The analysis of the extreme precipitation features in Linfen area under the background of global warming

• 1、College of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044

Abstract：Based on the data of daily precipitation of 17 weather stations from 1977 to 2010 in Linfen area, using R95P method to calculate the threshold of the Linfen extreme precipitation in different regions as the standard of extreme precipitation events of Linfen area. Using ArcGIS analysis daily and monthly extreme precipitation of different regions in Linfen, the results show that Linfen region of extreme precipitation threshold overall and altitude were positively correlated, the relationship between the number of occurrences of summer extreme precipitation events, most winter minimum, and using Mann-Kendall test different regions mutation of extreme precipitation events, the mutation change trend of annual extreme precipitation days in eastern Linfen from 1990 to 1990; the central regions Linfen plains in the change of extreme precipitation events mutations in 1985; In the western region the mutation is during 1996 and 1999. The mutation is roughly the number of extreme precipitation in July month occurred in the late 1990s; The number of extreme precipitation month in August mutated in 1993; Number of extreme precipitation month in September mutated occurred in 1983; Results show that under the background of global warming in both daily extreme precipitation events and monthly extreme precipitation events are presenting a growth trend Linfen area.

Keywords： Urban meteorology Extremely precipitation Threshold value Linfe area R95p method