2McGuffie K,Henderson-Sellerst A.Almost a century of "imaging" clouds over the whole-sky dome.Bulletin American Meteorological Society,1989,70(10):1243-1253
4Sabburg J M,Long C N.Improved sky imaging for studies of enhanced UV irradiance.Atmospheric Chemistry and Physics Discussions,2004,(4):6213-6238
5Pfister G,McKenzie R L,Liley J B,et al.Cloud coverage based on all-sky imaging and its impact on surface solar irradiance.Journal of Applied Meteorology,2003,(42):1421-1434
9Bais A F,Madronich S,Crawford J,et al.International photolysis frequency measurement and model intercomparison (IPMMI):Spectral actinic solar flux measurements and modeling.Journal of Geophysical Research,2003,108:D16
10Mayer B,Seckmeyer G.Systematic long-term comparison of spectral UV measurements and UVSPEC modeling results.Journal of Geophysical Research,1997,102(D7):8755-8767