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| Spatial and Temporal Changes of Atmospheric Precipitable Water in the Eastern Part of Northwest China from 1981 to 2010 |
| Ma Xinping1,2, Shang Kezheng1, Li Jiayun1, Wang Jiayuan1, Kang Yanzhen1, Wang Shigong1 |
1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
2. Unit 93868 of PLA, Yinchuan 750025, China |
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Abstract Based on the NCEP/NCAR reanalysis data and daily precipitation and evaporation data at 58 meteorological stations from 1981 to 2010, authors adopt a new method to analyze the spatial and temporal distributions of atmospheric precipitable water in the east part of northwest China. In addition, the correlation of atmospheric precipitable water and precipitation are also analyzed. The results show that the atmospheric precipitable water is unevenly distributed in the east part of northwest China both for annual total and in four seasons, which is gradually decreasing from southeast to northwest. Besides, the precipitable water present a slight decreasing trend in the east part of northwest China and the reducing rate is different from season to season in the recent 30 years. The precipitation distribution is similar to the atmospheric precipitable wate. It also showed a trend of weak reduction in the studied area. In addition, the actual precipitation is significantly and positively related with the atmospheric precipitable water, and the correlation coefficient is maximum in spring and minimum in summer. The correlation of precitpitation and the atmospheric precipitable water in different regions is rather complex, for it changes along with the season. In general, the correlation is higher in the east and south Gansu and the central and south Shaanxi. It would be more accurate and truthful to combine the atmospheric precipitable water with the rainy days to assess precipitable water.
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Received: 21 January 2014
Published: 20 March 2015
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2015, Vol. 35 
