Dynamics of 2013 Sudden Stratospheric Warming event and its impact on cold weather over Eurasia: Role of planetary wave reflection.
Dynamics of 2013 Sudden Stratospheric Warming event and its impact on cold weather over Eurasia: Role of planetary wave reflection.
复制标题
DOI：
10.1038/srep24174
复制
发表时间：
2016-04-07
影响因子：
4.6
通讯作者：
Wei K
中科院分区：
文献类型：
--
作者：
Nath D;Chen W;Zelin C;Pogoreltsev AI;Wei K
在本研究中，我们研究了 2013 年平流层突然变暖 (SSW) 事件期间平流层行星波反射对欧亚大陆中部对流层天气的影响。我们分析 EP 通量和垂直波活动通量，分别研究波传播的二维和三维方面。 2013 年 SSW 事件是由波数 1 (WN1) 和波数 2 (WN2) 行星波的综合影响激发的，这使得该事件成为一次不寻常的事件，似乎对对流层天气状况产生重大影响。我们在第一个发展阶段（2012 年 12 月最后一周）观察到西伯利亚苔原和北太平洋上空的海脊发生了异常的发展，随后在第二个发展阶段（2013 年 1 月的第一周）从北大西洋观察到了海脊的异常发展，这些波似乎是 SSW 期间 WN2 模式的激发的原因。波包向上传播，然后由于 SSW 事件引起的平流层上层极地急流产生强烈的负风切变，波包向下反射回欧亚大陆中部。向下传播的波浪导致欧亚大陆上空形成一个深槽，并在2013年1月中旬给哈萨克斯坦、俄罗斯南部和中国西北部带来了极端寒冷的天气。
In the present study, we investigate the impact of stratospheric planetary wave reflection on tropospheric weather over Central Eurasia during the 2013 Sudden Stratospheric Warming (SSW) event. We analyze EP fluxes and Plumb wave activity fluxes to study the two and three dimensional aspects of wave propagation, respectively. The 2013 SSW event is excited by the combined influence of wavenumber 1 (WN1) and wavenumber 2 (WN2) planetary waves, which makes the event an unusual one and seems to have significant impact on tropospheric weather regime. We observe an extraordinary development of a ridge over the Siberian Tundra and the North Pacific during first development stage (last week of December 2012) and later from the North Atlantic in the second development stage (first week of January 2013), and these waves appear to be responsible for the excitation of the WN2 pattern during the SSW. The wave packets propagated upward and were then reflected back down to central Eurasia due to strong negative wind shear in the upper stratospheric polar jet, caused by the SSW event. Waves that propagated downward led to the formation of a deep trough over Eurasia and brought extreme cold weather over Kazakhstan, the Southern part of Russia and the Northwestern part of China during mid-January 2013.