The Interrelationship between Regional Westerly Index and the Water Vapor Budget in Northwest China
Based on the monthly data of NCEP/ NCAR in the period of 1951-1999, with a resolution of 2. 5°×2. 5°, the average transportation and budget of water vapor in Northwest China are analyzed. It is found that the water vapor transportation concentrates in summer, the westerly is the main carrier, the Atlantic, the Arctic Ocean, the Black Sea and the Caspian Sea are the main water vapor sources, and the most part of the water vapor transported to Northwest China continuously moves eastwards and exports across the east sideline. Since westerly is the main carrier of water transportation in Northwest China, and the maxi- mum of water vapor transportation appears in summer, summer is chosen for further research. Analyzing the designed regional westerly indexes, the research shows that the regional westerly index is a very good index for studying both the westerly water vapor transportation and budget of the water vapor transportation in Northwest China: in summer, a larger (smaller) index indicates that more (less) water vapor is transported to Northwest China by the westerly, and also, the budget of water vapor is more (less), resulting in more (less) precipitation.
NETL
NSTL
万方数据
维普
