Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0352.1 |
The Role of Cold Pools in Tropical Oceanic Convective Systems | |
Grant, Leah D.1; Lane, Todd P.2,3; van den Heever, Susan C.1 | |
2018-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:8页码:2615-2634 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Australia |
英文摘要 | The processes governing organized tropical convective systems are not completely understood despite their important influences on the tropical atmosphere and global circulation. In particular, cold pools are known to influence the structure and maintenance of midlatitude systems via Rotunno-Klemp-Weisman (RKW) theory, but cold pools may interact differently with tropical convection because of differences in cold pool strength and environmental shear. In this study, the role of cold pools in organized oceanic tropical convective systems is investigated, including their influence on system intensity, mesoscale structure, and propagation. To accomplish this goal, high-resolution idealized simulations are performed for two different systems that are embedded within a weakly sheared cloud population approaching radiative-convective equilibrium. The cold pools are altered by changing evaporation rates below cloud base in a series of sensitivity tests. The simulations demonstrate surprising findings: when cold pools are weakened, the convective systems become more intense. However, their propagation speeds and mesoscale structure are largely unaffected by the cold pool changes. Passive tracers introduced into the cold pools indicate that the convection intensifies when cold pools are weakened because cold pool air is entrained into updrafts, thereby reducing updraft intensity via the cold pools' initial negative buoyancy. Gravity waves, rather than cold pools, appear to be the important modulators of system propagation and mesoscale structure. These results reconfirm that RKW theory does not fully explain the behavior of tropical oceanic convective systems, even those that otherwise appear consistent with RKW thinking. |
英文关键词 | Tropics Gravity waves Mesoscale systems Cold pools Convective-scale processes Cloud resolving models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439291300001 |
WOS关键词 | LIVED SQUALL LINES ; GENERATED GRAVITY-WAVES ; DEEP MOIST CONVECTION ; TOGA COARE ; PART I ; PRECIPITATION FEATURES ; NUMERICAL EXPERIMENTS ; VERTICAL VELOCITY ; MESOSCALE SYSTEMS ; SELF-AGGREGATION |
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/29729 |
专题 | 地球科学 |
作者单位 | 1.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA; 2.Univ Melbourne, Sch Earth Sci, Melbourne, Vic, Australia; 3.Univ Melbourne, Australian Res Council, Ctr Excellence Climate Extremes, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Grant, Leah D.,Lane, Todd P.,van den Heever, Susan C.. The Role of Cold Pools in Tropical Oceanic Convective Systems[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(8):2615-2634. |
APA | Grant, Leah D.,Lane, Todd P.,&van den Heever, Susan C..(2018).The Role of Cold Pools in Tropical Oceanic Convective Systems.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(8),2615-2634. |
MLA | Grant, Leah D.,et al."The Role of Cold Pools in Tropical Oceanic Convective Systems".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.8(2018):2615-2634. |
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