Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
DIURNAL VARIATIONS OF WIND AND CONVECTIVE ACTIVITY IN INDONESIA
R. Araki (1), M.D. Yamanaka (1), S. Ogino (1), F. Murata (1), N. Okamoto (1), H. Hashiguchi (6)
(1) Graduate School of Science and Technology, Kobe University
(6) Radio Science Center for Space and Atmosphere, Kyoto University
The diurnal variations were analyzed based on data obtained with a boundary layer radar (BLR) at Serpong near Jakarta, West Java,
Indonesia (6.4S, 106.7E, 50MSL) in November-February (rainy season)
from 1994 to 1999, and in July-August (dry season) from 1995 to 2000.
Meridional winds were weak in average every month, but features like a
land-sea breeze circulation was observed every clear day in dry season. Northerly (sea breeze) was observed at a height range of 0.5-1.2km, and southerly (land breeze) was at 1.2-2.0 km from about 1200 LT to evening. They are reasonable because Serpong is situated south of the
Java Sea coastline (roughly east-west). In the rainy season, the land-sea breeze circulation was not clearer than in the dry season. For zonal winds, the background flow was easterly in the dry season, and was westerly in the rainy season. In the dry season, the mixing layer developed during 08-18 LT. And the deviation from mean diurnal variations of zonal winds was westerly inside the mixing layer. In the rainy season, the mixing layer was observed during 08-18 LT. But its development was weak. And easterly dominated during 06-18 LT.
The interannual variations of the diurnal variations were not clear in
the dry season. Particularly the interanuual variations of the land-sea breeze circulation in the rainy season were more fluctuating than in the dry season.
In the dry season, it is suggested that the diurnal variations of the zonal winds have some relationships to the development of the mixing
layer. The causes of the diurnal variations of zonal winds in the rainy
season are different from those in the dry season. The developments of
the land-sea breeze circulation and the mixing layer were weak in the
rainy season, probably because the solar irradiance at the ground
surface in the raniy season is less than in the dry season. Interannual
variations of rainfall amounts and convective clouds must be compared
with those of the diurnal variations of the winds.
Submittal Information
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Graduate School of Science and Technology, Kobe University | |
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Nada-ku, Kobe, Hyogo 657-8501 | |
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araki@shizen.sci.kobe-u.ac.jp | |