INVESTIGATIONS ON MOISTURE TRANSPORTS, BUDGETS AND SOURCES RESPONSIBLE FOR THE DECADAL VARIABILITY OF PRECIPITATION IN SOUTHERN CHINA |
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Authors: | HU Ya-min SI Dong LIU Yan-ju and ZHAO Liang |
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Institution: | Guangdong Climate Center, Guangdong Province, Guangzhou 510080 China |
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Abstract: | In the context of global warming, apparent decdal-interdecdal
variabilities can be detected in summer precipitation in southern China.
Especially around the 1990s, precipitation in South China experienced a phase
transition from a deficiency regime to an abundance regime in the early 1990s,
while the Yangtze River Valley witnessed a phase shift of summer precipitation
from abundance to deficiency in the late 1990s. Pertinent analyses reveal a close
relationship between such decadal precipitation shifts and moisture budgets,
which is mainly modulated by the meridional component. This relationship can be
attributed to large-scale moisture transport anomalies. Further, the HYSPLIT
model is utilized to quantitatively evaluate relative moisture contributions from
diverse sources during different regimes. It can be found that during the period
with abundant precipitation in South China, the moisture contribution from the
source of Indochina Peninsula-South China Sea increased significantly, while
during the deficient precipitation regime in the Yangtze River Valley, moisture
from local source, western Pacific and Indochina Peninsula-South China Sea
contributed less to precipitation. It means some new features of relative
moisture contributions from diverse sources to precipitation anomaly in southern
China took shape after 1990s. |
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Keywords: | precipitation in southern China moisture transport moisture budget method tracing the air particle via Lagrange scheme |
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