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Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation | |
Yang, Da1,2,3 | |
2018-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:2页码:469-478 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Organized rainstorms and their associated overturning circulations can self-emerge over an ocean surface with uniform temperature in cloud-resolving simulations. This phenomenon is referred to as convective self-aggregation. Convective self-aggregation is argued to be an important building block for tropical weather systems and may help regulate tropical atmospheric humidity and thereby tropical climate stability. Here the author presents a boundary layer theory for the horizontal scale lambda of 2D (x, z) convective self-aggregation by considering both the momentum and energy constraints for steady circulations. This theory suggests that lambda scales with the product of the boundary layer height h and the square root of the amplitude of density variation between aggregated moist and dry regions in the boundary layer, and that this density variation mainly arises from the moisture variation due to the virtual effect of water vapor. This theory predicts the following: 1) the order of magnitude of lambda is similar to 2000 km, 2) the aspect ratio of the boundary layer lambda/h increases with surface warming, and 3) lambda decreases when the virtual effect of water vapor is disabled. These predictions are confirmed using a suite of cloud-resolving simulations spanning a wide range of climates. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425753300005 |
WOS关键词 | EQUILIBRIUM SIMULATIONS ; HYDROLOGICAL CYCLE ; MODEL ; CLIMATE ; SENSITIVITY ; FORMULATION ; ATMOSPHERE ; TROPICS |
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/29544 |
专题 | 地球科学 |
作者单位 | 1.Univ Calif Davis, Davis, CA 95616 USA; 2.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA; 3.Univ Calif Berkeley, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Yang, Da. Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(2):469-478. |
APA | Yang, Da.(2018).Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(2),469-478. |
MLA | Yang, Da."Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.2(2018):469-478. |
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