Effects of air-sea interaction on the interannual oscillations of atmospheric boreal summer intraseasonal oscillations over the tropical Ocean

LIN Ai-lan; LI Tim; LI Chun-hui; LIANG Jian-yin; LUO Jing-Jia

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LIN Ai-lan, LI Tim, LI Chun-hui, LIANG Jian-yin, LUO Jing-Jia. Effects of air-sea interaction on the interannual oscillations of atmospheric boreal summer intraseasonal oscillations over the tropical Ocean[J]. Haiyang Xuebao, 2011, 33(4): 62-73.

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Effects of air-sea interaction on the interannual oscillations of atmospheric boreal summer intraseasonal oscillations over the tropical Ocean

1.
Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon, China Meteorological Administration, Guangzhou 510080,China
2.
IPRC and Department of Meteorology, University of Hawaii, Honolulu 96822, Hawaii;Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon, China Meteorological Administration, Guangzhou 510080,China
3.
Frontier Research Center for Global Change, JAMSTEC, Yokohama 2360001, Japan

Received Date: 2009-08-05

Abstract

Abstract

Intensity index series of different propagation mode are abstracted from the wavenumber-frequency analysis result of every year, the interannual oscillation spectrum characteristics of atmospheric boreal summer intraseasonal oscillations are analyzed and the effects of air-sea interaction on the interannual oscillations of atmospheric boreal summer intraseasonal oscillations over the tropical ocean are investigated using observational OLR and outcome of air-sea coupling numerical simulation experiments.It is shown that the distinct oscillation period of poleward westward propagation and northward propagation in the Indian Ocean is quasi-biannual while both of quasi-biannual and quasi 5-year are contained by eastward propagation of equator, northward propagation in South China Sea and northward propagation in western Pacific.The northward propagation in South China Sea is the only mode which holds the main oscillation period of quasi 5-year.There are reinforcing and weakening effects of air-sea interactions on the intensity of quasi-biannual and quasi 5-year oscillations of different index.By comparing different oceans, the most strengthen effect on quasi-biannual and quasi 5-year oscillations of eastward propagation, or quasi-biannual and quasi 5-year oscillations of northward propagation in South China Sea, is the air-sea interaction over western Pacific; the most strengthen effect on quasi-biannual oscillation of westward propagation, or quasi-biannual and quasi 5-year oscillations of northward propagation in western Pacific, is the air-sea interaction over the Indian Ocean.

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