| Based on the theoretic and experiential formula,bilinear interpolation,Mann- Kendall and EOF,the NCEP2.5°×2.5°,NCEP1°×1°reanalysis data ,sound data and data of meteorological stations are analysed and the atmospheric precipitable water,water vapor transportation,net income and the relationship between rainfall and atmospheric precipitable water are discussed.The results show that:1. The atomspheric precipitable water calculated by NCEP reanalysis data is lower than that calculated by empirical formula in the spring,summer and autumn and multi-years,but the result in winter is reversal.2. There are two major areas which are Junngar Basin and western Tianshan accordingly in the distribution of atmospheric precipitable water.The atmospheric precipitable water in Tarim Basin is higher than that in Altay Mountains, Tianshan Mountains in central,eastern and low-value area of the Kunlun Mountains,though there does not exist high-value atmospheric precipitable water in Tarim Basin.The spatial distribution and maximum/minimum in atmospheric precipitable water in spring is similar to that in autumn.The maximum and minimum of atmospheric precipitable water are in summer and winter respectively.3. There are three atmospheric precipitable water modes in spring,summer and autumn and two in winter and multi-years accordingly.The main modes present accordant variations distribution over whole Xinjiang and converse variations distribution in South and North of Xinjiang.In the past 30 years,the first mode presents the remarkable increase,the second mode also presents the rise in winter but there are no change in summer and multi-years,there are decline in other seasons,which is similar to the third mode.4. Compared with rainfall,the result shows that there are lots of differences in the spatial distribution of rainfall and atmospheric precipitable water,which is the correspondence between the value of large areas of rainfall and that of small areas of atmospheric precipitable water.However, in the abrupt-change time,they are same.5. Compared with sounding data and NCEP1°×1°reanalysis data, NCEP2.5°×2.5°reanalysis data used to analyse the water vapor tansportation is appropriated in Xinjiang.6. The water vapour transportation in spring and autumn is mainly effected by three water conveyor belts,namely,the northwest wind direction moisture conveyor belt from Siberia and Mongolia, the southern Xinjiang southwest wind water vapor conveyor belt from Bay of Bengal inand a breakdown of water vapor from the Atlantic.There are two water conveyor belts,which come from western and northwester wind accordingly.In winter,the effect is mainly from western wind and the basin in southern Xinjiang is impacted on southwest warm airflow from Qinghai-Tibet Plateau.7. Before 1978's,the water vapour was supplied by meridional wind.And then due to the increase of the water vapour from west wind,the water vapor has been from meridional and zonal wind.And the meridional wind has made great contribution.Annually, 18801.1×10~8t water vapor inflood , 18256.4×10~8t water vapor pour and the net income is 544.6×10~8t.The net income in spring is the most and that in summer is the second,autumn is the only season whose water vapor is output from Xinjinag. |
PDF Full Text Request