Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0183.1 |
Mesoscale Circulations and Organized Convection in African Easterly Waves | |
Tomassini, Lorenzo | |
2018-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:12页码:4357-4381 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Global convection-permitting model simulations and remote sensing observations are used to investigate the interaction between organized convection, both moist and dry, and the atmospheric circulation in the case of an African easterly wave (AEW). The wave disturbance is associated with a quadrupole structure of divergence, with two convergence centers slightly ahead of the trough. Moisture transport from southeast of the trough to the area in front and lower midtropospheric moisture convergence precondition and organize convection. The main inflow into the squall-line cluster is from behind. The moisture-abundant inflow collides at the low level with monsoon air with high moist static energy and establishes a frontal line of updrafts at the leading edge of the propagating mesoscale convective system. A mantle of moisture surrounds the convective core. A potential vorticity budget analysis reveals that convective latent heating is driving the evolution of the wave but not in a quasi-steady way. The wave propagation includes a succession of convective bursts and subsequent dynamic adjustment processes. Dry convection associated with the Saharan air layer (SAL) and SAL intrusions into the wave trough together with vorticity advection can play a role in intensifying AEWs dynamically as they move from the West African coast across the Atlantic Ocean. Our analysis demonstrates that the synoptic-scale wave and convection are interlinked through mesoscale circulations on a continuum of scales. This implies that the relation between organized convection and the atmospheric circulation is intrinsically dynamic, which poses a particular challenge to subgrid convection parameterizations in numerical models. |
英文关键词 | Convection Dry intrusions Waves atmospheric Diabatic heating Mesoscale systems |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000452134500002 |
WOS关键词 | SAHARAN AIR LAYER ; POTENTIAL VORTICITY ; SQUALL-LINE ; TROPICAL ATMOSPHERE ; DEEP CONVECTION ; PRECIPITATION ; MODEL ; TRANSPORT ; DYNAMICS ; DISTURBANCES |
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/29694 |
专题 | 地球科学 |
作者单位 | Met Off, Exeter, Devon, England |
推荐引用方式 GB/T 7714 | Tomassini, Lorenzo. Mesoscale Circulations and Organized Convection in African Easterly Waves[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(12):4357-4381. |
APA | Tomassini, Lorenzo.(2018).Mesoscale Circulations and Organized Convection in African Easterly Waves.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(12),4357-4381. |
MLA | Tomassini, Lorenzo."Mesoscale Circulations and Organized Convection in African Easterly Waves".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.12(2018):4357-4381. |
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