Arid
DOI10.5194/acp-18-11303-2018
Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements
Song, Qianqian1,2; Zhang, Zhibo1,2; Yu, Hongbin3; Kato, Seiji4; Yang, Ping5; Colarco, Peter3; Remer, Lorraine A.2; Ryder, Claire L.6
通讯作者Zhang, Zhibo
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2018
卷号18期号:15页码:11303-11322
英文摘要

In this study, we integrate recent in situ measurements with satellite retrievals of dust physical and radiative properties to quantify dust direct radiative effects on shortwave (SW) and longwave (LW) radiation (denoted as DRESW and DRELW, respectively) in the tropical North Atlantic during the summer months from 2007 to 2010. Through linear regression of the CERES-measured top-of-atmosphere (TOA) flux versus satellite aerosol optical depth (AOD) retrievals, we estimate the instantaneous DRESW efficiency at the TOA to be -49.7 +/- 7.1 W m(-2) AOD(-1) and -36.5 +/- 4.8 W m(-2) AOD(-1) based on AOD from MODIS and CALIOP, respectively. We then perform various sensitivity studies based on recent measurements of dust particle size distribution (PSD), refractive index, and particle shape distribution to determine how the dust microphysical and optical properties affect DRE estimates and its agreement with the above-mentioned satellite-derived DREs. Our analysis shows that a good agreement with the observation-based estimates of instantaneous DRESW and DRELW can be achieved through a combination of recently observed PSD with substantial presence of coarse particles, a less absorptive SW refractive index, and spheroid shapes. Based on this optimal combination of dust physical properties we further estimate the diurnal mean dust DRESW in the region of -10 W m(-2) at TOA and -26 W m(-2) at the surface, respectively, of which similar to 30% is canceled out by the positive DRELW. This yields a net DRE of about -6.9 and -18.3 W m(-2) at TOA and the surface, respectively. Our study suggests that the LW flux contains useful information on dust particle size, which could be used together with SW observations to achieve a more holistic understanding of the dust radiative effect.


类型Article
语种英语
国家USA ; England
收录类别SCI-E
WOS记录号WOS:000441403800007
WOS关键词AIRBORNE MINERAL AEROSOLS ; INFRARED OPTICAL DEPTH ; SAHARAN DUST ; REFRACTIVE-INDEX ; DESERT DUST ; SIZE DISTRIBUTION ; BOUNDARY-LAYER ; ATMOSPHERIC TRANSPORT ; CLIMATE RESPONSE ; MODIS
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207901
作者单位1.Univ Maryland Baltimore Cty, Phys Dept, Baltimore, MD 21228 USA;
2.Univ Maryland Baltimore Cty, Joint Ctr Earth Syst Technol, Baltimore, MD 21228 USA;
3.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA;
4.NASA, Langley Res Ctr, Hampton, VA 23665 USA;
5.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX USA;
6.Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England
推荐引用方式
GB/T 7714
Song, Qianqian,Zhang, Zhibo,Yu, Hongbin,et al. Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements[J],2018,18(15):11303-11322.
APA Song, Qianqian.,Zhang, Zhibo.,Yu, Hongbin.,Kato, Seiji.,Yang, Ping.,...&Ryder, Claire L..(2018).Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(15),11303-11322.
MLA Song, Qianqian,et al."Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.15(2018):11303-11322.
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