Inter-annual variation of chlorophyll in the northern South China Sea observed at the SEATS Station and its asymmetric responses to climate oscillation

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Title:	Inter-annual variation of chlorophyll in the northern South China Sea observed at the SEATS Station and its asymmetric responses to climate oscillation
Authors:	黃如瑤;Liu, K.-K.;Wang, L.-W.;Dai, M.;Tseng, C.-M.;Yang, Y.;Sui, C.-H.;Oey, L.;Tseng, K.-Y.;Huang, S.-M.
Contributors:	地球科學學院水文與海洋科學研究所
Keywords:	Analysis;Annual variations;Chlorophyll;El Nino;La Nina;Marine;Nutrients;Sea surface temperature;Seasonal variations;Thermocline;Time series;Wind speed
Date:	2013-11-29
Issue Date:	2026-04-23 11:08:06 (UTC+8)
Publisher:	European Geosciences Union;Katlenburg-Lindau: Copernicus GmbH
Abstract:	摘要： Abstract. It is widely recognised that the variation of average surface chlorophyll a concentration (Chl) in the South China Sea (SCS) is closely related to wind forcing, especially during the intense winter monsoon. In this study, we demonstrate that after removal of the seasonal cycles, the variation of Chl showed strong asymmetric responses to wind speed under El Niño or La Niña conditions. The analysis was based on a time-series of Chl in the study area (115–117° E, 17–19° N) around the SEATS (South-East Asian Time-series Study) station located in the central northern SCS from September 1997 to the end of 2011, which was constructed by merging the SeaWiFS data (1997–2006) and MODIS data (2003–2011). The merged daily data were validated by shipboard observations at the SEATS station. The non-seasonal variations of monthly mean Chl, wind speed, sea surface height (SSH) and sea surface temperature (SST) were examined against the multivariate ENSO index (MEI). The analysis reveals strongly asymmetric correlations of Chl and SST with positive MEI (El Niño) or negative MEI (La Niña). Under El Niño conditions, both showed significant correlations with MEI or wind speed; under La Niña conditions, both showed weak or insignificant correlations. The contrast was more pronounced for Chl than for SST. The subdued responses of Chl to wind forcing under La Niña conditions were attributable to a deepened thermocline, for which wind driven nutrient pumping is less efficient. A deeper thermocline, which was observed during the 1999–2000 La Niña event and inferred by positive SSH anomalies during other La Niña events, was probably caused by reduced SCS throughflow under La Niña conditions. Intrusion of the nutrient-depleted Kuroshio water in the surface layer as observed during the 1999–2000 La Niña could be partially responsible for the suppressed Chl response. 出版者： Katlenburg-Lindau: Copernicus GmbH 出版日期： 2013-11-20 出處： Biogeosciences, 2013-11, Vol.10 (11), p.7449-7462 資源來源： Agricultural & Environmental Science Collection 版權： COPYRIGHT 2013 Copernicus GmbH 版權： Copyright Copernicus GmbH 2013 識別號： ISSN: 1726-4189 識別號： ISSN: 1726-4170 識別號： EISSN: 1726-4189 識別號： DOI: 10.5194/bg-10-7449-2013
Appears in Collections:	[Graduate Institute of Hydrological and Oceanic Sciences] journal & Dissertation

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