Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0154.1 |
Three-Dimensional Structure of Mass-Weighted Isentropic Time-Mean Meridional Circulations | |
Kanno, Yuki; Iwasaki, Toshiki | |
2018-06-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:6页码:2029-2047 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The present study develops a diagnostic framework for investigating the three-dimensional (3D) structure of mass-weighted isentropic time-mean (T-MIM) meridional circulations and conducts a preliminary analysis of the winter hemispheres. The T-MIM meridional velocity can unfold, in the zonal direction, time-averaged two-dimensional (2D) mass-weighted isentropic zonal means. Furthermore, the T-MIM velocity can be decomposed into the unweighted isentropic time-mean (uTM) velocity and the temporal eddy-correlated transport velocity, the so-called bolus velocity. The bolus velocity greatly contributes to the 2D extratropical direct circulation in the troposphere and to the Brewer-Dobson circulation in the stratosphere. The 3D bolus velocity seems to reflect the geographical distributions of baroclinic instability wave activity. In the boreal winter, both low-level equatorward flows and upper-level poleward flows are located around the North Pacific and North Atlantic storm tracks. In the austral winter, low-level equatorward flows extend zonally across the midlatitudes. In the subtropics, the 3D bolus velocity is found to be significant in the upper branch of the Hadley circulation. A zonal momentum equation is formulated to examine the 3D momentum balance of the meridional circulation in the T-MIM framework. In the extratropics, the uTM and bolus meridional velocities are in geostrophic balance with the stationary and transient components of the 3D Eliassen-Palm (EP) flux divergence, respectively. The pressure gradient force of transient baroclinic instability waves balances with the low-level equatorward flows of the bolus velocity in the storm tracks. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434942300015 |
WOS关键词 | ELIASSEN-PALM FLUX ; NORTHERN HEMISPHERIC WINTER ; HYBRID VERTICAL COORDINATE ; BREWER-DOBSON CIRCULATION ; ANTARCTIC POLAR VORTEX ; WAVE ACTIVITY FLUX ; FLOW INTERACTIONS ; FORMULATION ; TRANSPORT ; OZONE |
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/29764 |
专题 | 地球科学 |
作者单位 | Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Miyagi, Japan |
推荐引用方式 GB/T 7714 | Kanno, Yuki,Iwasaki, Toshiki. Three-Dimensional Structure of Mass-Weighted Isentropic Time-Mean Meridional Circulations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(6):2029-2047. |
APA | Kanno, Yuki,&Iwasaki, Toshiki.(2018).Three-Dimensional Structure of Mass-Weighted Isentropic Time-Mean Meridional Circulations.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(6),2029-2047. |
MLA | Kanno, Yuki,et al."Three-Dimensional Structure of Mass-Weighted Isentropic Time-Mean Meridional Circulations".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.6(2018):2029-2047. |
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