Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-20-0039.1 |
Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009 | |
Song, Byeong-Gwon; Chun, Hye-Yeong; Song, In-Sun | |
2020-10-01 | |
发表期刊 | Journal of the Atmospheric Sciences
![]() |
出版年 | 2020 |
英文摘要 | The role of gravity waves (GWs) in a sudden stratospheric warming (SSW) event that occurred in January 2009 (SSW09) is investigated using the MERRA-2 dataset. Nearly 2 weeks prior to the central date (lag = 0), at which the zonal-mean zonal wind at 10 hPa and 60°N first becomes negative, westward GW drag (GWD) is significantly enhanced in the lower mesosphere and stratosphere. At 5 days before lag = 0, planetary waves (PWs) of zonal wavenumber 2 (ZWN-2) in the stratosphere are enhanced, while PWs of ZWN-1 are weakened, which are evident from the amplitudes of the PWs and their Eliassen–Palm flux divergence (EPD). To examine the relationship between PWs and GWs, a nonconservative GWD (NCGWD) source term of the linearized quasigeostrophic potential vorticity equation is considered. A ZWN-2 pattern of the NCGWD forcing is developed around z = 55–60 km with a secondary peak around z = 40 km just before the PWs of ZWN-2 in the stratosphere began to enhance. A significant positive correlation between the NCGWD forcing in the upper stratosphere and lower mesosphere (USLM; 0.3–0.1 hPa in the present data) and the PWs of ZWN-2 in the stratosphere (5–1 hPa) exists. This result demonstrates that the amplification of the PWs of ZWN-2 in the stratosphere before the onset of SSW09 is likely related to the generation of PWs by GWD in the USLM, which is revealed by the enhanced downward-propagating PWs of ZWN-2 into the stratosphere from above. |
领域 | 地球科学 ; 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/296366 |
专题 | 地球科学 气候变化 |
推荐引用方式 GB/T 7714 | Song, Byeong-Gwon,Chun, Hye-Yeong,Song, In-Sun. Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009[J]. Journal of the Atmospheric Sciences,2020. |
APA | Song, Byeong-Gwon,Chun, Hye-Yeong,&Song, In-Sun.(2020).Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009.Journal of the Atmospheric Sciences. |
MLA | Song, Byeong-Gwon,et al."Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009".Journal of the Atmospheric Sciences (2020). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论