Impact of horizontal resolution on the simulation of the Asian summer monsoon and tropical cyclones in the JMA global model

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Article  

  Climate Dynamics
Publisher: Springer-Verlag Heidelberg
ISSN: 0930-7575 (Paper) 1432-0894 (Online)
DOI: 10.1007/s00382-004-0427-8
Issue: Volume 23, Number 2

Date:  August 2004
Page: 165  
Impact of horizontal resolution on the simulation of the Asian summer monsoon and tropical cyclones in the JMA global model
C. Kobayashi1, 2  and M. Sugi1

(1)  Climate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine Tsukuba-shi, Ibaraki-ken, Japan 305-0052
(2)  Present address: Climate Prediction Division, Japan Meteorological Agency, 1-3-4 ote-machi chiyoda-ku, Tokyo, Japan 100-8122

Received: 25 July 2003  Accepted: 8 March 2004  Published online: 29 May 2004

Abstract    To investigate the impact of increasing horizontal resolution on a simulated model climate, we conducted an experiment using the Japan Meteorological Agency (JMA) operational global atmosphere model (JMA-GSM0103). The models with four different horizontal resolutions ranging from T42 to T213 have been integrated over three years with prescribed climate sea surface temperature in the experiment. The distributions of 3-year averaged seasonal mean fields are basically similar among the models with different resolution, although there are some monotonic and systematic differences with increasing resolution. However, the climatology of synoptic scale phenomena is well represented in higher resolution models. The position and amount of precipitation in Baiu front (or Mei-yu) at higher resolution models agree well with observations. The start time of northward propagation of heavy precipitation over the Bay of Bengal, which is associated with Indian monsoon development, is also well simulated in higher resolution models. The number of tropical cyclones increases monotonically with resolutions. The simulated tropical cyclones become more realistic with increasing resolution.