Surface Dryness/wetness State and Its Tendency in Henan Province for Last 40 Years

Based on monthly precipitation, mean monthly temperature and relative humidity of 75 (meteorological) stations in Henan Province from 1961 to 2000, the wetness index and the water budget in the surface are calculated. The results show that all stations are divided into 5 types with cluster analysis method. The wetness index and water deficiency over the surface has obvious difference in the five areas. The tendency of the wetness index over the surface declines slowly. The dryness trend properly results in the reduction of precipitation and the increase of temperature.

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