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| Titel |
Synthesis of observed air–sea CO2 exchange fluxes in the river-dominated East China Sea and improved estimates of annual and seasonal net mean fluxes |
| VerfasserIn |
C.-M. Tseng, P.-Y. Shen, K.-K. Liu |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2014-07-24), S.3855-3870 |
| Datensatznummer |
250117521
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| Publikation (Nr.) |
 copernicus.org/bg-11-3855-2014.pdf |
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| Zusammenfassung |
| Limited observations exist for a reliable assessment of annual CO2 uptake
that takes into consideration the strong seasonal variation in the
river-dominated East China Sea (ECS). Here we explore seasonally
representative CO2 uptakes by the whole East China Sea derived from
observations over a 14-year period. We firstly identified the biological
sequestration of CO2 taking place in the highly productive,
nutrient-enriched Changjiang River plume, dictated by the Changjiang River
discharge in warm seasons. We have therefore established an
empirical algorithm as a function of sea surface temperature (SST) and
Changjiang River discharge (CRD) for predicting sea surface pCO2.
Syntheses based on both observations and models show that the annually
averaged CO2 uptake from atmosphere during the period 1998–2011 was
constrained to about 1.8 ± 0.5 mol C m−2 yr−1. This assessment
of annual CO2 uptake is more reliable and representative, compared to
previous estimates, in terms of temporal and spatial coverage. Additionally,
the CO2 time series, exhibiting distinct seasonal pattern, gives mean
fluxes of −3.7 ± 0.5, −1.1 ± 1.3, −0.3 ± 0.8 and
−2.5 ± 0.7 mol C m−2 yr−1 in spring,
summer, fall and winter, respectively, and also reveals apparent
interannual variations. The flux seasonality shows a strong sink in spring
and a weak source in late summer–mid-fall. The weak sink status during
warm periods in summer–fall is fairly sensitive to changes of pCO2 and
may easily shift from a sink to a source altered by environmental changes
under climate change and anthropogenic forcing. |
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