The importance of energetic particle precipitation on the chemical composition of the middle atmosphere
The importance of energetic particle precipitation on the chemical composition of the middle atmosphere
复制标题
高能粒子降水对中层大气化学成分的重要性
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Thorne
中科院分区：
文献类型：
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作者：
R. Thorne
评估了某些类型的高能粒子降水对中层大气化学组成的相对贡献，重点放在奇数氮和奇数氢的产生及其随后在催化臭氧去除中的作用。银河宇宙辐射是平流层下层奇数氮的重要来源，但由于能量沉积峰值发生在催化去除O3最有效的区域下方，因此这种机制在整个陆地臭氧收支中是否重要值得怀疑。高能太阳质子的沉淀可以周期性地在平流层上层产生显著的NO增强。NO在大气中这一区域的停留时间长，与O3的催化相互作用也最有效，这就要求将这一机制纳入未来的O3全球分布模型中。在整个中间层中，来自外辐射带（60°≤Λ≤70°）的高能电子的沉淀可以零星地作为奇氢和奇氮的主要局部来源，导致可观测到的O3耗竭。未来的卫星研究应着眼于同时测量降水通量和伴随的大气变化，这些结果应用于开发这种重要耦合的更复杂的模型。
An assessment is made of the relative contribution of certain classes of energetic particle precipitation to the chemical composition of the middle atmosphere with emphasis placed on the production of odd nitrogen and odd hydrogen species and their subsequent role in the catalytic removal of ozone. Galactic cosmic radiation is an important source of odd nitrogen in the lower stratosphere but since the peak energy deposition occurs below the region where catalytic removal of O3 is most effective, it is questionable whether this mechanism is important in the overall terrestrial ozone budget. The precipitation of energetic solar protons can periodically produce dramatic enhancement in upper stratospheric NO. The long residence time of NO in this region of the atmosphere, where catalytic interaction with O3 is also most effective, mandates that this mechanism be included in future modelling of the global distribution of O3. Throughout the mesosphere the precipitation of energetic electrons from the outer radiation belt (60°≲Λ≲70°) can sporadically act as a major local source of odd hydrogen and odd nitrogen leading to observable O3 depletion. Future satellite studies should be directed at simultaneously measuring the precipitation flux and the concomitant atmosphere modification, and these results should be employed to develop more sophisticated models of this important coupling.