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| Titel |
Air-sea CO2 fluxes on the Bering Sea shelf |
| VerfasserIn |
N. R. Bates, J. T. Mathis, M. A. Jeffries |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-23), S.1237-1253 |
| Datensatznummer |
250005819
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| Publikation (Nr.) |
 copernicus.org/bg-8-1237-2011.pdf |
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| Zusammenfassung |
| 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., ΔpCO2 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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