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approach to Japan; approximately half of typhoons approach
to Japan in AGCM-20km results.
Although the reproducibility of Baiu and typhoons is poor in
AGCM-20km, we can discuss changes in the climatological
property of rainfall and temperature in the future climate. In
future climate experiments, appearance frequency of daily
precipitation amount exceeding 100 mm, simulated by
NHM-5km, increases more than 20%. The number of
maximum consecutive dry days increases in most regions of
Japan (Fig. 3). Several extremely hot days (maximum
temperature is greater than 35 degrees centigrade) become to
appear in some plain regions in future September.
6. Future plan
From 2009, new series of experiments are planed using
improved AGCM-20km and NHM-5km. In new AGCM-
20km, new cumulus convection scheme will be
implemented to improve the reproducibility of the Baiu front
and typhoons in Asia. In new NHM-5km, simple biosphere
model (SiB) will be implemented to improve the accuracy of
temperature projection. In addition, Kain-Fritsch scheme
will be improved to reduce artificial precipitation pattern.
The integrations in 25 warm seasons will be performed for
present (1979-2003), near-future (2015-2039) and future
(2075-2099) climates
.
Figure 3. Maximum consecutive dry days in JJA in
the (a) present and (b) future climates.
Acknowledgements
This work was conducted under the framework of the
KAKUSHIN Program of the Ministry of Education,
Culture, Sports, Science, and Technology (MEXT). The
calculations were performed on the Earth Simulator.
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