The "charge/discharge" roles of the basin-wide mode of the Indian Ocean SST anomaly——influence on the South Asian High in summer

YANG Jian-ling; LIU Qin-yu

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YANG Jian-ling, LIU Qin-yu. The 'charge/discharge' roles of the basin-wide mode of the Indian Ocean SST anomaly——influence on the South Asian High in summer[J]. Haiyang Xuebao, 2008, 30(2): 12-19.

Citation:

YANG Jian-ling, LIU Qin-yu. The "charge/discharge" roles of the basin-wide mode of the Indian Ocean SST anomaly——influence on the South Asian High in summer[J]. Haiyang Xuebao, 2008, 30(2): 12-19.

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The "charge/discharge" roles of the basin-wide mode of the Indian Ocean SST anomaly——influence on the South Asian High in summer

Physical Oceanography Laboratory, and Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266103, China

Received Date: 2007-06-28
Rev Recd Date: 2007-10-10

Abstract

Abstract

Based on observational dat a and ocean-atmosphere coupled model experiments,by analyzing the influence of the sea surface temperature(SST)anomaly main mode of the tropical Pacific ENSO and the Indian Ocean basin-wide mode(IOBM)on the South Asian High(SAH)in boreal summer,the "charge/discharge" roles of the IOBM are revealed:Firstly,the SST anomaly in the mid-east equatorial of the Pacific charges to the Indian Ocean and induces the IOBM. Being the responding mode of the Pacific ENSO, the IOBM reaches its peak phase in the next spring of the ENSO developing year and can persist from the spring to the summer. Then,the warm(cool)SST anomaly of IOBM in the spring and the summer can in turn influence the atmospheric circulation and make SAH in summer stronger(weaker)through atmos-pheric response of "Matsuno-Gill pattern" and water vapor transportation ano maly by mean south west wind of Asian summer monsoon circulation,this process is called "discharge"1. While the direct influence of the SST anomaly of the mid-east equat orial Pacific on SAH in summer is not significant,and it is pointed out that the high positive sig nificant correlation between the SAH in summer and the leading 3~12 months Niño 3 index is only a superficies,and not the result from the direct influence of the ENSO but from the "charge/discharge" role of the Indian Ocean.
- the Indian Ocean,
- basin-wide mode,
- charge/discharge,
- the South Asian High

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