Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0303.1 |
Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean | |
Rydbeck, Adam V.1; Jensen, Tommy G.1; Igel, Matthew R.2 | |
2019-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:7页码:2023-2042 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The atmospheric response to sea surface temperature (SST) variations forced by oceanic downwelling equatorial Rossby waves is investigated using an idealized convection-resolving model. Downwelling equatorial Rossby waves sharpen SST gradients in the western Indian Ocean. Changes in SST cause the atmosphere to hydrostatically adjust, subsequently modulating the low-level wind field. In an idealized cloud model, surface wind speeds, surface moisture fluxes, and low-level precipitable water maximize near regions of strongest SST gradients, not necessarily in regions of warmest SST. Simulations utilizing the steepened SST gradient representative of periods with oceanic downwelling equatorial Rossby waves show enhanced patterns of surface convergence and precipitation that are linked to a strengthened zonally overturning circulation. During these conditions, convection is highly organized, clustering near the maximum SST gradient and ascending branch of the SST-induced overturning circulation. When the SST gradient is reduced, as occurs during periods of weak or absent oceanic equatorial Rossby waves, convection is much less organized and total rainfall is decreased. This demonstrates the previously observed upscale organization of convection and rainfall associated with oceanic downwelling equatorial Rossby waves in the western Indian Ocean. These results suggest that the enhancement of surface fluxes that results from a steepening of the SST gradient is the leading mechanism by which oceanic equatorial Rossby waves prime the atmospheric boundary layer for rapid convective development. |
英文关键词 | Atmosphere Indian Ocean Convection Convergence divergence Air-sea interaction Nonhydrostatic models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000472925100002 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; MJO INITIATION ; LIFE-CYCLE ; CLOUD ; MECHANISM ; RAINFALL ; FEEDBACK ; MICROPHYSICS ; CONVERGENCE ; VARIABILITY |
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/184742 |
专题 | 地球科学 |
作者单位 | 1.US Naval Res Lab, Stennis Space Ctr, MS 39529 USA; 2.Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA |
推荐引用方式 GB/T 7714 | Rydbeck, Adam V.,Jensen, Tommy G.,Igel, Matthew R.. Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(7):2023-2042. |
APA | Rydbeck, Adam V.,Jensen, Tommy G.,&Igel, Matthew R..(2019).Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(7),2023-2042. |
MLA | Rydbeck, Adam V.,et al."Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.7(2019):2023-2042. |
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