East Asia and Western Pacific METEOROLOGY AND CLIMATE

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over tost parts of India, Southeast Asia (Burma-Thailand-
Indochina) and North Chin during the monthes of April and
May are ^ accompanied by negative moisture sinks, indicating
sensible heat flux and evaporation from the ground
surface. Besides, the areas of strong positive heat source
over Burma and southern part of India along 75°E are
acconpanied by weakly positive moisture sink, indicating
that both condensation heating and sensible heating are
iaportant.
As shown by Zhu et ah (1980), the South Asian anticyclone
tigrates from the western Pacific to Southeast Asia
in spring and moves towards the Tibetan Plateau in summer.
From the 4-year lean flow fields.we see ( figures not shown)
that the center of the anticyclone at 200hPa is located at
about 10°N» 110°E in April, moves continously towards the
Plateau and reaches about 30°M, 89°E in August. On the other
hand, we only see the intensification of the heating in the
region of Buna-Yunnan-Sichuan and the expansion of the domain
of this strong heating region. We do not see the corresponding
ligration of the center of heat source during the same
period. It confirms that there is no immediate association
of the migration of the anticyclone with the seasonal change
of heating over Burma-Yunnan-Sichuan (cf. He et al.» 1987).
4. 7-Month Mean Distributions Of Heat Sources and Moisture
Sinks
a.Mean horizontal distributions of and Figures
2a~b show the horizontal distributions of the vertically integrated
heat source and moisture sink averaged
over the seven monthes. The pronounced heat source of 25GW/I
along the border between China and Burma Kj°2 si £22|j, ¥ i{\ n( \
the moisture sink of the sane order of magnitude «00¥/» ) and
is related to the rain in this region. Heat sources MOOi/ffl
in a belt extending from northeastern India .and Bengal to
South China also corresponds well to miosture sinks of similar
magnitudes. The saae is true over the island of Borneo. He
find heat sources of 150-20QW/ 2 over southern Burma, which
are accompanied by weak moisture sinks of.50S/»«, indicating
that sensible heating is also very important in this region.
There exists a region of relatively large values of heat source
( .in the vertical plane along 110 E.