Ecological Study (BEST). Our results indicate that the Bering Sea shelf was close to neutral in terms of CO2 sink-source status in springtime due to relatively small air-sea CO2 gradients (i.e., ?pCO2 and sea-ice cover. However, by summertime, very low seawater pCO2 values were observed and much of the Bering Sea shelf became strongly undersaturated with respect to atmospheric CO2 concentrations. Thus the Bering Sea shelf transitions seasonally from mostly neutral conditions to a strong oceanic sink for atmospheric CO2 particularly in the "green belt" region of the Bering Sea where there are high rates of phytoplankton primary production (PP)and net community production (NCP). Ocean biological processes dominate the seasonal drawdown of seawater pCO2 for large areas of the Bering Sea shelf, with the effect partly countered by seasonal warming. In small areas of the Bering Sea shelf south of the Pribilof Islands and in the SE Bering Sea, seasonal warming is the dominant influence on seawater pCO2, shifting localized areas of the shelf from minor/neutral CO2 sink status to neutral/minor CO2 source status, in contrast to much of the Bering Sea shelf. Overall, we compute that the Bering Sea shelf CO2 sink in 2008 was 157 ± 35 Tg C yr?1 (Tg = 1012 g C) and thus a strong sink for CO2.

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Published date: 2011
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 357328
URI: https://eprints.soton.ac.uk/id/eprint/357328
ISSN: 1726-4170
PURE UUID: 30a84a36-7476-4d2e-87ff-35201bd9afc0

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Date deposited: 24 Sep 2013 10:58
Last modified: 16 Jul 2019 21:22

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Contributors

Author: N.R. Bates
Author: J.T. Mathis
Author: M.A. Jeffries

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