江汉平原主要气候变化特征

根据江汉平原8个气象观测站1961年-2004年的气象资料，对该区气候变化特征进行分析，结果发现，该区年平均气温呈现上升趋势，气温增加倾向率为0．259℃／10a，平均最低气温有明显增加趋势而平均最高气温变化幅度不大；秋、冬两季气温上升明显；1993年是江汉平原气温突变年。该区年降水量呈现上升趋势，降水增加倾向率为42．39mm／10a；降水年际间变化明显，年际问变异系数和极值比分别为0．174和1．97；该区存在明显的3个连丰和2个连枯阶段。该区干燥度指数升高，气候向湿润化发展。该研究结果能够更好的指导该区农业生产和湿地保护，同时为政府部门决策提供气象依据.

The Characteristics of the Main Climate Change of Jianghan Plain

Based on the 1961 -2004 weather data of the 8 weather observation stations of Jianghan Plain,the analysis of the characteristics of the climate change of district gives a resuh that the average temperature tends to keep rising with the rate of 0.259℃/10 a. The average mini-mum temperature has visible ascending trend and the range of the change of the average maximum temperature is not too large. Autumn and winter temperatures rise significantly. Temperature had the abrupt change in 1993. The amount of annual precipitation tends to keep rising with the rate of 42.39 mm/10 a. The annual precipitation changes significantly ,and the coefficient of variation is 0.174. There are 3 obvious continuous rich rainfall stages and 2 continuous poor rainfall stages. The change of aridity index shows that the humidity degree was in-creased. The result of the study will guide the agricultural production and the wetland protection better. In addition, it can provide weather ha-sis to the decisions of the government.