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中文摘要：
临近空间指高度位于（20～100）km之间的地球大气层．简要综述临近空间的已有了解和研究前沿，包括基本状态、主要过程与控制因子．介绍了基于已有探测资料的经验模式的建立和基于基本物理定量规律和数值模拟方法的中层大气环流和化学气候数值模拟．最后从临近空间大气环境保障应用角度提出研究的新建议．
英文摘要：
In recent years, the atmospheric layer in the altitude range of about 20-100km is called the near space layer by aeronautical and astronautical communities. Owing to rapid developments of technologies and applications related to this layer, there are more and more demands on deep understanding of atmospheric environments in this layer. Scientifically, this layer is called the middle atmospheric consisting of the stratosphere, mesosphere, and lower thermosphere, and each of these consecutive layers has its own characteristics of atmospheric state, composition and interactions with solar radiation and particulate activities. Since the atmospheric sounding in this layer is rather difficult, knowledge about this layer is relatively weak. In recent decades, more efforts have been paid to the exploration of this atmospheric layer by satellite and ground-based remote cesses sensing. empirical In this paper, we will briefly present the basic situation, major controlling factors and promodels of this layer, as well as dynamical-physical-chemical modeling and related numerical simulations. And finally some suggestions for advancing the application of near space environment are offered.
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A statistical study of sporadic sodium layer observed by Sodium lidar at Hefei (31.8 degrees N, 117.
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