Evidence for stratospheric sudden warming effects on the upper thermosphere derived from satellite orbital decay data during 1967–2013
Evidence for stratospheric sudden warming effects on the upper thermosphere derived from satellite orbital decay data during 1967–2013
复制标题
从 1967-2013 年卫星轨道衰变数据得出的平流层突然变暖对上层热层影响的证据
DOI：
10.1002/2015gl065395
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发表时间：
2015
影响因子：
5.2
通讯作者：
J. Emmert
中科院分区：
文献类型：
--
作者：
Y. Yamazaki;M. Kosch;J. Emmert
利用1967-2013年卫星轨道阻力得到的全球平均热层总质量密度的长期数据，研究了平流层突然变暖（SSW）对热层的可能影响。对数据和经验全球平均质量密度模型（GAMDM）之间的残差进行分析，该模型考虑了太阳活动、季节、地磁活动和长期趋势引起的密度变化。对3 - 7个SSW事件的叠加历元分析表明，极涡最大减弱前后，250-575 km处的密度降低了3-7%。相对密度扰动被认为是更大的在较高的海拔高度。在400公里处的温度扰动估计为-7.0 K。我们表明，密度减少可以引起从低层大气的波强迫增强。
We investigate possible impact of stratospheric sudden warmings (SSWs) on the thermosphere by using long‐term data of the global average thermospheric total mass density derived from satellite orbital drag during 1967–2013. Residuals are analyzed between the data and empirical Global Average Mass Density Model (GAMDM) that takes into account density variability due to solar activity, season, geomagnetic activity, and long‐term trend. A superposed epoch analysis of 37 SSW events reveals a density reduction of 3–7% at 250–575 km around the time of maximum polar vortex weakening. The relative density perturbation is found to be greater at higher altitudes. The temperature perturbation is estimated to be −7.0 K at 400 km. We show that the density reduction can arise from enhanced wave forcing from the lower atmosphere.
影响因子：
5.2
作者：
E. Yiğit;A. S. Medvedev
通讯作者：
A. S. Medvedev