Climatology and trends of wet spells in China |
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Authors: | Aijuan Bai Panmao Zhai Xiaodong Liu |
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Institution: | (1) Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, P.R. China;(2) National Climate Center, Chinese Meteorological Administration, Beijing, P.R. China;(3) Shaaxi Meteorological Observatory, Xi’an, P.R. China;(4) Graduate School of Chinese Academy of Sciences, Beijing, P.R. China |
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Abstract: | Summary Climatological features and variations of wet spells, especially their trends over China, are investigated using a dataset
of 594 meteorological stations across China from 1951 to 2003. The results show that the lower the latitude is, the longer
the annual duration of wet spells is. The mean annual precipitation from wet spells is higher in southeastern coastal areas
and much lower in western and northern China. The longest wet spells are found in Southwest China and the eastern Tibetan
Plateau. The maximum daily precipitation of wet spells decreases from the southeast to the northwest, with the highest in
southeastern coastal areas and the lowest in western China. The trends of wet spells exhibit striking regional differences.
In most areas of western China, the annual number of days in wet spells has slightly increased, but significantly decreased
over North China, Central China and Southwest China. The annual precipitation amount from wet spells displays significant
downward trends in North China, eastern Northeast China and the eastern part of Southwest China, but upward trends in the
eastern Tibetan Plateau and some southeastern coastal areas. Two clearly-contrasting regions in climatic changes of wet spells
are the mid-lower reaches of the Yellow River and the eastern Tibetan Plateau, characterized by a decrease of about 24 days
and an increase of about 6 days in annual wet spell days from 1953 to 2003, respectively. |
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