GSTDTAP  > 地球科学
DOI10.5194/acp-18-9411-2018
Impact of long-range transport over the Atlantic Ocean on Saharan dust optical and microphysical properties based on AERONET data
Velasco-Merino, Cristian1; Mateos, David1; Toledano, Carlos1; Prospero, Joseph M.2; Molinie, Jack3; Euphrasie-Clotilde, Lovely3; Gonzalez, Ramiro1; Cachorro, Victoria E.1; Calle, Abel1; de Frutos, Angel M.1
2018-07-05
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2018
卷号18期号:13页码:9411-9424
文章类型Article
语种英语
国家Spain; USA; Guadeloupe
英文摘要

Arid regions are a major source of mineral dust aerosol. Transport from these sources can have a great impact on aerosol climatology in distant regions. In order to assess the impact of dust on climate we must understand how dust properties change after long distance transport from sources. This study addresses the changes in columnar aerosol properties when mineral dust outbreaks from western Africa arrive over the eastern Caribbean after transport across the Atlantic Ocean, a transit of 5-7 days. We use data from the NASA Aerosol Robotic Network (AERONET) located at five Caribbean and two western Africa sites to characterize changes in columnar aerosol properties: aerosol optical depth (AOD), size distribution, single scattering albedo, and refractive indexes. We first characterized the local aerosol climatology at each site and then using air mass back trajectories we identified those days when trajectories over Caribbean sites back-tracked to western Africa. Over the period 1996-2014 we identify 3174 days, an average of 167 days per year, when the air mass over the Caribbean sites could be linked to at least one of the two western Africa sites. For 1162 of these days, AOD data are available for the Caribbean sites as well as for the corresponding western Africa sites about 5-7 days earlier, when the air mass passed over these sites. We identified dust outbreaks as those air masses yielding AOD >= 0.2 and an Angstrom exponent below 0.6. On this basis of the total 1162 days, 484 meet the criteria for mineral dust outbreaks. We observe that the AOD at 440 nm decreases by about 0.16 or 30% during transport. The volume particle size distribution shows a similar decrease in the volume concentration, mainly in the coarse mode. The single scattering albedo, refractive indexes, and asymmetry factor remain unchanged. The difference in the effective radius over western Africa sites with respect to Caribbean sites ranges between 0 and -0.3 mu m. Finally we conclude that in about half of the cases only non-spherical dust particles are present in the atmosphere over the western Africa and Caribbean sites, while in the other cases dust particles were mixed with other types of aerosol particles.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000437438000002
WOS关键词MINERAL DUST ; AFRICAN DUST ; DESERT DUST ; AEROSOL CHARACTERIZATION ; IBERIAN PENINSULA ; CARIBBEAN BASIN ; BOUNDARY-LAYER ; AIR-QUALITY ; PUERTO-RICO ; CLIMATE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29453
专题地球科学
作者单位1.Univ Valladolid, Dept Fis Teor Atom & Opt, Grp Opt Atmosfer, Valladolid, Spain;
2.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Cooperat Inst Marine & Atmospher Studies, 4600 Rickenbacker Causeway, Miami, FL 33149 USA;
3.Univ Antilles, Lab Geosci & Energy, Pointe a Pitre, Guadeloupe, Guadeloupe
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Velasco-Merino, Cristian,Mateos, David,Toledano, Carlos,et al. Impact of long-range transport over the Atlantic Ocean on Saharan dust optical and microphysical properties based on AERONET data[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(13):9411-9424.
APA Velasco-Merino, Cristian.,Mateos, David.,Toledano, Carlos.,Prospero, Joseph M..,Molinie, Jack.,...&de Frutos, Angel M..(2018).Impact of long-range transport over the Atlantic Ocean on Saharan dust optical and microphysical properties based on AERONET data.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(13),9411-9424.
MLA Velasco-Merino, Cristian,et al."Impact of long-range transport over the Atlantic Ocean on Saharan dust optical and microphysical properties based on AERONET data".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.13(2018):9411-9424.
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