Characteristics of anomalous precipitation events over eastern China during the past five centuries |
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| Authors: | Caiming Shen Wei-Chyung Wang Zhixin Hao Wei Gong |
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| Institution: | (1) Atmospheric Sciences Research Center, State University of New York, 251 Fuller Road, Albany, NY 12203, USA |
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| Abstract: | Characteristics of anomalous precipitation events during the past five centuries in North China (NC) and the middle-lower
Yangtze River Valley (MLYRV) were investigated using the data network of dryness/wetness index (DWI) over eastern China. The
high occurrence frequency of anomalous precipitation events mainly occurred at periods of high solar forcing, active volcanic
eruption, and large anthropogenic forcing (the twentieth century). Coherence and dipole were the two dominant modes in spatial
patterns of anomalous precipitation events. Coherent floods dominated the eighteenth and nineteenth centuries, whereas coherent
droughts occurred frequently in the seventeenth and twentieth centuries. The dipole patterns of anomalous precipitation events
were the most frequent in the twentieth century. NC experienced more floods in the cold periods than warm periods. Both NC
and the MLYRV experienced far fewer droughts and more floods in the warm eighteenth century when natural climate forcing dominated,
and more droughts in the twentieth century when anthropogenic forcing dominated. Coherent drought was the only spatial pattern
of precipitation significantly associated with explosive low-latitude volcanic eruptions. The increased coherent droughts
and dipole patterns in the twentieth century support the findings of previous modeling studies that the tropospheric aerosols
and human-induced land cover changes play important roles in the changes of summer rainfall over eastern China.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
This paper is a contribution to the AMIP-CMIP Diagnostic Sub-project on General Circulation Model Simulation of the East Asian
Climate, coordinated by W.-C. Wang. |
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| Keywords: | Anomalous precipitation events Drought Flood Spatial pattern Eastern China |
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