Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls

YANG Ming-zhu; DING Yi-hui

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YANG Ming-zhu, DING Yi-hui. Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls[J]. Haiyang Xuebao, 2006, 28(4): 9-16.

Citation:

YANG Ming-zhu, DING Yi-hui. Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls[J]. Haiyang Xuebao, 2006, 28(4): 9-16.

YANG Ming-zhu, DING Yi-hui. Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls[J]. Haiyang Xuebao, 2006, 28(4): 9-16.

Citation:

YANG Ming-zhu, DING Yi-hui. Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls[J]. Haiyang Xuebao, 2006, 28(4): 9-16.

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Diagnostic study of the variation of Indian Ocean sea surface temperature and its impact on Indian summer monsoon rainfalls

YANG Ming-zhu¹,
DING Yi-hui²

1.
Laboratory for Climate Studies, China Meteorological Administration, National Climate Center, Beijing 100081, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China;Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
2.
Laboratory for Climate Studies, China Meteorological Administration, National Climate Center, Beijing 100081, China

Received Date: 2005-07-17
Rev Recd Date: 2006-04-15

Abstract

Abstract

The major modes and variations of Indian Ocean (IO) sea surface temperature (SST) and relationship with Indian Summer Monsoon Rainfalls (ISMR) are analyzed.The results show that the most significant mode of IOSST in recent 50 a is the warming trend at most of the ocean basin and there is abrupt warming in 1976, 1986 and 1996 respectively.The warming trend of IOSST has weak relationship with the decreasing trend of ISMR.During the different backg rounds after the leaps of IOSST, the relationship of ISMR between SST had changed in many regions but rather stable in extrat ropical IO.The stable correlation distribution is similar to the second mode of Indian Ocean SST EOF analysis and named as South Indian Ocean Dipole (SIOD).ISMR generally increase during positive SIOD (PSIOD) years and decrease during negative SIOD (NSIOD) years.The general circulation analysis shows, during PSIOD (NSIOD) phase, the SST anomalies of extratropcical IO will enhance (weaken) the Mascarene high by interacting with regional atmosphere, then enhance (weaken) the cross equatorial flow off Somali, produce convergence (divergence) at low level and divergence (convergence) at high level over India, and finally lead the ISMR increasing (decreasing).
- Indian Ocean sea surface temperature,
- South Indian Ocean Dipole,
- Indian summer monsoon rainfalls

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References(19)

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