• 研究报告 •

### 辽东山区1960—2015年降水极值特征

1. (1沈阳农业大学农学院， 沈阳 110866;  2朝阳县气象局， 朝阳 122000； 3中国科学院清原森林生态系统观测研究站， 沈阳 110016;  4辽宁省气象局， 沈阳 110001)
• 出版日期:2017-08-10 发布日期:2017-08-10

### Extreme precipitation characteristics in eastern Liaoning mountainous region from 1960 to 2015.

LI Xiu-fen1,3, WANG Ping-hua2, LIU Jiang1*,   JIN Lei1， ZHAO Tong-bin4, SUN Ying-jie1, PENG Feng1, PAN Yu-hong1#br#

1. (1Agronomy College, Shenyang Agricultural University, Shenyang 110866, China; 2Meteorological Bureau of Chaoyang County, Chaoyang 122000, China; 3Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang 110016, China; 4 Liaoning Provincial Meteorological Bureau, Shenyang 110001, China).
• Online:2017-08-10 Published:2017-08-10

Abstract: In this paper, the daily precipitation data from 11 representative metrological stations in eastern Liaoning mountainous region during 1960-2015 were used to extract the maximum daily precipitation as the index. The spatialtemporal distribution characteristics of extreme precipitation in eastern Liaoning mountainous region during the past 56 years were analyzed, and the precipitation extremes in different reappearance periods were calculated by using EOF, SYM8 wavelet analysis, and optimal probability distribution model fitting methods. The results showed that (1) There were three extreme precipitation patterns in the studied region: the consistent pattern in all of the subregions, the pattern with consistency in the north and south but opposite in the middle, and the opposite pattern in the middle and both sides of mountains. The interannual oscillations of time coefficients for the three patterns were larger. (2) The extreme precipitation decreased slowly in the studied region before 1983, and then approached a stable value, showing obvious cycles of about 11 years and 20 years. The extreme precipitation difference between the southnorth area and the middle area decreased first and then increased, with oscillation cycles of about 11 years and 17 years. The difference between the middle and both sides of mountains approached a stable value before 1984, and then decreased slowly, with a most significant change cycle of 10 years. (3) From 11 representative meteorological stations, the fitting results with PearsonⅢ distribution was the best for 6 stations, lognormal distribution for 3 stations, and Gumbel distribution and Weibull distribution for the other 2 stations. (4) For various given reappearance periods, the theoretical extreme precipitation values of eastern Liaoning mountainous region had relatively large regional differences and they were generally higher in south than in north.