Abstract
Analyses of the spatio-temporal variability of precipitation extremes defined by eleven extreme precipitation indices in Shandong were conducted by utilizing the methods of linear regression, ensemble empirical mode decomposition (EEMD) and Mann–Kendall test. The results revealed that statistically significant decreasing trends existed for almost all extreme precipitation indices except for the consecutive dry days (CDD) and simple daily intensity index. A periodicity of 10–15 years for precipitation extremes is detected by EEMD analysis. Greatest 5-day total rainfall (RX5day), very wet days (R95p) and annual total wet-day precipitation (PRCPTOT) experienced decreasing trends in the region stretching from the southeast coast to the west, while the spatial distribution of the decreasing trends for other indices was more complicated. Moreover, the frequency of occurrence in precipitation extremes at Changdao station, surrounded by the sea in the northeast region, increased in contrast to surrounding stations. This may suggest a possible effect from the local marine environment on extreme precipitation. In addition, the stations with statistically significant positive trends for CDD were mainly located in mid-west Shandong and along the southeast coast, where the extreme precipitation and total rainfall were, on the contrary, characterized by decreasing trends. These results indicate that drought or severe drought events have become more frequent in those regions. Analysis of large-scale atmospheric circulation changes indicates that a strengthening anticyclonic circulation and increasing geopotential height as well as decreasing strength of monsoonal flow in recent decades may have contributed to the variations in extreme precipitation in Shandong.
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Acknowledgments
We are heartily grateful to two anonymous reviewers, because their comments significantly improved this paper. This study is supported by the Taishan Scholar Fund (No. 3000-841112013) awarded by Shandong Province, National Natural Science Foundation of China (No. 41210008; No. 41275050), Shandong Natural Science Foundation (No. ZR2015DQ004), Young Academic Backbone and PhD Research Fund as well as Culture Research Center of lower reaches of Yellow River in Heze University. We also thank He Meng and Xiang Gong in Ocean University of China for providing useful suggestions.
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Gao, T., Shi, X. Spatio-temporal characteristics of extreme precipitation events during 1951–2011 in Shandong, China and possible connection to the large scale atmospheric circulation. Stoch Environ Res Risk Assess 30, 1421–1440 (2016). https://doi.org/10.1007/s00477-015-1149-7
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DOI: https://doi.org/10.1007/s00477-015-1149-7