Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD030087 |
The Characteristics of Tropical and Midlatitude Mesoscale Convective Systems as Revealed by Radar Wind Profilers | |
Wang, Die1; Giangrande, Scott E.1; Schiro, Kathleen A.2; Jensen, Michael P.1; Houze, Robert A., Jr.3,4 | |
2019-04-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:8页码:4601-4619 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study contrasts characteristics of mature squall-line mesoscale convective systems (MCSs) observed by extended ground-based radar wind profiler (RWP) deployments from the U.S. Department of Energy Atmospheric Radiation Measurement program. This analysis compares the dynamical structure, precipitation, and cold pool properties associated with MCS events over RWP sites in Oklahoma, USA, (midlatitude) to those observed during a 2-year RWP deployment to Manaus, Brazil, during GoAmazon2014/5 campaign (tropical). The MCSs indicate similar convective line rainfall rates and total rainfall accumulations. However, midlatitude events suggest a larger fractional stratiform contribution to total precipitation. For both regions, convective line cold pools are associated with sharp decreases (approximately 10 K) in the surface equivalent potential temperature (theta(e)) near the time of line passage. Surface theta(e) properties for both regions suggest a modest relationship between rainfall rate and the probability of observing measurable surface rainfall. The probability of observing convective updrafts in both tropical and midlatitude MCS events is found to be similar as a function of low-level radar reflectivity. However, midlatitude MCSs are associated with more intense convective updrafts, with upward air motions (mean, maximum) peaking at higher altitude. The most pronounced contrast is the propensity for deeper and more intense downdrafts in midlatitude MCSs. An analysis based on observed downdraft properties is performed using simple mixing assumptions. For these events, the vertical gradient of theta(e) in the lower troposphere is relatively consistent between the Amazon and Oklahoma, suggesting similar mixing rates for downdrafts originating below 3 km (0.1 km(-1)). However, if downdrafts originate nearer to the level of minimum theta(e) at SGP, mixing may be occurring at rates comparable to 0.3 km(-1). |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000469071400020 |
WOS关键词 | INCLUDING MASS FLUXES ; SQUALL-LINE ; VERTICAL VELOCITY ; MICROPHYSICAL CHARACTERISTICS ; RAINFALL CHARACTERISTICS ; PERMITTING SIMULATIONS ; FLORIDA CUMULONIMBUS ; CLIMATE SENSITIVITY ; CLOUD MICROPHYSICS ; PART I |
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/182476 |
专题 | 气候变化 |
作者单位 | 1.Brookhaven Natl Lab, Environm & Climates Sci Dept, Upton, NY 11973 USA; 2.CALTECH, Jet Prop Lab, Pasadena, CA USA; 3.Pacific Northwest Natl Lab, Richland, WA 99352 USA; 4.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Wang, Die,Giangrande, Scott E.,Schiro, Kathleen A.,et al. The Characteristics of Tropical and Midlatitude Mesoscale Convective Systems as Revealed by Radar Wind Profilers[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(8):4601-4619. |
APA | Wang, Die,Giangrande, Scott E.,Schiro, Kathleen A.,Jensen, Michael P.,&Houze, Robert A., Jr..(2019).The Characteristics of Tropical and Midlatitude Mesoscale Convective Systems as Revealed by Radar Wind Profilers.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(8),4601-4619. |
MLA | Wang, Die,et al."The Characteristics of Tropical and Midlatitude Mesoscale Convective Systems as Revealed by Radar Wind Profilers".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.8(2019):4601-4619. |
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