| 天气与气候 |
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| Climate Characteristics of Atmospheric Precipitable Water over Xinjiang and Its Variation |
| SHI Yu-guang1,2, SUN Zhao-bo1 |
| 1.Nanjing University of Information Science and Technology, Nanjing 210044, China; 2.Xinjiang Meteorological Bureau, Urumqi 830002, China |
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Abstract Using the daily NCEP/NCAR reanalysis data from 1961 to 2000, the features and variation trends of seasonal atmospheric precipitable water (APW) over Xinjiang region are analyzed. The results show that in summer the APW over Xinjiang is less than 25 mm—the APW limit of monsoon areas, indicating that Xinjiang is not in monsoon area. Over Tarim Basin and Junggar Basin there are the high APW,the low APW over high altitude Altay Mountains, Tianshan Mountains and Karakorum Mountains. The APW in summer is the maximum but less than the APW of eastern monsoon areas in the same latitude, that in spring and autumn is the second and that in winter is the minimum, and close to the APW of eastern monsoon areas in the same latitude. The APW distribution is opposite with the distribution of rainfall, the maximal(minimal) APW regions correspond to the minimal(maximal) rainfall regions. Influenced by westerly circulation the APW modes present accordant variations and steady distribution over whole Xinjiang area, showing prominent different from rainfall modes. The APW in Xinjiang had not obvious change trend in the last 40 years, indicating that the rainfall difference in Xinjiang is not mainly caused by the diversity of water vapor content, but by the diversity of dynamics condition, water vapor convergence and other factors.
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Received: 20 October 2007
Published: 20 May 2008
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2008, Vol. 28 
