Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-20-6541-2020 |
On the forcings of the unusual Quasi-Biennial Oscillation structure in February 2016 | |
Li, Haiyan1,2,3,4; Kedzierski, Robin Pilch3; Matthes, Katja3,5 | |
2020-06-05 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:11页码:6541-6561 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Germany |
英文摘要 | The westerly phase of the stratospheric Quasi-Biennial Oscillation (QBO) was reversed during Northern Hemisphere winter 2015/2016 for the first time since records began in 1953. Recent studies proposed that Rossby waves propagating from the extratropics played an important role during the reversal event in 2015/2016. Building upon these studies, we separated the extratropical Rossby waves into different wavenumbers and timescales by analyzing the combined ERA-40 and ERA-Interim reanalysis zonal wind, meridional wind, vertical velocity, and potential vorticity daily mean data from 1958 to 2017. We find that both synoptic and quasi-stationary Rossby waves are dominant contributors to the reversal event in 2015/2016 in the tropical lower stratosphere. By comparing the results for 2015/2016 with two additional events (1959/1960 and 2010/2011), we find that the largest differences in Rossby wave momentum fluxes are related to synoptic-scale Rossby waves of periods from 5 to 20 d. We demonstrate for the first time, that these enhanced synoptic Rossby waves at 40 hPa in the tropics in February 2016 originate from the extratropics as well as from local wave generation. The strong Rossby wave activity in 2016 in the tropics happened at a time with weak westerly zonal winds. This coincidence of anomalous factors did not happen in any of the previous events. In addition to the anomalous behavior in the tropical lower stratosphere in 2015/2016, we explored the forcing of the unusually long-lasting westerly zonal wind phase in the middle stratosphere (at 20 hPa). Our results reveal that mainly enhanced Kelvin wave activity contributed to this feature. This was in close relation with the strong El Nino event in 2015/2016, which forced more Kelvin waves in the equatorial troposphere. The easterly or very weak westerly zonal winds present around 30-70 hPa allowed these Kelvin waves to propagate vertically and deposit their momentum around 20 hPa, maintaining the westerlies there. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000538583100004 |
WOS关键词 | GRAVITY-WAVES ; QBO ; ENSO ; MECHANISM ; MODULATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/273255 |
专题 | 地球科学 |
作者单位 | 1.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Guangdong, Peoples R China; 2.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Zhuhai, Guangdong, Peoples R China; 3.GEOMAR Helmholtz Ctr Ocean Res Kiel, Marine Meteorol Dept, Kiel, Germany; 4.Southern Lab Ocean Sci & Engn, Zhuhai, Peoples R China; 5.Christian Albrechts Univ Kiel, Fac Math & Nat Sci, Kiel, Germany |
推荐引用方式 GB/T 7714 | Li, Haiyan,Kedzierski, Robin Pilch,Matthes, Katja. On the forcings of the unusual Quasi-Biennial Oscillation structure in February 2016[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(11):6541-6561. |
APA | Li, Haiyan,Kedzierski, Robin Pilch,&Matthes, Katja.(2020).On the forcings of the unusual Quasi-Biennial Oscillation structure in February 2016.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(11),6541-6561. |
MLA | Li, Haiyan,et al."On the forcings of the unusual Quasi-Biennial Oscillation structure in February 2016".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.11(2020):6541-6561. |
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