Journal Article10.1175/JCLI-D-15-0011.1
Observed Changes in the Distributions of Daily Precipitation Frequency and Amount over China from 1960 to 2013
TL;DR: In this paper, daily precipitation (P) records from 632 stations in China were homogenized and then applied to study the changes in the frequency of dry (P 5 0) and trace (0, P, 0.1mmday 21 ) days and all precipitation events (P $ 0.
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Abstract: In this study, daily precipitation (P) records for 1960‐2013 from 632 stations in China were homogenized and then applied to study the changes in the frequency of dry (P 5 0) and trace (0 , P , 0.1mmday 21 ) days and all precipitation events (P $ 0.1mmday 21 ), and the frequency and accumulated amount of precipitation at different intensities. Over China as a whole, very heavy precipitation (P $ 50mmday) events have increased significantly from 1960 to 2013, while light (0.1 # P , 10mmday 21 ) and moderate (10 # P , 25mmday 21 ) events have decreased significantly, accompanying the significant increases of dry days and decreases of trace days. This indicates a shift from light to intense precipitation, implying increased risks of droughtandfloodsoverChinasince1960.Althoughtheconsistentincreasesofdrydaysanddecreasesoftrace days and light and total precipitation days are seen over most of China, changes in other precipitation categories exhibit clear regional differences. Over the Yangtze River valley and southeast China, very heavy precipitation events have increased while light precipitation events have decreased. However, positive trends are seen for all precipitation categories over northwest China, while trends are generally negative over southwest, northeast, and northern China. To examine the association with global warming, the dependence of the precipitation change for each intensity category over China on global-mean temperature was analyzed using interannual to decadal variations. Results show that dry and trace days and very light and very heavy precipitation events exhibit larger changes per unit global warming than medium-intensity precipitation events.
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