GSTDTAP  > 地球科学
DOI10.5194/acp-20-1565-2020
Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic
LeBlanc, Samuel E.1,2; Redemann, Jens3; Flynn, Connor3; Pistone, Kristina1,2; Kacenelenbogen, M. S.2; Segal-Rosenheimer, Michal1,4; Shinozuka, Yohei2,5; Dunagan, Stephen2; Dahlgren, Robert P.2,6; Meyer, Kerry7; Podolske, James2; Howell, Steven G.8; Freitag, Steffen8; Small-Griswold, Jennifer8; Holben, Brent7; Diamond, Michael9; Wood, Robert9; Formenti, Paola10,11; Piketh, Stuart J.12; Maggs-Kolling, Gillian13; Gerber, Monja14; Namwoonde, Andreas14
2020-02-07
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2020
卷号20期号:3页码:1565-1590
文章类型Article
语种英语
国家USA; Israel; France; South Africa; Namibia
英文摘要

The southeast Atlantic (SEA) region is host to a climatologically significant biomass burning aerosol layer overlying marine stratocumulus. We present the first results of the directly measured above-cloud aerosol optical depth (ACAOD) from the recent ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) airborne field campaign during August and September 2016. In our analysis, we use data from the Spectrometers for Sky-Scanning Sun-Tracking Atmospheric Research (4STAR) instrument and found an average ACAOD of 0.32 at 501 nm (range of 0.02 to 1.04), with an average angstrom ngstrom exponent (AE) above clouds of 1.71. The AE is much lower at 1.25 for the full column (including below-cloud-level aerosol, with an average of 0.36 at 501 nm and a range of 0.02 to 0.74), indicating the presence of large aerosol particles, likely marine aerosol, in the lower atmospheric column. The ACAOD is observed from 4STAR to be highest near the coast at about 12 degrees S, whereas its variability is largest at the southern edge of the average aerosol plume, as indicated by 12 years of MODIS observations. In comparison to MODIS-derived ACAOD and long-term fine-mode plume-average AOD along a diagonal routine track extending out from the coast of Namibia, the directly measured ACAOD from 4STAR is slightly lower than the ACAOD product from MODIS. The peak ACAOD expected from MODIS AOD retrievals averaged over a long term along the routine diagonal flight track (peak of 0.5) was measured to be closer to coast in 2016 at about 1.5-4 degrees E, with 4STAR ACAOD averages showing a peak of 0.42. When considering the full observation set over the SEA, by spatially binning each sampled AOD, we obtain a geographically representative mean ACAOD of 0.37. Vertical profiles of AOD showcase the variability in the altitude of the aerosol plume and its separation from the cloud top. We measured larger AOD at a high altitude near the coast than farther from the coast, while generally observing a larger vertical gap farther from the coast. Changes in AOD with altitude are correlated with carbon monoxide, a gas tracer of the biomass burning aerosol plume. Vertical extent of gaps between aerosol and cloud show a wide distribution, with a near-zero gap being most frequent. The gap distribution with longitude is observed to be largest at about 7 degrees E, farther from coast than expected from previous studies.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000513068100006
WOS关键词OPAQUE WATER CLOUDS ; ABSORBING AEROSOLS ; SENSITIVITY-ANALYSIS ; SIZE DISTRIBUTIONS ; ANGSTROM EXPONENT ; FIELD CAMPAIGN ; SAFARI 2000 ; RETRIEVAL ; SMOKE ; POLLUTION
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/278609
专题地球科学
作者单位1.Bay Area Environm Res Inst, Moffett Field, CA 94035 USA;
2.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA;
3.Univ Oklahoma, Norman, OK 73019 USA;
4.Tel Aviv Univ, Porter Sch Environm & Earth Sci, Dept Geophys & Planetary Sci, Tel Aviv, Israel;
5.Univ Space Res Assoc, Columbia, MD USA;
6.Calif State Univ Monterey Bay Seaside, Seaside, CA USA;
7.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA;
8.Univ Hawaii Manoa, Honolulu, HI 96822 USA;
9.Univ Washington, Seattle, WA 98195 USA;
10.Univ Paris Est Creteil, UMR CNRS 7583, LISA, Creteil, France;
11.Univ Paris Diderot, Inst Pierre Simon Lapl, Creteil, France;
12.North West Univ, Potchefstroom, South Africa;
13.Gobabeb Res & Training Ctr, Gobabeb, Namibia;
14.Univ Namibia, Sam Nujoma Marine & Coastal Resources Res Ctr SAN, Henties Bay, Namibia
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LeBlanc, Samuel E.,Redemann, Jens,Flynn, Connor,et al. Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(3):1565-1590.
APA LeBlanc, Samuel E..,Redemann, Jens.,Flynn, Connor.,Pistone, Kristina.,Kacenelenbogen, M. S..,...&Namwoonde, Andreas.(2020).Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(3),1565-1590.
MLA LeBlanc, Samuel E.,et al."Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.3(2020):1565-1590.
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