Fine Spatial Distribution. Undulating Topography Of Chongqing Vapor Pressure

This paper studies the spatial distrihution of water vapor press in the mountain areas of ChongQing, with the month average data of water vapor press of climatic reorganized data including 34 meteorological observing stations in ChongQing and 4 around it from 1971 to 2000 and 7 meteorological sentries in it from 1997 to 1999, and 100mX 100m DEM of ChongQing. According to the theory of mountain climate and basing on GIS, it analysises the influencing factors to water vapor press decreasing coefficients in ChongQing, and studies the relations among water vapor press longitude latitude and sea level elevation, and founds the water vapor press spatial distribution model in ChongQing, and calculates the spatial distribution of the month average and the year average water vapor press in ChongQing, and completes the cartographies of the water vapor press spatial distribution of ChongQing.Geographical situation and sea level elevation are the main influencing factors to the spatial distribution of water vapor press. Water vapor press decreasing coefficients are different in different time. The mountain water vapor press decreases as a e index with the increasing of sea level elevation; the constant item and the once items of longitude and latitude are important to the spatial distribution of water vapor press; the twice items of longitude and latitude are less important to the spatial distribution of water vapor press.The month average and the year average water vapor press in ChongQing both show that: the water vapor press decreases with the increasing of sea level elevation; the water vapor press values in north-west and middle hill areas are middle and high; the water vapor press values in north-east and south-east mountain areas are relatively low. The sea level elevation in north-east and south-east mountain areas of ChongQing is higher, especially the north-east mountains are more rugged than the north-west mountains, and the decreasing of water vapor press with the increasing of sea level elevation is more distinct, so the lowest value often appears in the north-east mountains not in the north-west mountains. The seasonal change of water vapor press in ChongQing is also distinct: the values of water vapor press are lowmostly in winter, and the high values are relatively less; the values of water vapor press are middle and high mostly in summer, and the low values are relatively less, the values in spring and autumn are between them.