Southern Hemisphere Summer Mesopause Responses to El Niño–Southern Oscillation
Southern Hemisphere Summer Mesopause Responses to El Niño–Southern Oscillation
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DOI：
10.1175/jcli-d-15-0816.1
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发表时间：
2016-08
影响因子：
4.9
通讯作者：
Tao Li;N. Calvo;J. Yue;J. Russell;Anne K. Smith;M. Mlynczak;A. Chandran;X. Dou;A. Liu
中科院分区：
文献类型：
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作者：
Tao Li;N. Calvo;J. Yue;J. Russell;Anne K. Smith;M. Mlynczak;A. Chandran;X. Dou;A. Liu
摘要在南半球极区，卫星观测显示12月暖性ENSO事件期间，中上层明显变冷，低层明显变暖。在热带中层顶区则观察到相反的模式。观测到的中高层变冷与气候模式模拟结果一致。模拟分析表明，厄尔尼诺期间北半球高纬度平流层行星波耗散增强，增强了布鲁尔-多布森环流，使赤道平流层变冷。这增加了SH平流层经向温度梯度的大小，从而引起平流层偏东纬向风的异常和SH平流层极涡的早期破裂。由此引起的重力波（GW）滤波扰动导致SH中层异常的东向重力波强迫和极地上升流和冷却。此外，ENSO和准双年振荡（QBO）的建设性推断可能导致st。
AbstractIn the Southern Hemisphere (SH) polar region, satellite observations reveal a significant upper-mesosphere cooling and a lower-thermosphere warming during warm ENSO events in December. An opposite pattern is observed in the tropical mesopause region. The observed upper-mesosphere cooling agrees with a climate model simulation. Analysis of the simulation suggests that enhanced planetary wave (PW) dissipation in the Northern Hemisphere (NH) high-latitude stratosphere during El Nino strengthens the Brewer–Dobson circulation and cools the equatorial stratosphere. This increases the magnitude of the SH stratosphere meridional temperature gradient and thus causes the anomalous stratospheric easterly zonal wind and early breakdown of the SH stratospheric polar vortex. The resulting perturbation to gravity wave (GW) filtering causes anomalous SH mesospheric eastward GW forcing and polar upwelling and cooling. In addition, constructive inference of ENSO and quasi-biennial oscillation (QBO) could lead to st...