关键词: 倒春寒, 气象指标, 等级

Abstract: Study on the meteorological index and grading of late spring coldness were carried out by using the disaster records of the late spring coldness in China and corresponding temperature data of meteorological stations from 1981 to 2000. Based on the analysis of the meteorological index and grading standard of late spring coldness all over the country, the index and grading are established by utilizing temperature departure and its duration. The newly built index was testified by contrasting the grading standards with the actually occurred of coldness in the six representative regions. The results show that the ratio of basically consistent between the new index and actual occurrence of the late spring coldness is 73%~100%, and the percentage of full compliance is 55%~100%. The index could define the cold of the late spring all over the country, which can reflect its course and quantitatively assess its occurrence level. The index is of important significance on meteorological disaster monitoring、evaluation and defense.

Key words: cold of the late spring, meteorological index, grade