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In this paper, the diurnal variations of aerosol optical properties andtheir influences on the estimation of daily average direct aerosol radiativeeffect (DARE) in the North China Plain (NCP) are investigated based onin situ measurements from Haze in China campaign. For ambient aerosol, thediurnal patterns of single scattering albedo (SSA) and asymmetry factor(g) in the NCP are both highest at dawn and lowest in the late afternoon,and quite different from those of dry-state aerosol. The relative humidity(RH) is the dominant factor which determines the diurnal pattern of SSA and gfor ambient aerosol. Basing on the calculated SSA and g, several cases aredesigned to investigate the impacts of the diurnal changes of aerosoloptical properties on DARE. The results demonstrate that the diurnal changesof SSA and g in the NCP have significant influences on the estimation of DAREat the top of the atmosphere (TOA). If the full temporal coverage of aerosoloptical depth (AOD), SSA and g are available, an accurate estimation of dailyaverage DARE can be achieved by using the daily averages of AOD, SSA and g.However, due to the lack of full temporal coverage data sets of SSA and g,their daily averages are usually not available. Basing on the results ofdesigned cases, if the RH plays a dominant role in the diurnal variations ofSSA and g, we suggest that using both SSA and g averaged over early morning andlate afternoon as inputs for radiative transfer model to improve theaccurate estimation of DARE. If the temporal samplings of SSA or g are too fewto adopt this method, either averaged over early morning or late afternoonof both SSA and g can be used to improve the estimation of DARE at the TOA

Diurnal variations of aerosol optical properties in the North China Plain and their influences on the estimates of direct aerosol radiative effect