Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0021.1 |
ITCZ Breakdown and Its Upscale Impact on the Planetary-Scale Circulation over the Eastern Pacific | |
Yang, Qiu1,2,3; Majda, Andrew J.1,2,3; Khouider, Boualem4 | |
2017-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; U Arab Emirates; Canada |
英文摘要 | The eastern Pacific (EP) intertropical convergence zone (ITCZ) is sometimes observed to break down into several vortices on the synoptic time scale. It is still a challenge for present-day numerical models to simulate the ITCZ breakdown in the baroclinic modes. Also, the upscale impact of the associated mesoscale fluctuations on the planetary-scale circulation is not well understood. Here, a simplified multiscale model for the modulation of the ITCZ is used to study these issues. A prescribed two-scale heating drives the planetary-scale circulation through both planetary-scale mean heating and eddy flux divergence of zonal momentum, where the latter represents the upscale impact of mesoscale disturbances. In an idealized scenario where the heating only varies on the mesoscale, key features of the ITCZ breakdown in the baroclinic modes are captured. The eddy flux divergence of zonal momentum is characterized by midlevel (low level) eastward (westward) momentum forcing at subtropical latitudes of the Northern Hemisphere and opposite-signed midlevel momentum forcing at low latitudes. Such upscale impact of mesoscale fluctuations tends to accelerate (decelerate) planetary-scale zonal jets in the middle (lower) troposphere. Compared with deep heating, shallow heating induces stronger vorticity anomalies on the mesoscale and more significant eddy flux divergence of zonal momentum and acceleration-deceleration effects on the planetary-scale mean flow. In a more realistic scenario where the heating also varies on the planetary scale, the most significant zonal velocity anomalies are confined in the diabatic heating region. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418533900009 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; INTERTROPICAL CONVERGENCE ZONE ; CONVECTIVE MOMENTUM TRANSPORT ; SHALLOW MERIDIONAL CIRCULATION ; ORGANIZED TROPICAL CONVECTION ; ATMOSPHERIC ENERGY TRANSPORTS ; MULTISCALE MODEL ; CUMULUS CONVECTION ; INTRASEASONAL IMPACT ; HADLEY CIRCULATION |
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/29326 |
专题 | 地球科学 |
作者单位 | 1.NYU, Courant Inst Math Sci, Dept Math, New York, NY 10003 USA; 2.NYU, Courant Inst Math Sci, Ctr Atmosphere Ocean Sci, New York, NY 10003 USA; 3.New York Univ Abu Dhabi, Ctr Prototype Climate Modeling, Abu Dhabi, U Arab Emirates; 4.Univ Victoria, Dept Math & Stat, Victoria, BC, Canada |
推荐引用方式 GB/T 7714 | Yang, Qiu,Majda, Andrew J.,Khouider, Boualem. ITCZ Breakdown and Its Upscale Impact on the Planetary-Scale Circulation over the Eastern Pacific[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(12). |
APA | Yang, Qiu,Majda, Andrew J.,&Khouider, Boualem.(2017).ITCZ Breakdown and Its Upscale Impact on the Planetary-Scale Circulation over the Eastern Pacific.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(12). |
MLA | Yang, Qiu,et al."ITCZ Breakdown and Its Upscale Impact on the Planetary-Scale Circulation over the Eastern Pacific".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.12(2017). |
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