Arid
DOI10.1002/2013JD020046
Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index
Colarco, Peter R.1; Nowottnick, Edward P.1,2; Randles, Cynthia A.1,3; Yi, Bingqi4; Yang, Ping4; Kim, Kyu-Myong1,3,5; Smith, Jamison A.6; Bardeen, Charles G.7
通讯作者Colarco, Peter R.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2014
卷号119期号:2页码:753-786
英文摘要

The radiative effects of Saharan dust aerosols are investigated in the NASA GEOS-5 atmospheric general circulation model. A sectional aerosol microphysics model (CARMA) is run online in GEOS-5. CARMA treats the dust aerosol lifecycle, and its tracers are radiatively coupled to GEOS-5. A series of AMIP-style simulations are performed, in which input dust optical properties (particle shape and refractive index) are varied. Simulated dust distributions for summertime Saharan dust compare well to observations, with best results found when the most absorbing dust optical properties are assumed. Dust absorption leads to a strengthening of the summertime Hadley cell circulation, increased dust lofting to higher altitudes, and a strengthening of the African easterly jet, resulting in increased dust atmospheric lifetime and farther northward and westward transport. We find a positive feedback of dust radiative forcing on emissions, in contrast with previous studies, which we attribute to our having a relatively strong longwave forcing caused by our simulating larger effective particle sizes. This longwave forcing reduces the magnitude of midday net surface cooling relative to other studies, and leads to a nighttime warming that results in higher nighttime wind speeds and dust emissions. The radiative effects of dust particle shape have only minor impact on transport and emissions, with small (similar to 5%) impact on top of atmosphere shortwave forcing, in line with previous studies, but relatively more pronounced effects on shortwave atmospheric heating and surface forcing (similar to 20% increase in atmospheric forcing for spheroids). Shape effects on longwave heating terms are of order similar to 10%.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000338338100011
WOS关键词GENERAL-CIRCULATION MODEL ; SAHARAN AIR LAYER ; SEA-SALT AEROSOL ; MINERAL DUST ; OPTICAL-PROPERTIES ; SIZE DISTRIBUTION ; NORTH-ATLANTIC ; DESERT DUST ; LIGHT-SCATTERING ; BOUNDARY-LAYER
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/2XILL650/183334
作者单位1.NASA GSFC, Atmospher Chem & Dynam Lab, Greenbelt, MD 20771 USA;
2.NASA GSFC, NASA Postdoctoral Program, Greenbelt, MD USA;
3.GESTAR Morgan State Univ NASA GSFC, Greenbelt, MD USA;
4.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX USA;
5.NASA GSFC, Climate & Radiat Lab, Greenbelt, MD USA;
6.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA;
7.Natl Ctr Atmospher Res, Boulder, CO 80307 USA
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Colarco, Peter R.,Nowottnick, Edward P.,Randles, Cynthia A.,et al. Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index[J],2014,119(2):753-786.
APA Colarco, Peter R..,Nowottnick, Edward P..,Randles, Cynthia A..,Yi, Bingqi.,Yang, Ping.,...&Bardeen, Charles G..(2014).Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,119(2),753-786.
MLA Colarco, Peter R.,et al."Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 119.2(2014):753-786.
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