Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2013JD020046 |
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
![]() |
ISSN | 2169-897X |
EISSN | 2169-8996 |
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 |
推荐引用方式 GB/T 7714 | 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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。