Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-19-6535-2019 |
A numerical process study on the rapid transport of stratospheric air down to the surface over western North America and the Tibetan Plateau | |
Skerlak, Bojan1; Pfahl, Stephan1,2; Sprenger, Michael1; Wernli, Heini1 | |
2019-05-17 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:9页码:6535-6549 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Germany |
英文摘要 | Upper-level fronts are often associated with the rapid transport of stratospheric air along tilted isentropes to the middle or lower troposphere, where this air leads to significantly enhanced ozone concentrations. These plumes of originally stratospheric air can only occasionally be observed at the surface because (i) stable boundary layers prevent an efficient vertical transport down to the surface, and (ii) even if boundary layer turbulence were strong enough to enable this transport, the originally stratospheric air mass can be diluted by mixing, such that only a weak stratospheric signal can be recorded at the surface. Most documented examples of stratospheric air reaching the surface occurred in mountainous regions. This study investigates two such events, using a passive stratospheric air mass tracer in a mesoscale model to explore the processes that enable the transport down to the surface. The events occurred in early May 2006 in the Rocky Mountains and in mid-June 2006 on the Tibetan Plateau. In both cases, a tropopause fold associated with an upperlevel front enabled stratospheric air to enter the troposphere. In our model simulation of the North American case, the strong frontal zone reaches down to 700 hPa and leads to a fairly direct vertical transport of the stratospheric tracer along the tilted isentropes to the surface. In the Tibetan Plateau case, however, no near-surface front exists and a reservoir of high stratospheric tracer concentrations initially forms at 300-400 hPa, without further isentropic descent. However, entrainment at the top of the very deep boundary layer (reaching to 300 hPa over the Tibetan Plateau) and turbulence within the boundary layer allows for downward transport of stratospheric air to the surface. Despite the strongly differing dynamical processes, stratospheric tracer concentrations at the surface reach peak values of 10%-20% of the imposed stratospheric value in both cases, corroborating the potential of deep stratosphere-to-troposphere transport events to significantly influence surface ozone concentrations in these regions. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468245200001 |
WOS关键词 | LAGRANGIAN-BASED ANALYSIS ; TROPOSPHERE EXCHANGE ; OZONE CONCENTRATIONS ; BOUNDARY-LAYER ; EXTRATROPICAL CYCLONES ; GLOBAL CLIMATOLOGY ; TROPOPAUSE FOLDS ; INTRUSIONS ; MODEL ; IMPACT |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/183303 |
专题 | 地球科学 |
作者单位 | 1.Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, Zurich, Switzerland; 2.Free Univ Berlin, Inst Meteorol, Berlin, Germany |
推荐引用方式 GB/T 7714 | Skerlak, Bojan,Pfahl, Stephan,Sprenger, Michael,et al. A numerical process study on the rapid transport of stratospheric air down to the surface over western North America and the Tibetan Plateau[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(9):6535-6549. |
APA | Skerlak, Bojan,Pfahl, Stephan,Sprenger, Michael,&Wernli, Heini.(2019).A numerical process study on the rapid transport of stratospheric air down to the surface over western North America and the Tibetan Plateau.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(9),6535-6549. |
MLA | Skerlak, Bojan,et al."A numerical process study on the rapid transport of stratospheric air down to the surface over western North America and the Tibetan Plateau".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.9(2019):6535-6549. |
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