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| Titel |
The effect of typhoon on particulate organic carbon flux in the southern East China Sea |
| VerfasserIn |
C.-C. Hung, G.-C. Gong, W.-C. Chou, C.-C. Chung, M.-A. Lee, Y. Chang, H.-Y. Chen, S.-J. Huang, Y. Yang, W.-R. Yang, W.-C. Chung, S.-L. Li, E. Laws |
| 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 ; 7, no. 10 ; Nr. 7, no. 10 (2010-10-04), S.3007-3018 |
| Datensatznummer |
250005004
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| Publikation (Nr.) |
 copernicus.org/bg-7-3007-2010.pdf |
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| Zusammenfassung |
| Severe tropical storms play an important role in triggering phytoplankton
blooms, but the extent to which such storms influence biogenic carbon flux
from the euphotic zone is unclear. In 2008, typhoon Fengwong provided a
unique opportunity to study the in situ biological responses including
phytoplankton blooms and particulate organic carbon fluxes associated with a
severe storm in the southern East China Sea (SECS). After passage of the
typhoon, the sea surface temperature (SST) in the SECS was markedly cooler
(∼25 to 26 °C) than before typhoon passage (∼28 to 29 °C).
The POC flux 5 days after passage of the typhoon was 265 ± 14 mg C m−2 d−1, which was ∼1.7-fold that
(140–180 mg C m−2 d−1) recorded during a period (June–August, 2007) when no
typhoons occurred. A somewhat smaller but nevertheless significant increase
in POC flux (224–225 mg C m−2 d−1) was detected following typhoon
Sinlaku which occurred approximately 1 month after typhoon Fengwong,
indicating that typhoon events can increase biogenic carbon flux efficiency
in the SECS. Remarkably, phytoplankton uptake accounted for only about 5%
of the nitrate injected into the euphotic zone by typhoon Fengwong. It is
likely that phytoplankton population growth was constrained by a combination
of light limitation and grazing pressure. Modeled estimates of new/export
production were remarkably consistent with the average of new and export
production following typhoon Fengwong. The same model suggested that during
non-typhoon conditions approximately half of the export of organic carbon
occurs via convective mixing of dissolved organic carbon, a conclusion
consistent with earlier work at comparable latitudes in the open ocean. |
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