[1] The climatic features of the water vapor transport (WVT), which is closely related to rainfall in the middle latitudes around east Asia, are investigated using reanalysis data in June and September. A large amount of water vapor is intermittently transported in September in association with the movement of typhoons, but continuously transported in June. We defined a typhoon term as that when a typhoon or tropical storm is in Region A (20N–40N, 120E–150E) to estimate the effect on the poleward WVT. In September, the poleward WVT through Segment B (25N, 130E–150E) in the typhoon term (38.5% of the total term) was about 84% of that in the 20-year-accumulated total term, indicating that the climatic poleward WVT is greatly affected by typhoons and tropical storms. It is concluded that the contribution of typhoons and tropical storms is indispensable for the formation of a climatic atmospheric field around east Asia in September.
[1]
F. Kimura,et al.
Formation Mechanism of the Simulated SPCZ and Baiu Front Using a Regional Climate Model
,
2003
.
[2]
J. Matsumoto.
Large-scale features associated with the frontal zone over East Asia from late summer to autumn
,
1988
.
[3]
T. Murakami,et al.
On the Rainy Season in the Early Autumn
,
1962
.
[4]
P. Xie,et al.
Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs
,
1997
.
[5]
K. Ninomiya.
1991年7月1〜10日の強い降雨を伴う梅雨前線の大規模及びメソ-α-規模の様相
,
2000
.