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Analysis of Water Vapor Characteristic and Precipitation Potentiality over Dongjiang Reservoir in Hunan

ZHANG Zhong-bo et al (Hunan Weather Modification Office,Changsha,Hunan 410007)  
Using sounding data observed everyday at 08 and 20 o'clock at Chenzhou and surface rainfall data of meteorological stations at Chenzhou,Guidong,Zixing,Rucheng during 1995 to 2004,monthly water vapor content was calculated and analyzed by traditional atmosphere differential method as well as its exchange times,renewal rate,total flux and precipitation potentiality.The results showed that the yearly water vapor content over Dongjiang area was 3.79 g/cm2,with its maximum being 6.35 g/cm in July and minimum being 2.02 g/cm2 in December.As for seasonal change,it was 5.53 g/cm2 in summer,which was the most abundant in the whole year,following with that in spring.And the least was in winter.In spring water vapor renewal rate was only 6.6 d,which was the fastest.The difference between the total water vapor flux and total precipitation was obvious in summer(from June to August).If all potential clouds over reservoir were seeded in this period,about 117-294 million ton water could reached in Dongjiang Reservoir.
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