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| Spatial-temporal Distribution of Summer Cloud Water Resources over the Loess Plateau from 1979 to 2012 |
| Pan Liujie1, Zhang Hongfang2, Zhou Yuquan3, Ning Zhiqian4, Zhang Kexiang1, Wang Congjun5 |
1. Shaanxi Meteorological Observatory, Xi'an 710014, China;
2. Shaanxi Meteorological Service Centre, Xi'an 710014, China;
3. Chinese Academy of Meteorological Sciences, Beijing 100081, China;
4. Shaanxi Meteorological Bureau, Xi'an 710014, China;
5. Ziyang Meteorological Bureau, Ziyang 725300, Shaanxi, China |
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Abstract Spatial and temporal distribution features of cloud water resources over the Loess Plateau in summer from 1979 to 2012 were analyzed by using ERA-Interim dataset issued by European Centre for Medium-Range Weather Forecasts (ECMWF). Results are the following: (1) There are much more cloud water resources than the actual amount of precipitation in summer, leaving a great potential for cloud water resources exploitation.(2) The distribution of cloud water resources shows two main modes: firstly, anti-phase oscillation appears between the northwest and the southeast(EOF1); secondly, cloud water resources are abundant in the center of the Loess Plateau, while they are not enough in the northwest and the southeast regions(EOF2); The associated time series of EOF1 and EOF2 also show significant inter-annual cycle. (3) The cloud water resources over the Loess Plateau come from the East China Sea, and when the center location of the water vapor transports anticyclonic circulation southerly (northerly), the spatial mode EOF1 (EOF2) is influenced. (4) The amount of cloud water and cloud ice reach the peak value at about 700 hPa and 400 hPa, respectively. It is benefit to exploitation of cloud water resources that the appearance of the water vapors convergence and the upward motion at 700 hPa.
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Received: 26 February 2014
Published: 20 March 2015
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2015, Vol. 35 
