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Influence of sea surface temperature on the intraseasonal variability of the South China Sea summer monsoon

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/53185

Title: Influence of sea surface temperature on the intraseasonal variability of the South China Sea summer monsoon
Authors: Roxy, Mathew Browse this author
Tanimoto, Youichi Browse this author →KAKEN DB
Keywords: South China Sea
Asian monsoon
Ocean atmosphere interaction
Intraseasonal variablity
Issue Date: Sep-2012
Publisher: Springer-Verlag
Journal Title: Climate Dynamics
Volume: 39
Issue: 5
Start Page: 1209
End Page: 1218
Publisher DOI: 10.1007/s00382-011-1118-x
Abstract: The objective of this study is to examine, based on recently available high resolution satellite and observational data, the evolution and role of sea surface temperature (SST) in influencing the intraseasonal variability of the South China Sea (SCS) summer monsoon (SM). The study focuses on the 30-60 day timescale when the northward propagating anomalies are dominant over the SCS. Composite analysis of the SST maximum events during SCS SM shows that increased SST anomalies over the SCS are significantly influenced by the downward shortwave radiation flux anomalies, with the suppressed surface latent heat flux anomalies supplementing to it. A thermal damping of the positive SST anomalies induces positive upward heat fluxes, which then destabilize the lower atmosphere between 1000 hPa and 700 hPa. The positive SST anomalies lead the positive precipitation anomalies over the SCS by 10 days, with a significant correlation (r = 0.44) between the SST-precipitation anomalies. The new findings here indicate an ocean-to-atmosphere effect over the SCS, where underlying SST anomalies tend to form a favorable condition for convective activity and sustain enhanced precipitation during the SCS SM. It is also argued, based on our observations, that the negative sea level pressure anomalies induced by the positive SST anomalies play a role in enhancing the northward propagation of the intraseasonal anomalies over the SCS.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/53185
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 谷本 陽一

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