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DOI | 10.1175/JAS-D-17-0030.1 |
A Conceptual Model of a Shallow Circulation Induced by Prescribed Low-Level Radiative Cooling | |
Naumann, Ann Kristin; Stevens, Bjorn; Hohenegger, Cathy; Mellado, Juan Pedro | |
2017-10-01 | |
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:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | A conceptual bulk model for a dry, convective boundary layer with prescribed horizontally homogeneous and heterogeneous low-level radiative cooling rates is developed. For horizontally homogeneous radiative cooling, the response of the system to varying its prescribed parameters is explored and formulated in terms of nondimensional parameters. Large-eddy simulations with prescribed radiative cooling rates match the results of the bulk model well. It is found that, depending on the strength of the surface coupling, the height of the boundary layer (BL) either increases or decreases in response to increasing radiative BL cooling. Another property of the system is that, for increasing surface temperature, the BL temperature decreases if the prescribed radiative BL cooling rates are strong. This counterintuitive behavior is caused by the formulation of the entrainment rate at the inversion. Heterogeneous radiative BL cooling is found to cause a circulation induced by pressure deviations between the area of weak radiative BL cooling and the area of strong radiative BL cooling. Including the feedback of the induced circulation on the BL in a two-column model leads to a modified equilibrium state, in which a weakened horizontal BL flow of about 1ms 21 is maintained for differences in radiative BL cooling rates larger than 1Kday 21. Such a circulation strength is comparable to a shallow circulation caused by surface temperature differences of a few kelvins. Spatial differences in radiative BL cooling should therefore be considered as a first-order effect for the formation of shallow circulations. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411637700001 |
WOS关键词 | NONPRECIPITATING CUMULUS CONVECTION ; INTERTROPICAL CONVERGENCE ZONES ; LARGE-SCALE CIRCULATIONS ; BOUNDARY-LAYER ; SELF-AGGREGATION ; EQUILIBRIUM SIMULATIONS ; DYNAMICS ; ENTRAINMENT ; INSTABILITY ; MECHANISMS |
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/29547 |
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 | Naumann, Ann Kristin,Stevens, Bjorn,Hohenegger, Cathy,et al. A Conceptual Model of a Shallow Circulation Induced by Prescribed Low-Level Radiative Cooling[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(10). |
APA | Naumann, Ann Kristin,Stevens, Bjorn,Hohenegger, Cathy,&Mellado, Juan Pedro.(2017).A Conceptual Model of a Shallow Circulation Induced by Prescribed Low-Level Radiative Cooling.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(10). |
MLA | Naumann, Ann Kristin,et al."A Conceptual Model of a Shallow Circulation Induced by Prescribed Low-Level Radiative Cooling".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.10(2017). |
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