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Model simulations of chemical effects of sprites in relation with observed HO 2 enhancements over sprite-producing thunderstorms

机译:用观察到的HO 2增强对孔雷暴相比,精灵化学效果模拟模拟

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Recently, measurements by the Superconducting Submillimeter-Wave Limb Emission Sounder (SMILES) satellite instrument have been presented which indicate an increase in mesospheric HO 2 above sprite-producing thunderstorms. The aim of this paper is to compare these observations to model simulations of chemical sprite effects. A plasma chemistry model in combination with a vertical transport module was used to simulate the impact of a streamer discharge in the altitude range 70–80? km , corresponding to one of the observed sprite events. Additionally, a horizontal transport and dispersion model was used to simulate advection and expansion of the sprite air masses. The model simulations predict a production of hydrogen radicals mainly due to reactions of proton hydrates formed after the electrical discharge. The net effect is a conversion of water molecules into H+OH . This leads to increasing HO 2 concentrations a few hours after the electric breakdown. Due to the modelled long-lasting increase in HO 2 after a sprite discharge, an accumulation of HO 2 produced by several sprites appears possible. However, the number of sprites needed to explain the observed HO 2 enhancements is unrealistically large. At least for the lower measurement tangent heights, the production mechanism of HO 2 predicted by the model might contribute to the observed enhancements.
机译:最近,已经介绍了超导亚峰值波肢发射探测器(微笑)卫星仪器的测量,这表明伴有薄膜产生雷暴的Mesompheric Ho 2的增加。本文的目的是比较这些观察,以模拟化学精灵效应的模拟。使用与垂直传输模块的组合等离子体化学模型来模拟在高度范围70-80中的飘带放电的影响? KM,对应于观察到的精灵事件之一。另外,水平传输和分散模型用于模拟精灵空气质量的平流和扩展。模型模拟预测氢自由基的产生主要是由于在放电后形成的质子水合物的反应。净效应是将水分子转化为H + OH。这导致电击后几个小时增加HO 2浓度。由于在深度放电后HO 2的模型长持续增加,可能似乎由几个精灵产生的HO 2的积累。然而,解释观察到的HO 2增强所需的精灵的数量是不切实际的。至少对于较低的测量切线高度,模型预测的HO 2的生产机制可能有助于观察到的增强功能。

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