华南前汛期印度洋海温异常与海南岛降水的关系

doi:10.3969/j.issn.1673-503X.2017.01.012

Abstract

Abstract: Based on monthly precipitation data obtained from seven meteorological stations on Hainan Island in the pre-flood season (April-June) from 1969 to 2013,the NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) reanalysis data and the HadISST (Hadley Centre sea-Ice and Sea Surface Temperature) dataset,the relationship between sea surface temperature (SST) anomaly over the Indian Ocean and precipitation in Hainan Island was investigated,and a sensitivity experiment was conducted by using the ECHAM5 model.The results show that precipitation in the pre-flood season in Hainan Island mainly occurs in May and June,and the maximum rainfall occurs in the eastern and northern regions of Hainan Island.There is a significantly negative correlation between SST over the Indian Ocean and precipitation in Hainan Island during the pre-flood season.The SST over the Indian Ocean increases anomalously,corresponding to the weak Indian monsoon and strong anomalous easterlies in the equatorial region over the Pacific Ocean.It causes anomalous anticyclones over the northwest Pacific Ocean and the northern South China Sea,which suppresses the convective development over the Hainan Island.Moreover,the anomalous easterlies in the southern edge of anticyclone hinder the transport of water vapor in the Bay of Bengal,resulting in the decreasing precipitation over Hainan Island,and vice versa.The results from numerical experiments indicate that the warmer SST over the Indian Ocean favors the maintenance and development of anticyclones at lower levels over the northwest Pacific Ocean and leads to less precipitation in Hainan Island during the pre-flood season of South China.

Key words: Pre-flood season in South China, Precipitation, Sensitivity experiment

CLC Number:

P467

CHENG Shou-chang, HU De-qiang, YANG Yang, KE Yuan-hui, TAO Li. Relationship between sea surface temperature anomaly over the Indian Ocean and precipitation anomaly in Hainan Island during the pre-flood season in South China[J]. Journal of Meteorology and Environment, 2017, 33(1): 87-92.

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Relationship between sea surface temperature anomaly over the Indian Ocean and precipitation anomaly in Hainan Island during the pre-flood season in South China

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