Observed influence of liquid cloud microphysical properties on ultraviolet surface radiation

被引：12
作者：
Mateos, D. [1 ]
Pace, G. [2 ]
Meloni, D. [2 ]
Bilbao, J. [1 ]
di Sarra, A. [2 ]
de Miguel, A. [1 ]
Casasanta, G. [3 ]
Min, Q. [4 ]
机构：
[1] Univ Valladolid, Atmosphere & Energy Lab, Valladolid, Spain
[2] ENEA UTMEA TER, Rome, Italy
[3] CNR, Inst Atmospher Sci & Climate, Rome, Italy
[4] SUNY Albany, Atmospher Sci Res Ctr, Albany, NY 12222 USA
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2014年 / 119卷 / 05期
关键词：
cloud microphysical properties; liquid water path; cloud droplet effective radius; actinic flux; solar irradiance; UVI and J((OD)-D-1); SPECTRAL ACTINIC FLUX; ROTATING SHADOWBAND RADIOMETER; ABSORPTION CROSS-SECTIONS; OZONE UV SPECTROSCOPY; OPTICAL-PROPERTIES; LOWER TROPOSPHERE; SOFTWARE PACKAGE; WATER CLOUDS; AEROSOL; IRRADIANCE;
D O I：
10.1002/2013JD020309
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
Measurements of different UV quantities (UV index, ozone photolysis rates, global and diffuse irradiances, and actinic flux spectra) and cloud properties were collected during a field campaign carried out in Southern Italy in May-June 2010. Independent measurements of cloud liquid water path and optical depth allowed retrieving the cloud effective radius. The cloud modification factor (CMF) is used to investigate the influence of liquid cloud properties on the UV radiation under overcast conditions. CMF was also simulated using a 1-D radiative transfer model. Experimental and simulated CMF values for UV index (under overcast conditions) show a normalized root-mean-square error around 11%. Clouds with small effective radius determine a higher UV radiation attenuation than clouds formed by large particles. The CMFs for the UV index and the global spectral irradiance show a very weak dependence on the solar zenith angle (SZA), while the CMFs for actinic flux (both integrated and spectral) and diffuse spectral irradiance show a variation with SZA. The irradiance is more effectively attenuated at low SZA, while the actinic flux at high SZA. These effects are due to the different weight given to the direct and the diffuse components. Key Points <list list-type="bulleted" id="jgrd51174-list-0001"> <list-item id="jgrd51174-li-0001">Experimental values of cloud microphysical properties and UV radiative flux <list-item id="jgrd51174-li-0002">Small cloud particles cause stronger attenuation of UV radiative fluxes <list-item id="jgrd51174-li-0003">Measurements and simulations (irradiance and actinic flux) are in good agreement
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页码：2429 / 2440
页数：12
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