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Spatio-temporal evolution characteristics of snowstorm in Shijiazhuang
YAN Fang, SUN Jingyi, FAN Junhong, YUE Yanxia, ZHAO Zhinan
Journal of Arid Meteorology    2021, 39 (06): 939-947.   DOI: 10.11755/j.issn.1006-7639(2021)-06-0939
Abstract428)   HTML7)    PDF(pc) (4668KB)(1956)       Save

Based on daily precipitation data of 17 national ground meteorological observation stations in Shijiazhuang since their establishment to 2019, the temporal and spatial characteristics of snowstorm days were analyzed, and the temporal variation characteristics of snowstorm days at 5 representative stations with different geographical environments were further analyzed by using Morlet wavelet analysis and sliding t-test methods. The results are as follows: (1) The snowstorm days decreased gradually from west to east in Shijiazhuang, and there were more snowstorm days in mountain area than in plain, and the urban area of Shijiazhuang was in a high value zone of snowstorm days. (2) The starting date of snowstorm in Shijiazhuang was October 31 at the earliest, and the ending date was April 19 at the latest. (3) From 1972 to 2019, there were 42 days of snowstorm at 17 stations, and greater than or equal to 3, 7 and 10 stations occurring snowstorm accounted for 57.1%, 35.7% and 26.2%, respectively. The snowstorm occurring in the whole region was only 4 days and accounted for 9.5%. (4) The percentage of snowstorm days since 2000 was the largest, and during 2005-2013, snowstorm occurred frequently. (5) The quasi-period and the first major period of snowstorm days in the whole time domain were both more than 10 years at each station, and it was in the period of less snowstorm after 2014 at five representative stations. (6) The time series of snowstorm days at 4 representative stations were abrupt. (7) The spatial distribution of maximum and average precipitation on snowstorm days in Shijiazhuang showed larger in mountain area than in the plain, and the large value center was in the urban area of Shijiazhuang.

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