Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0489.1 |
The Role of Zonal Asymmetry in the Enhancement and Suppression of Sudden Stratospheric Warming Variability by the Madden-Julian Oscillation | |
Kang, Wanying1; Tziperman, Eli1,2 | |
2018-03-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:6页码:2399-2415 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Sudden stratospheric warming (SSW) events influence the Arctic Oscillation and midlatitude extreme weather. Previous work showed the Arctic stratosphere to be influenced by the Madden-Julian oscillation (MJO) and that the SSW frequency increases with an increase of the MJO amplitude, expected in a warmer climate. It is shown here that the zonal asymmetry in both the background state and forcing plays a dominant role, leading to either enhancement or suppression of SSW events by MJO-like forcing. When applying a circumglobal MJO-like forcing in a dry dynamic core model, the MJO-forced waves can change the general circulation in three ways that affect the total vertical Eliassen-Palm flux in the Arctic stratosphere. First, weakening the zonal asymmetry of the tropospheric midlatitude jet, and therefore preventing the MJO-forced waves from propagating past the jet. Second, weakening the jet amplitude, reducing the waves generated in the midlatitudes, especially stationary waves, and therefore the upward-propagating planetary waves. Third, reducing the Arctic lower-stratospheric refractory index, which prevents waves from upward propagation. These effects stabilize the Arctic vortex and lower the SSW frequency. The longitudinal range to which the MJO-like forcing is limited plays an important role as well, and the strongest SSW frequency increase is seen when the MJO is located where it is observed in current climate. The SSW suppression effects are active when the MJO-like forcing is placed at different longitudinal locations. This study suggests that future trends in both the MJO amplitude and its longitudinal extent are important for predicting the Arctic stratosphere response. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427447000020 |
WOS关键词 | GENERAL-CIRCULATION MODELS ; ROSSBY-WAVE PROPAGATION ; NORTHERN-HEMISPHERE ; POLAR VORTEX ; EXTRATROPICAL RESPONSE ; BAROCLINIC ATMOSPHERE ; CLIMATE-CHANGE ; EL-NINO ; MJO ; TROPOSPHERE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/20962 |
专题 | 气候变化 |
作者单位 | 1.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 2.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA |
推荐引用方式 GB/T 7714 | Kang, Wanying,Tziperman, Eli. The Role of Zonal Asymmetry in the Enhancement and Suppression of Sudden Stratospheric Warming Variability by the Madden-Julian Oscillation[J]. JOURNAL OF CLIMATE,2018,31(6):2399-2415. |
APA | Kang, Wanying,&Tziperman, Eli.(2018).The Role of Zonal Asymmetry in the Enhancement and Suppression of Sudden Stratospheric Warming Variability by the Madden-Julian Oscillation.JOURNAL OF CLIMATE,31(6),2399-2415. |
MLA | Kang, Wanying,et al."The Role of Zonal Asymmetry in the Enhancement and Suppression of Sudden Stratospheric Warming Variability by the Madden-Julian Oscillation".JOURNAL OF CLIMATE 31.6(2018):2399-2415. |
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