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A Research on the North China Integrated Drought Assessment and Early Warning Technology

Zhang Wenzong \ Zhou Xuwen (Hebei Meteorological Bureau,Shijiazhuang 050021) Wang Xiaoyun (Beijing Meteorological Bureau,100081)  
A dynamic monitoring method of soil moisture in North China was described,according to heat inertia theory,and by using polar orbit satellite AVHRR data. Based on the synthetic analysis of soil moisture,rainfall,air temperature and assessment and early warning drought index suitable for North China during crop growing season was pointed out.The sensetivity and stability of integrated drought assessment and early warning system based on this index were improved significantly.
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