Energetic particle precipitation (EPP) is known to be an important source of chemical changes in the polar middle atmosphere in winter. Recent modeling studies further suggest that chemical changes induced by EPP can also cause dynamic changes in the middle atmosphere. In this study, we investigated the atmospheric responses to the precipitation of medium-to-high energy electrons (MEEs) over the period 2005–2013 using the Specific Dynamics Whole Atmosphere Community Climate Model (SD-WACCM). Our results show that the MEE precipitation significantly increases the amounts of NO_x and HO_x, resulting in mesospheric and stratospheric ozone losses by up to 60% and 25% respectively during polar winter. The MEE-induced ozone loss generally increases the temperature in the lower mesosphere but decreases the temperature in the upper mesosphere with large year-to-year variability, not only by radiative effects but also by adiabatic effects. The adiabatic effects by meridional circulation changes may be dominant for the mesospheric temperature changes. In particular, the meridional circulation changes occasionally act in opposite ways to vary the temperature in terms of height variations, especially at around the solar minimum period with low geomagnetic activity, which cancels out the temperature changes to make the average small in the polar mesosphere for the 9-year period.

中文翻译：

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数值模型模拟对中等能量电子（MEE）降水的极中大气响应

高能粒子沉淀（EPP）是冬季冬季极地中间大气化学变化的重要来源。最近的模型研究进一步表明，EPP引起的化学变化也可以引起中间大气的动态变化。在这项研究中，我们使用特定动力学整体大气共同体气候模型（SD-WACCM）研究了2005年至2013年期间大气对中高能电子（MEE）降水的响应。我们的结果表明，MEE沉淀显着增加了NO _x和HO _x的含量，导致极地冬季的中层和平流层臭氧损失分别高达60％和25％。由MEE引起的臭氧损失通常会增加下中层温度，但会降低上中层温度，并且逐年变化很大，不仅是辐射效应，而且是绝热效应。经线环流变化的绝热效应可能是中层温度变化的主要因素。特别是子午环流变化有时会以相反的方式根据高度变化来改变温度，尤其是在地磁活动低的太阳最短周期附近，这抵消了温度变化，从而使极地中层的平均温度变小了。 9年期限。