淮河流域大气中水汽含量的时空变化特征

Based on the NCEP/NCAR reanalysis data for 1954-2007, a analysis of the temporal and spatial characteristics of the annual and each season mean water vapor content in Huaihe River Basin is made. As the results, with the latitude increasing, the vapor content becomes decreasing and the distribution of the vapor content in each season is different. From winter to summer, the vapor content is increasing while from summer to winter, the vapor content is decreasing. The annual mean vapor content varies significently year by year. From the middle of 50s in 20th century to the middle of 70s, there exists higher vapor content and from the middle of 70s to 21th ,there exists lower vapor content. The vapor content in winter varied tenderly year by year and shows a decreasing tendency in spring. In summer, there exists higher vapor content and lower vapor content alternately, but there exists lower vapor content in the middle of 90s to 21th in autumn.