Influence of El Niño‐Southern Oscillation in the mesosphere
Influence of El Niño‐Southern Oscillation in the mesosphere
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DOI：
10.1002/grl.50598
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发表时间：
2013-06
影响因子：
5.2
通讯作者：
Tao Li;N. Calvo;J. Yue;X. Dou;J. Russell;M. Mlynczak;C. She;X. Xue
中科院分区：
文献类型：
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作者：
Tao Li;N. Calvo;J. Yue;X. Dou;J. Russell;M. Mlynczak;C. She;X. Xue
使用2002年至2012年期间使用宽带发射辐射测量法探测大气卫星实验观测到的中层大气温度数据集，以及全大气共同体气候模式3.5版模拟的温度（WACCM3.5）1953年至2005年，研究了厄尔尼诺-南方涛动（ENSO）对北方半球（NH）冬季中层大气温度的影响。首次观测到中层中层冬季温度对ENSO的显著响应，热带地区异常变暖约为1.0 K/MEI（多变量ENSO指数），北半球中纬度地区异常变冷约为−2.0 K/MEI。观测到的中层温度对ENSO的响应与平流层相反，这与以前的模拟研究结果一致。SABER观测到的温度对ENSO的响应与WACCM3.5模式模拟的结果相似。分析WACCM3.5剩余平均纬向环流对ENSO的响应发现，暖ENSO事件期间，北半球中高纬度地区存在显著的上升流和热带中层的下降流，这主要是北半球中层异常的东向重力波强迫所驱动的。
Using the middle atmosphere temperature data set observed by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) satellite experiment between 2002 and 2012, and temperatures simulated by the Whole Atmospheric Community Climate Model version 3.5 (WACCM3.5) between 1953 and 2005, we studied the influence of El Niño‐Southern Oscillation (ENSO) on middle atmosphere temperature during the Northern Hemisphere (NH) wintertime. For the first time, a significant winter temperature response to ENSO in the middle mesosphere has been observed, with an anomalous warming of ~1.0 K/MEI (Multivariate ENSO Index) in the tropics and an anomalous cooling of ~ −2.0 K/MEI in the NH middle latitudes. The observed temperature responses to ENSO in the mesosphere are opposite to those in the stratosphere, in agreement with previous modeling studies. Temperature responses to ENSO observed by SABER show similar patterns to those simulated by the WACCM3.5 model. Analysis of the WACCM3.5 residual mean meridional circulation response to ENSO reveals a significant downwelling in the tropical mesosphere and upwelling in the NH middle and high latitudes during warm ENSO events, which is mostly driven by anomalous eastward gravity wave forcing in the NH mesosphere.