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DOI | 10.1002/2017JD027033 |
Environments of Long-Lived Mesoscale Convective Systems Over the Central United States in Convection Permitting Climate Simulations | |
Yang, Qing1; Houze, Robert A.1,2; Leung, L. Ruby1; Feng, Zhe1 | |
2017-12-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:24 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Continental-scale convection-permitting simulations of the warm seasons of 2011 and 2012 using the Weather Research and Forecasting model reproduce realistic structure and frequency distribution of lifetime and event mean precipitation of mesoscale convective systems (MCSs) over the central United States. Analysis is performed to determine the environmental conditions conducive to generating long-lived MCSs. The simulations show that MCSs systematically form over the central Great Plains ahead of a trough in the westerlies in combination with an enhanced low-level moist jet from the Gulf of Mexico. These environmental properties at the time of storm initiation are most prominent for the MCSs that persist for the longest times. MCSs reaching lifetimes of 9h or more occur closer to the approaching trough than shorter-lived MCSs. These long-lived MCSs exhibit the strongest feedback to the environment through diabatic heating in the trailing regions of the MCSs. The feedback strengthens the synoptic-scale trough associated with the MCS by producing an anomaly circulation characterized by a divergent perturbation at high levels over the MCS and a midlevel cyclonic circulation perturbation near the trough line in association with the trailing portion of the MCS. The quasi-balanced mesoscale vortex may help to maintain the MCS over a long period of time by feeding dry, cool air into the environment at the rear of the MCS region that enhances evaporative cooling and helps maintain the MCS. |
英文关键词 | mesoscale convective systems large-scale environment long-lived MCS convection permitting modeling MCS-circulation interactions central United States |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419950200027 |
WOS关键词 | TROPICAL SQUALL-LINE ; WARM-SEASON PRECIPITATION ; RAPID UPDATE CYCLE ; CLOUD CLUSTERS ; WEATHER SYSTEMS ; WEST-AFRICA ; CORE VORTEX ; LIFE-CYCLE ; EVOLUTION ; DYNAMICS |
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/33548 |
专题 | 气候变化 |
作者单位 | 1.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA; 2.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Yang, Qing,Houze, Robert A.,Leung, L. Ruby,et al. Environments of Long-Lived Mesoscale Convective Systems Over the Central United States in Convection Permitting Climate Simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(24). |
APA | Yang, Qing,Houze, Robert A.,Leung, L. Ruby,&Feng, Zhe.(2017).Environments of Long-Lived Mesoscale Convective Systems Over the Central United States in Convection Permitting Climate Simulations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(24). |
MLA | Yang, Qing,et al."Environments of Long-Lived Mesoscale Convective Systems Over the Central United States in Convection Permitting Climate Simulations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.24(2017). |
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