East Asian summer monsoon simulation by a 20-km mesh AGCM
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East Asian summer monsoon climate simulated by a global 20-km mesh atmospheric general circulation model (AGCM) forced by the global sea surface temperature during the period 1979–1998 is investigated. In comparison with a lower resolution (180-km mesh) model experiment, it is revealed that the 20-km mesh AGCM shows the superiority in simulating orographic rainfall not only its location but also its amount. The Baiu frontal structure is also better simulated in the higher resolution model, which leads to stronger Baiu rainfall. The 20-km model also shows more intense extremes in precipitation. Interannual variability of June–August mean precipitation and seasonal march of the monsoon rain band are also investigated.
KeywordsEast Asian climate Summer monsoon High-resolution AGCM AMIP
The author would like to thank Dr. Ryo Mizuta and Mr. Kenji Kamiguchi for extremes indices calculation. The 20-km mesh model calculations were made on the Earth Simulator by global warming group under the framework of the “Kyosei Project 4: Development of Super High Resolution Global and Regional Climate Models” supported by the Research Revolution 2002 (RR2002) of the Ministry of Education, Sports, Culture, Science and Technology of Japan (MEXT). AK is also supported by the Global Environment Research Fund (B-062) by the Ministry of the Environment, Japan.
- Ding Y, Sikka DR (2006) Synoptic systems and weather. In: Wang B (ed) The Asian monsoon. pp 131–201Google Scholar
- Ninomiya K (2000) Large- and meso-a-scale characteristics of Meiyu/Baiu front associated with intense rainfalls in 1–10 July 1991. J Meteorol Soc Jpn 78:141–157Google Scholar
- Randall D, Pan DM (1993) Implementation of the Arakawa-Schubert cumulus parameterization with a prognostic closure. Meteorol Monogr 46:145–150Google Scholar
- Sugi M, Kawamura R, Sato N (1997) A study of SST-forced variability and potential predictability of seasonal mean fields using the JMA global model. J Meteorol Soc Jpn 75:717–736Google Scholar
- Tian S-F, Yasunari T (1998) Climatological aspects and mechanism of spring persistent rains over Central China. J Meteorol Soc Jpn 76:57–71Google Scholar
- Ueda H, Yasunari T (1996) Maturing process of summer monsoon over the western North Pacific—a coupled ocean/atmosphere system. J Meteorol Soc Jpn 74:493–508Google Scholar
- Ueda H, Yasunari T, Kawamura R (1995) Abrupt seasonal change of large-scale convective activity over the western Pacific in the northern summer. J Meteorol Soc Jpn 73:795–809Google Scholar
- Xie P, Yatagai A, Chen M, Hayasaka T, Fukushima Y, Liu C, Yang S (2007) A gauge-based analysis of daily precipitation over East Asia. J Hydrometeorol (in press)Google Scholar