Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-20-5111-2020 |
A tropospheric pathway of the stratospheric quasi-biennial oscillation (QBO) impact on the boreal winter polar vortex | |
Yamazaki, Koji1,4; Nakamura, Tetsu1,4; Ukita, Jinro2; Hoshi, Kazuhira3 | |
2020-04-30 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:8页码:5111-5127 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The quasi-biennial oscillation (QBO) is quasiperiodic oscillation of the tropical zonal wind in the stratosphere. When the tropical lower stratospheric wind is easterly (westerly), the winter Northern Hemisphere (NH) stratospheric polar vortex tends to be weak (strong). This relation is known as the Holton-Tan relationship. Several mechanisms for this relationship have been proposed, especially linking the tropics with high latitudes through stratospheric pathway. Although QBO impacts on the troposphere have been extensively discussed, a tropospheric pathway of the Holton-Tan relationship has not been explored previously. Here, we propose a tropospheric pathway of the QBO impact, which may partly account for the Holton-Tan relationship in early winter, especially in the November-December period. The study is based on analyses of observational data and results from a simple linear model and atmospheric general circulation model (AGCM) simulations. The mechanism is summarized as follows: the easterly phase of the QBO is accompanied with colder temperature in the tropical tropopause layer, which enhances convective activity over the tropical western Pacific and suppresses it over the Indian Ocean, thus enhancing the Walker circulation. This convection anomaly generates a Rossby wave train, propagating into the midlatitude troposphere, which constructively interferences with the climatological stationary waves, especially in wavenumber 1, resulting in enhanced upward propagation of the planetary wave and a weakened polar vortex. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000531565400002 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; CIRCULATION ; MODULATION ; CONVECTION ; REVERSAL ; ATLANTIC ; PHASE ; WAVES |
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/248863 |
专题 | 地球科学 |
作者单位 | 1.Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido 0600810, Japan; 2.Niigata Univ, Fac Sci, Niigata 9502181, Japan; 3.Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan; 4.Hokkaido Univ, Arctic Res Ctr, Sapporo, Hokkaido 0010021, Japan |
推荐引用方式 GB/T 7714 | Yamazaki, Koji,Nakamura, Tetsu,Ukita, Jinro,et al. A tropospheric pathway of the stratospheric quasi-biennial oscillation (QBO) impact on the boreal winter polar vortex[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(8):5111-5127. |
APA | Yamazaki, Koji,Nakamura, Tetsu,Ukita, Jinro,&Hoshi, Kazuhira.(2020).A tropospheric pathway of the stratospheric quasi-biennial oscillation (QBO) impact on the boreal winter polar vortex.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(8),5111-5127. |
MLA | Yamazaki, Koji,et al."A tropospheric pathway of the stratospheric quasi-biennial oscillation (QBO) impact on the boreal winter polar vortex".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.8(2020):5111-5127. |
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