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DOI | 10.1175/JAS-D-18-0178.1 |
Northward Propagation, Initiation, and Termination of Boreal Summer Intraseasonal Oscillations in a Zonally Symmetric Model | |
Yang, Qiu1; Khouider, Boualem2; Majda, Andrew J.1,3,4; De La Chevrotiere, Michele5 | |
2019-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:2页码:639-668 |
文章类型 | Article |
语种 | 英语 |
国家 | U Arab Emirates; Canada; USA |
英文摘要 | A simple multilayer zonally symmetric model, using a multicloud convective parameterization and coupled to a dynamical bulk atmospheric boundary layer, is used here to simulate boreal summer intraseasonal oscillations (BSISO) in the summer monsoon trough and elucidate the underlying main physical mechanisms responsible for their initiation, propagation, and termination. Northward-moving precipitating events initiated near the equator propagate northward at roughly 1 degrees day(-1) and terminate near 20 degrees N. Unlike earlier findings, the northward propagation of precipitation anomalies in this model is due to the propagation of positive moisture anomalies in the northward direction, resulting from an asymmetry in the meridional velocity induced by the beta effect. From a moisture-budget perspective, advection constitutes a biased intrusion of dry air into the convection center, forcing new convection events to form north of the wave disturbance, while moisture convergence supplies the precipitation sink. The BSISO events are initiated near the equator when the competing effects between first-baroclinic divergence and second-baroclinic convergence, induced by the descending branch of the Hadley cell and in situ congestus heating, respectively, become favorable to convective intensification. The termination often near 20 degrees N and halfway stalling of these precipitating events occur when the asymmetry in the first-baroclinic meridional winds weakens and when the negative moisture gradient to the north of the convection center becomes too strong as the anomaly exits the imposed warm pool domain. |
英文关键词 | Atmospheric circulation Convective-scale processes Dynamics Hadley circulation Madden-Julian oscillation Planetary waves |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000459067400002 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; CLIMATE FORECAST SYSTEM ; BOUNDARY-LAYER DYNAMICS ; AIR-SEA INTERACTION ; PART I ; CONVECTION ; WAVES ; VARIABILITY ; CIRCULATION ; WEATHER |
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/29302 |
专题 | 地球科学 |
作者单位 | 1.New York Univ Abu Dhabi, Ctr Prototype Climate Modeling, Abu Dhabi, U Arab Emirates; 2.Univ Victoria, Dept Math & Stat, Victoria, BC, Canada; 3.NYU, Courant Inst Math Sci, Dept Math, New York, NY USA; 4.NYU, Courant Inst Math Sci, Ctr Atmosphere Ocean Sci, New York, NY USA; 5.Environm & Climate Change Canada, Meteorol Res Div, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Yang, Qiu,Khouider, Boualem,Majda, Andrew J.,et al. Northward Propagation, Initiation, and Termination of Boreal Summer Intraseasonal Oscillations in a Zonally Symmetric Model[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(2):639-668. |
APA | Yang, Qiu,Khouider, Boualem,Majda, Andrew J.,&De La Chevrotiere, Michele.(2019).Northward Propagation, Initiation, and Termination of Boreal Summer Intraseasonal Oscillations in a Zonally Symmetric Model.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(2),639-668. |
MLA | Yang, Qiu,et al."Northward Propagation, Initiation, and Termination of Boreal Summer Intraseasonal Oscillations in a Zonally Symmetric Model".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.2(2019):639-668. |
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