Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-16-0785.1 |
A Moist Static Energy Budget-Based Analysis of the Sahel Rainfall Response to Uniform Oceanic Warming | |
Hill, Spencer A.1,4,5; Ming, Yi2; Held, Isaac M.2; Zhao, Ming2,3 | |
2017-08-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:15 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Climate models generate a wide range of precipitation responses to global warming in the African Sahel, but all that use the NOAA Geophysical Fluid Dynamics Laboratory AM2.1 model as their atmospheric component dry the region sharply. This study compares the Sahel's wet season response to uniform 2-K SST warming in AM2.1 using either its default convective parameterization, relaxed Arakawa-Schubert (RAS), or an alternate, the University of Washington(UW) parameterization, using the moist static energy (MSE) budget to diagnose the relevant mechanisms. UW generates a drier, cooler control Sahel climate than does RAS and a modest rainfall increase with SST warming rather than a sharp decrease. Horizontal advection of dry, low-MSE air from the Sahara Desert-a leading-order term in the control MSE budget with either parameterization-is enhanced with oceanic warming, driven by enhanced meridional MSE andmoisture gradients spanning the Sahel. With RAS, this occurs throughout the free troposphere and is balanced by anomalous MSE import through anomalous subsidence, which must be especially large in the midtroposphere where the moist static stability is small. With UW, the strengthening of the meridional MSE gradient is mostly confined to the lower troposphere, due in part to comparatively shallow prevailing convection. This necessitates less subsidence, enabling convective and total precipitation to increase with UW, although both large-scale precipitation and precipitation minus evaporation decrease. This broad set of hydrological and energetic responses persists in simulations with SSTs varied over a wide range. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405470400003 |
WOS关键词 | WEST-AFRICAN MONSOON ; PART I ; GENERAL-CIRCULATION ; SURFACE-TEMPERATURE ; CLIMATE SENSITIVITY ; CUMULUS CONVECTION ; SCALE CONVECTION ; ARAKAWA-SCHUBERT ; DYNAMICS ; SIMULATIONS |
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/20970 |
专题 | 气候变化 |
作者单位 | 1.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08544 USA; 2.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA; 3.Univ Corp Atmospher Res, Boulder, CO USA; 4.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA; 5.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Hill, Spencer A.,Ming, Yi,Held, Isaac M.,et al. A Moist Static Energy Budget-Based Analysis of the Sahel Rainfall Response to Uniform Oceanic Warming[J]. JOURNAL OF CLIMATE,2017,30(15). |
APA | Hill, Spencer A.,Ming, Yi,Held, Isaac M.,&Zhao, Ming.(2017).A Moist Static Energy Budget-Based Analysis of the Sahel Rainfall Response to Uniform Oceanic Warming.JOURNAL OF CLIMATE,30(15). |
MLA | Hill, Spencer A.,et al."A Moist Static Energy Budget-Based Analysis of the Sahel Rainfall Response to Uniform Oceanic Warming".JOURNAL OF CLIMATE 30.15(2017). |
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