Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0049.1 |
Upscale Impact of Mesoscale Disturbances of Tropical Convection on 2-Day Waves | |
Yang, Qiu1; Majda, Andrew J.1,2,3 | |
2019 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:1页码:171-194 |
文章类型 | Article |
语种 | 英语 |
国家 | U Arab Emirates; USA |
英文摘要 | Westward-propagating 2-day waves with embedded mesoscale disturbances contribute a large portion of synoptic variability of tropical convection over the western Pacific. It is of crucial importance to assess the upscale impact on 2-day waves of these mesoscale disturbances that propagate at various tilt angles. Also, it will be informative to consider the upscale impact on both symmetric and asymmetric 2-day waves in terms of convection, morphology of circulation, and tropical cyclogenesis. A simple multiscale asymptotic model is used to simulate the two-scale structure of 2-day waves. The synoptic-scale circulation response is driven by westward-propagating mean heating and eddy transfer of momentum and temperature. The latter is interpreted as the upscale impact of mesoscale fluctuations. The upscale impact of mesoscale disturbances that propagate at a tilt angle between 315 degrees and 45 degrees induces low-level negative potential temperature anomalies and westerly inflow. Shallow congestus convection triggered in a moist environment at the leading edge of the 2-day waves supports the westward propagation. For asymmetric 2-day waves in the Northern Hemisphere, the upscale impact of mesoscale disturbances propagating at a tilt angle between 315 degrees and 0 degrees induces lower-tropospheric cyclonic flows and negative pressure perturbation. This provides a new mechanism to precondition tropical cyclogenesis. A comparison of the upscale impact on symmetric westward-propagating 2-day waves and eastward-propagating convectively coupled Kelvin waves shows that their tilt angle ranges with favorable conditions for convection and enhanced inflow are simply opposite. |
英文关键词 | Convection Gravity waves Mesoscale systems Synoptic-scale processes Tropical cyclones Tropical variability |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454684900001 |
WOS关键词 | COUPLED EQUATORIAL WAVES ; INTERTROPICAL CONVERGENCE ZONE ; GENERALIZED ELIASSEN-PALM ; SCALE CLOUD DISTURBANCES ; TOGA COARE IOP ; PART I ; MULTISCALE MODEL ; STEADY CONVECTION ; INTRASEASONAL IMPACT ; PLANETARY-WAVES |
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/29778 |
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.NYU, Courant Inst Math Sci, Dept Math, New York, NY USA; 3.NYU, Courant Inst Math Sci, Ctr Atmosphere Ocean Sci, New York, NY USA |
推荐引用方式 GB/T 7714 | Yang, Qiu,Majda, Andrew J.. Upscale Impact of Mesoscale Disturbances of Tropical Convection on 2-Day Waves[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(1):171-194. |
APA | Yang, Qiu,&Majda, Andrew J..(2019).Upscale Impact of Mesoscale Disturbances of Tropical Convection on 2-Day Waves.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(1),171-194. |
MLA | Yang, Qiu,et al."Upscale Impact of Mesoscale Disturbances of Tropical Convection on 2-Day Waves".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.1(2019):171-194. |
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