Arid
DOI10.1002/2014JD022312
Altitude-resolved shortwave and longwave radiative effects of desert dust in the Mediterranean during the GAMARF campaign: Indications of a net daily cooling in the dust layer
Meloni, D.1; Junkermann, W.2; di Sarra, A.1; Cacciani, M.3; De Silvestri, L.1; Di Iorio, T.1; Estelles, V.4; Gomez-Amo, J. L.1,4; Pace, G.1; Sferlazzo, D. M.5
通讯作者Meloni, D.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
EISSN2169-8996
出版年2015
卷号120期号:8页码:3386-3407
英文摘要

Desert dust interacts with shortwave (SW) and longwave (LW) radiation, influencing the Earth radiation budget and the atmospheric vertical structure. Uncertainties on the dust role are large in the LW spectral range, where few measurements are available and the dust optical properties are not well constrained. The first airborne measurements of LW irradiance vertical profiles over the Mediterranean were carried out during the Ground-based and Airborne Measurements of Aerosol Radiative Forcing (GAMARF) campaign, which took place in spring 2008 at the island of Lampedusa. The experiment was aimed at estimating the vertical profiles of the SW and LW aerosol direct radiative forcing (ADRF) and heating rates (AHR), taking advantage of vertically resolved measurements of irradiances, meteorological parameters, and aerosol microphysical and optical properties. Two cases, characterized respectively by the presence of a homogeneous dust layer (3 May, with aerosol optical depth, AOD, at 500nm of 0.59) and by a low aerosol burden (5 May, with AOD of 0.14), are discussed. A radiative transfer model was initialized with the measured vertical profiles and with different aerosol properties, derived from measurements or from the literature. The simulation of the irradiance vertical profiles, in particular, provides the opportunity to constrain model-derived estimates of the AHR. The measured SW and LW irradiances were reproduced when the model was initialized with the measured aerosol size distributions and refractive indices. For the dust case, the instantaneous (solar zenith angle, SZA, of 55.1 degrees) LW-to-SW ADRF ratio was 23% at the surface and 11% at the top of the atmosphere (TOA), with a more significant LW contribution on a daily basis (52% at the surface and 26% at TOA), indicating a relevant reduction of the SW radiative effects. The AHR profiles followed the aerosol extinction profile, with comparable peaks in the SW (0.720.11 Kd(-1)) and in the LW (-0.520.12 Kd(-1)) for the considered SZA. On a daily basis, the absolute value of the heating rate was larger in the LW than in the SW, producing a net cooling effect at specific levels. These are quite unexpected results, emphasizing the important role of LW radiation.


英文关键词shortwave and longwave radiation desert dust aerosol direct radiative forcing and heating rate airborne measurements aerosol optical properties radiative transfer model
类型Article
语种英语
国家Italy ; Germany ; Spain
收录类别SCI-E
WOS记录号WOS:000354826100023
WOS关键词SAHARAN DUST ; OPTICAL-PROPERTIES ; SIZE DISTRIBUTIONS ; REFRACTIVE-INDEX ; ATMOSPHERIC CO2 ; SOLAR-RADIATION ; HEATING RATES ; WATER-VAPOR ; CIMEL CE318 ; ASIAN DUST
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/2XILL650/188675
作者单位1.ENEA, Lab Earth Observat & Anal, Rome, Italy;
2.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Garmisch Partenkirchen, Germany;
3.Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy;
4.Univ Valencia, Dept Earth Phys & Thermodynam, E-46100 Burjassot, Spain;
5.ENEA, Lab Earth Observat & Anal, Lampedusa, Italy
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Meloni, D.,Junkermann, W.,di Sarra, A.,et al. Altitude-resolved shortwave and longwave radiative effects of desert dust in the Mediterranean during the GAMARF campaign: Indications of a net daily cooling in the dust layer[J],2015,120(8):3386-3407.
APA Meloni, D..,Junkermann, W..,di Sarra, A..,Cacciani, M..,De Silvestri, L..,...&Sferlazzo, D. M..(2015).Altitude-resolved shortwave and longwave radiative effects of desert dust in the Mediterranean during the GAMARF campaign: Indications of a net daily cooling in the dust layer.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,120(8),3386-3407.
MLA Meloni, D.,et al."Altitude-resolved shortwave and longwave radiative effects of desert dust in the Mediterranean during the GAMARF campaign: Indications of a net daily cooling in the dust layer".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 120.8(2015):3386-3407.
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