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. This study analyzed the aerosol optical propertiesderived by SKYRAD.pack versions 5.0 and 4.2 (referred to as V5.0 and V4.2)using the radiometer measurements over Qionghai and Yucheng in China, twonew sites of the sky radiometer network (SKYNET). As V5.0 uses an a priorisize distribution function (SDF) of a bimodal log-normal function, thevolume size distribution retrieved by V5.0 presented bimodal patterns with a0.1–0.2 µm fine particle mode and a 3.0–6.0 µm coarse particlemode both over Qionghai and Yucheng. The differences in the volume sizedistributions between the two versions were very large for the coarse modewith a radius of over 5 µm. The single scattering albedos (SSAs)by V5.0 correlated with SSAs by V4.2 with R=0.88, 0.87, 0.90, 0.88, and0.92 at wavelengths of 400, 500, 670, 870, and 1020 nm over Qionghai,respectively. The correlation coefficients were around 0.95, 0.95, 0.96,0.94, and 0.91 at the five channels in Yucheng. An error of ±5 %for the solid view angle (SVA) introduced about ±2 % differences inretrieved SSA values both by V4.2 and V5.0. An error of ±50 % forground surface albedo (Ag) caused about 1 % averaged differences inretrieved SSA values by the two versions. With the atmospheric pressure(PRS) increased by 1 %, 2 %, 3 %, and 4 %, the averaged changes inSSAs did not exceed 0.8 % both by V4.2 and V5.0. The SSA differences at500 nm between the two versions decreased, while aerosol optical depths (AODs) increased over bothsites. The seasonal variability of the aerosol properties over Qionghai andYucheng was investigated based on SKYRAD.pack V5.0. The seasonal averagedAOD over Qionghai had higher values in spring, winter, and autumn and lowervalues in summer. The AOD averages were commonly higher in summer and springthan in winter and autumn in Yucheng. The lowest seasonal averaged SSAs wereboth observed in winter at the two sites. The fraction of the fine aerosolparticles was much smaller in summer than in other seasons over Qionghai;the volume fraction of the coarse-mode particle in Yucheng had much largervalues compared to the fine-mode particle in all seasons. The validationresults provide valuable references for continued improvement of theretrieval algorithms of SKYNET and other aerosol observational networks.

atmospheric measurement techniques

Intercomparison between the aerosol optical properties retrieved by different inversion methods from SKYNET sky radiometer observations over Qionghai and Yucheng in China