| Cite this article: | 吴舒祺,么嘉棋,候文星,等.太湖流域降水变化及与组合大气环流的关系[J].灌溉排水学报,2022,():-. |
| Wu Shuqi,Yao Jiaqi,Hou wenxing,et al.太湖流域降水变化及与组合大气环流的关系[J].灌溉排水学报,2022,():-. |
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| DOI： |
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| Variation of precipitation in the Taihu Lake Basin and its relationship with the combined atmospheric circulation |
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Wu Shuqi1, Yao Jiaqi2, Hou wenxing1, A Duo3, Zhao Wenji1
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1.College of Resource Environment and Tourism,Capital Normal University;2.College of Geodesy and Geomatics,Shandong University of Science and Technology;3.National Disaster Reduction Center of China
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| Abstract: |
| [Objective]To study regional precipitation variation and its multi-scale effects with atmospheric circulation. [Method]Using MK (Mann Kendall), MMK (Modified Mann Kendall), wavelet coherence (WTC), multiple wavelet coherence (MWC) to analyze changes of precipitation at 30 meteorological stations in the Taihu Lake Basin(TLB) from 1960 to 2020 and the multi-scale oscillations with single and combined atmospheric circulation. [Result]The main results are as follows: (1) The spatial distributions of the trend values ??of MMK and MK are similar in the annual and seasonal scale, but significance differs. The annual precipitation in TLB has the largest upward trend, while precipitation in winter had the smallest upward trend. MMK can detect significance that MK does not, especially for spring precipitation. (2) The WTC showed that precipitation and atmospheric circulation had a complex nonlinear relationship, but there were notable differences across various time domains.(3) Of all single variables, the EASM was the most influential teleconnection in the TLB. Among the multivariate combinations, Prep-AO-PDO-ENSO-EASM-DMI had the greatest impact on precipitation. [Conclusion]The dominant tele-correlation alone cannot explain the relationship between precipitation and atmospheric circulation, and the combination of atmospheric circulation with the highest percentage of significant power (POPS) can be used as the best combination to explain precipitation changes. |
| Key words: MMK trend test method; multi-wavelet coherence; combined atmospheric circulation; multi-scale effect; percentage of significant power |
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