Journal of Arid Meteorology

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Drought Research Based on the Circulation System in Land Surface Process


  1. 1. Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province/Chinese
     Meteorological Administration, Lanzhou Institute of Arid Meteorology of Chinese Meteorological Administration, Lanzhou 730020,  China;
     2. Chinese Academy of Meteorological Sciences, Beijing 10081, China
  • Online:2016-12-30 Published:2016-12-30



  1. 1.甘肃省/中国气象局干旱气候变化与减灾重点实验室,中国气象局兰州干旱气象研究所, 甘肃 兰州 730020;
    2.中国气象科学研究院,北京 100081
  • 作者简介:赵建华(1976-),男,宁夏中卫人,主要从事大气湍流、干旱与陆面过程研究.
  • 基金资助:



Drought is one of the natural disasters with the biggest losses and affecting most persons. In the land surface process, water usually transports from soil into plant and atmosphere in the daytime and then it partly reflows into soil at night. This water transporting process in soil, vegetable and atmosphere can be considered as a circuit and the three components of soil, vegetable and atmosphere linked with water flows comprise an open system in representation called circulation system. The meteorological drought, hydrological drought and agricultural drought except socioeconomic drought can be studied in a whole by using it, and drought is an external reflection of its inner contradiction movement of water. After the detailed analysis of the system, it shows that inner process, outer process and temperature-controlling  process is three important mechanisms to support the circulation system. Next, the thermal and dynamical water equations for the system and its each component, comprising three physical variables which are water content, water flux and heat quantity, are deduced in an uniform form. The equations for normal-state without drought or waterlogging and for abnormal-state with drought or waterlogging are deduced too. Finally, the theoretical analysis are also carried out to analyze the drought under the specified conditions such as constant water content, constant water flux, bare land without vegetable, land covered with dense vegetable and ceased water flows. The results are as follows:(1) For arid and semi-arid areas or bare land without vegetable, the trends to emerge drought depend on the signs of  which means water extraneous source differing from its normal-state value. (2) For wet area or dense-vegetable covering area, the trends to appear drought depend on signs of both  and  meaning the time partial derivative of water content difference from the normal state. At last, the building of drought index is discussed simply. In short, the drought can be systematically and quantitatively studied with the circulation system and thermal and dynamical water equations, which has an important significance for the basic theoretical search on drought, drought numerical model and drought’s forecast.

Key words:  drought, circulation system, inner and outer process, thermal and dynamical water equations of drought



关键词: 干旱, 回路系统, 内外过程, 水分热动力学方程组

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