Spatial and Seasonal Variation of Rain Profiles over Asia Observed by TRMM/PR
M. Hirose (1), K. Nakamura (1)
(1) Hydrospheric Atmospheric Research Center, Nagoya Univ.
Tropical Rainfall Measuring Mission/Precipitation Radar
(TRMM/PR) made possible to evaluate the global
characteristics of vertical structures of
rainfall. This study is intended to depict features of
seasonal variation of vertical gradient of rainrate over
monsoon Asia using a three-year TRMM/PR data (December
1997 to November 2000).
We focused on the features of downward
decreasing (DD) or increasing (DI) in lower part of
vertical profile of rainrate. We made horizontal map
of this decreasing/increasing characteristics in
vertical gradient of rainrate over Asia. The pattern
showed clear land-ocean contrasts and had monthly
variation as monsoon progresses in Asia. The DD pattern
migrated northward around the monsoon onset and withdrew
southward in the decaying period. The seasonal march of
DD pattern were clear especially over Indian subcontinent.
DD seemed to be bordering on monsoon rainfall over India.
We observed that seasonal change in characteristics of
vertical profile were reflected in horizontal extent of
rain and the storm height. It seems
that a large storm system tends to have high storm height
and to become DD profile. Most of isolated rain system
with low storm height shows DI profile. DD often appears
around the border between dry and wet region, which
suggests that DD often occurs when land is not
thoroughly wet.
Submittal Information
Name :
Date :
Masafumi Hirose
04-Jun-01-15:26:52
Organization :
Theme :
Hydrospheric Atmospheric Research Center, Nagoya Univ.
