Arid
DOI10.1175/JCLI-D-14-00230.1
Detection and Analysis of an Amplified Warming of the Sahara Desert
Cook, Kerry H.; Vizy, Edward K.
通讯作者Cook, Kerry H.
来源期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2015
卷号28期号:16页码:6560-6580
英文摘要

Evaluation of three reanalyses (ERA-Interim, NCEP-2, and MERRA) and two observational datasets [CRU and Global Historical Climatology Network (GHCN)] for 1979-2012 demonstrates that the surface temperature of the Sahara Desert has increased at a rate that is 2-4 times greater than that of the tropical-mean temperature over the 34-yr time period. While the response to enhanced greenhouse gas forcing over most of the globe involves the full depth of the atmosphere, with increases in longwave back radiation increasing latent heat fluxes, the dryness of the Sahara surface precludes this response. Changes in the surface heat balance over the Sahara during the analysis period are primarily in the upward and downward longwave fluxes. As a result, the warming is concentrated near the surface, and a desert amplification of the warming occurs. The desert amplification is analogous to the polar amplification of the global warming signal, which is concentrated at the surface, in part, because of the vertical stability of the Arctic atmosphere. Accompanying the amplified surface warming of the Sahara is a strengthening of both the summertime heat low and the African easterly jet and a weakening of the wintertime anticyclone and the low-level Harmattan winds. Potential implications of the desert amplification include decreases in mineral dust aerosols globally, decreases in wintertime cold air surge activity, and increases in Sahel rainfall.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000359655200017
WOS关键词ERA-INTERIM ; CLIMATE MODELS ; ENERGY BUDGET ; GLOBAL ENERGY ; WATER-VAPOR ; HEAT LOW ; OCEAN ; REANALYSIS ; ATMOSPHERE ; SURFACE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188487
作者单位Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA
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Cook, Kerry H.,Vizy, Edward K.. Detection and Analysis of an Amplified Warming of the Sahara Desert[J],2015,28(16):6560-6580.
APA Cook, Kerry H.,&Vizy, Edward K..(2015).Detection and Analysis of an Amplified Warming of the Sahara Desert.JOURNAL OF CLIMATE,28(16),6560-6580.
MLA Cook, Kerry H.,et al."Detection and Analysis of an Amplified Warming of the Sahara Desert".JOURNAL OF CLIMATE 28.16(2015):6560-6580.
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