关键词: 安徽沿淮地区, 梅雨特征, 时空分布, 趋势分析

Abstract: Based on the exploration of the characteristics of the plum rains spell (include the beginning date of the plum rains period, the end date of the plum rains period and plum period length),plum rains amount and plum rains intensity(include average daily figures of rainfall, the quotient of plum rains amount to annual amount, storm rainfall days during plum rains spell and intensity index of plum rains),the annual change characteristics of the plum rains spell,the plum rains amount and the plum rains intensity and others about plum rains amount and intensity of 11 stations were emphatically analyzed. The results are:1)The average plum rains spell is 24 days(the beginning date of the plum rains period is on June 16,the end date of plum rains period is on July 10),the plum rains amount is 221.9 mm, average daily figures of rainfall is 8.6 mm, the pluviometric quotient of plum rains amount to annual amount is 22.3%, the storm rainfall day is 1.3d, the intensity index of plum rains is 4.0 in the regions along Huaihe River in Anhui Province. 2) There is a trend of fluctuation in all of the items of plum rains character in the regions along Huaihe River.3) There is a nine-year fluctuation cycle in the items of plum rains character, and there are characteristics of decreasing amplitude and increasing frequency with the elapse of time. 4) The plum rains amount and intensity of 11 stations from west to east along Huaihe River in Anhui Province presents an "S-shaped" trend of "up-down-up". These results are of important referential values for the climatic research and weather forecast of the regions along Huaihe River.

Key words: regions along Huaihe River in Anhui, the characteristics of the plum rains, space-time distribution, trend analysis