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| Titel |
Air–sea CO2 fluxes in the East China Sea based on multiple-year underway observations |
| VerfasserIn |
X.-H. Guo, W.-D. Zhai, M.-H. Dai, C. Zhang, Y. Bai, Y. Xu, Q. Li, G.-Z. Wang |
| 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 ; 12, no. 18 ; Nr. 12, no. 18 (2015-09-24), S.5495-5514 |
| Datensatznummer |
250118101
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| Publikation (Nr.) |
 copernicus.org/bg-12-5495-2015.pdf |
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| Zusammenfassung |
| This study reports the most comprehensive data set thus far of surface seawater
pCO2 (partial pressure of CO2) and the associated air–sea CO2
fluxes in a major ocean margin, the East China Sea (ECS), based on 24 surveys
conducted in 2006 to 2011. We showed highly dynamic spatial variability in
sea surface pCO2 in the ECS except in winter, when it ranged across a narrow
band of 330 to 360 μatm. We categorized the ECS into five different
domains featuring with different physics and biogeochemistry to better
characterize the seasonality of the pCO2 dynamics and to better
constrain the CO2 flux. The five domains are (I) the outer Changjiang
estuary and Changjiang plume, (II) the Zhejiang–Fujian coast, (III) the
northern ECS shelf, (IV) the middle ECS shelf, and (V) the southern ECS
shelf. In spring and summer, pCO2 off the Changjiang estuary was as low
as < 100 μatm, while it was up to > 400 μatm in
autumn. pCO2 along the Zhejiang–Fujian coast was low in spring, summer and
winter (300 to 350 μatm) but was relatively high in autumn (> 350 μatm). On the northern ECS shelf, pCO2 in summer and autumn was
> 340 μatm in most areas, higher than in winter and spring.
On the middle and southern ECS shelf, pCO2 in summer ranged from 380 to
400 μatm, which was higher than in other seasons (< 350 μatm). The area-weighted CO2 flux on the entire ECS shelf was
−10.0 ± 2.0 in winter, −11.7 ± 3.6 in spring, −3.5 ± 4.6 in
summer and −2.3 ± 3.1 mmol m−2 d−1 in autumn. It is important
to note that the standard deviations in these flux ranges mostly reflect the
spatial variation in pCO2 rather than the bulk uncertainty.
Nevertheless, on an annual basis, the average CO2 influx into the
entire ECS shelf was 6.9 ± 4.0 mmol m−2 d−1, about twice the
global average in ocean margins. |
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