Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0290.1 |
On the Dependence of Squall-Line Characteristics on Surface Conditions | |
Peters, Karsten; Hohenegger, Cathy | |
2017-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | The influence of surface conditions in the form of changing surface temperatures on fully developed mesoscale convective systems (MCSs) is investigated using a cloud-system-resolving setup of the Icosahedral Nonhydrostatic (ICON) model (1-km grid spacing). The simulated MCSs take the form of squall lines with trailing stratiform precipitation. After the squall lines have reached a quasi-steady state, secondary convection is triggered ahead of the squall line, resulting in an increase of squall-line propagation speed, also known as discrete propagation. The higher propagation speed is then maintained for the remainder of the simulations because secondary convection ahead of the squall line acts to reduce the environmental wind shear over the depth of the squall line's cold pool. The surface conditions have only a marginal effect on the squall lines themselves. This is so because the surface fluxes cannot significantly affect the cold pool, which is continuously replenished by midtropospheric air. The midtroposphere remains similar given the use of identical initial profiles. The only effect of the surface fluxes consists in an earlier acceleration of the squall line due to earlier initiation of secondary convection with higher surface temperature. Finally, a conceptual model to estimate the change in surface temperature needed to achieve a change in onset time of prefrontal secondary convection and the associated discrete propagation events given the environmental conditions is presented. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405556700006 |
WOS关键词 | MESOSCALE CONVECTIVE SYSTEM ; VERTICAL WIND SHEAR ; TOGA-COARE ; HORIZONTAL RESOLUTION ; SECONDARY INITIATION ; SOUTHERN BRITAIN ; MULTIPLE BANDS ; DIURNAL CYCLE ; MODEL ; PRECIPITATION |
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/29369 |
专题 | 地球科学 |
作者单位 | Max Planck Inst Meteorol, Hamburg, Germany |
推荐引用方式 GB/T 7714 | Peters, Karsten,Hohenegger, Cathy. On the Dependence of Squall-Line Characteristics on Surface Conditions[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(7). |
APA | Peters, Karsten,&Hohenegger, Cathy.(2017).On the Dependence of Squall-Line Characteristics on Surface Conditions.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(7). |
MLA | Peters, Karsten,et al."On the Dependence of Squall-Line Characteristics on Surface Conditions".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.7(2017). |
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