ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Climatological Variability of Cold Air Processes over China in Recent 60 Years
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Abstract:
By virtue of the daily temperature observations of 2 〖KG-*5〗400 stations in China from 1960 to 2019, the climatological characteristics of the cold event in China are systematically analyzed. The results show that the cold wave and cold air process in China mainly occur in autumn, winter and spring, and the frequency and intensity have obvious monthly and seasonal differences. Regional cold wave has the highest frequency in autumn, and national cold wave and all types 〖JP2〗of cold air have the highest frequency in winter. The average〖JP〗 intensity of regional cold event is the largest in February, and the average intensity of national cold event is the largest in November. Based on the analysis of winter temperature in China, the past 60 years can be divided into two stages, that is, the cold period from 1960 to 1986 and the warm period from 1987 to 2019. In the winter of cold period, the frequency of the national cold wave shows a significant decrease trend ［-0.57 times·（10 a）-1］, and the frequency of regional cold air and alltype (the sum of national type and regional type) cold air processes in winter shows a significant upward trend of 1.37 times·（10 a）-1 and 1.28 times·（10 a）-1, respectively. In the warm period, there is a significantly decreasing trend of national cold wave frequency ［-0.17 times·（10 a)-1］ and a significantly increasing trend of regional cold air frequency ［0.53 times·（10 a）-1］ in January.
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