Gravity waves in the thermosphere during a sudden stratospheric warming
Gravity waves in the thermosphere during a sudden stratospheric warming
复制标题
平流层突然变暖期间热层中的重力波
DOI：
10.1029/2012gl053812
复制
发表时间：
2012
影响因子：
5.2
通讯作者：
A. S. Medvedev
中科院分区：
文献类型：
--
作者：
E. Yiğit;A. S. Medvedev
本文首次研究了平流层突然增暖时低层大气重力波向湍流顶热层的传播。该研究是利用耦合中层大气-热层大气环流模式和Yiiquit等人（2008年）实施的光谱GW参数化进行的。模拟结果显示，一个强大的调制SSWs的GW活动，动量沉积率，并在高度上的热层（10270公里）的环流反馈。波浪引起的均方根风波动在湍流顶上方变暖期间增加了三倍。这主要是由于较弱的平流层急流减少了向东传播的谐波。与标称条件相比，这些GW谐波传播到更高的高度，并且当它们消散时，对热层中的平均流有更大的影响。SSW生命周期期间平流层和中间层风的演变在GW活动和湍流层顶上方300公里的热层中的平均场中产生了强大而独特的响应。
We examine for the first time the propagation of gravity waves (GWs) of lower atmospheric origin to the thermosphere above the turbopause during a sudden stratospheric warming (SSW). The study is performed with the Coupled Middle Atmosphere‐Thermosphere general circulation model and the implemented spectral GW parameterization of Yiğit et al. (2008). Simulations reveal a strong modulation by SSWs of GW activity, momentum deposition rates, and the circulation feedbacks at heights up to the upper thermosphere (∼270 km). Wave‐induced root mean square wind fluctuations increase by a factor of three during the warming above the turbopause. This occurs mainly due to a reduction of filtering eastward traveling harmonics by the weaker stratospheric jet. Compared to nominal conditions, these GW harmonics propagate to higher altitudes and have a larger impact on the mean flow in the thermosphere, when they are dissipated. The evolution of stratospheric and mesospheric winds during an SSW life‐cycle creates a robust and distinctive response in GW activity and mean fields in the thermosphere above the turbopause up to 300 km.
登录
查看更多内容
影响因子：
--
作者：
Ling Wang;M. Alexander
通讯作者：
Ling Wang;M. Alexander
影响因子：
--
作者：
Erdal Yiğit;A. Medvedev;A. Aylward;P. Hartogh;M. Harris
通讯作者：
Erdal Yiğit;A. Medvedev;A. Aylward;P. Hartogh;M. Harris
影响因子：
5.2
作者：
A. Medvedev;Erdal Yiğit
通讯作者：
A. Medvedev;Erdal Yiğit
影响因子：
--
作者：
Erdal Yiğit;A. Medvedev
通讯作者：
Erdal Yiğit;A. Medvedev
DOI：
10.1016/j.jastp.2011.11.014
发表时间：
2012
影响因子：
1.9
作者：
Erdal Yiğit;A. Medvedev;A. Aylward;A. Ridley;M. Harris;M. Moldwin;P. Hartogh
通讯作者：
P. Hartogh