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while the eastern one begins to rapidly increase during May-June, with the
200 W/m
2
core value appearing in May for the west and in June for the
east. The QTP heat source starts to decrease and withdraw southward from
July. The western heat source abates faster, changing into a heat sink in
October, 1 month earlier compared to the eastern one. It is depicted that
since 1979 the seasonal variability of the heat source has shown climate
transition signals, as clearly seen in 1990/1991.
Acknowledgments
The work was supported by a key item of National Natural Science
Foundation of China (40633018) and graduate student innovation planning
project in Jiangsu of China in 2006.
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