Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean

YAN Hong-ming; YANG Hui; LI Chong-yin

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YAN Hong-ming, YANG Hui, LI Chong-yin. Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean[J]. Haiyang Xuebao, 2007, 29(5): 31-39.

Citation:

YAN Hong-ming, YANG Hui, LI Chong-yin. Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean[J]. Haiyang Xuebao, 2007, 29(5): 31-39.

YAN Hong-ming, YANG Hui, LI Chong-yin. Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean[J]. Haiyang Xuebao, 2007, 29(5): 31-39.

Citation:

YAN Hong-ming, YANG Hui, LI Chong-yin. Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean[J]. Haiyang Xuebao, 2007, 29(5): 31-39.

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Numerical simulations on the climate impacts of temperature dipole in the equatorial Indian Ocean

1.
LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Yunnan Climate Center, Kunming 650034, China
2.
LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
3.
LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China

Received Date: 2006-07-09
Rev Recd Date: 2007-02-25

Abstract

Abstract

Based on the analyses of fundamental feature of sea surface emperature variation in the Indian Ocean, particularly on the dipole in the equatorial Indian Ocean (IOD) and its influences, the impacts of the IOD on the Asian monsoon climate variation is studied by using numerical simulation with a GCM (IAP9L).The results show that the atmospheric circulation and precipitation over the Indian Ocean, South Asia and East Asia are quite sensitive to the forcing of anomalous SST in the equatorial Indian Ocean.The positive phase of the IOD will lead to anomalous easterly wind over the equatorial eastern Indian Ocean-southern Indian Peninsula the Arabian Sea, and anomalous anticyclonic circulation over the Bay of Bengal-China/Indian Peninsula.Thus it plays an important role in decreasing summer rainfall in the Indian Peninsula, South part of China/Indian Peninsula and Indonesia area, and increasing summer rainfall in southern China and East Africa.The negative phase of the IOD will lead to anomalous westerly wind over the equatorial eastern Indian Ocean and anom alous cyclonic circulation over the Bay of Bengal-China/Indian Peninsula.Thus it plays an important role in increasing summer rainfall in the Indian Peninsula, south part of China/Indian Peninsula and Indonesia area, and decreasing summer rainfall in southern China, the Bay of Bengal and East Africa.The simulation results in this paper are similar with that in the data analyses, the important impact of the IOD on climate variation in Asian monsoon area has been exposed practically.
- Indian Ocean,
- sea surface temperature dipole (mode),
- climate impact,
- numerical simulation

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References(17)

References

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