Abstract:

Based on the data of the daily mean temperature and minimum temperature of 77 meteorological stations in Anhui province during 1960-2012, the spatiotemporal distribution and interannual variation of cold wave in Anhui province were analyzed with linear trend, the climate trend rate and wavelet analysis method.Also in three different baseline periods，the variation of average beginning and ending date of cold wave were analyzed.These studies complemented and perfected the climatic characteristics of cold wave in Anhui，and could improve the service capacity of meteorological disaster prevention and mitigation.The results showed that there were obvious differences on spatial distribution of cold wave frequency.More cold waves occurred in north mountain areas in recent 52 years in Anhui province.There were three significant periods: 22 years about, 10 to 12 years and six years or so.The average beginning date of the cold wave in each station in Anhui postponed from north to south，and the situation of the average ending date was similar.Cold wave occurred mainly in wintertime from February to March and November to December.The interannual variation of cold wave was great，and tended to decrease in the annual frequency.The average beginning date of cold wave tended to postpone，while its end date advanced.The global warming may be the possible reason for the climate change of cold wave in Anhui