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The relationships between aerosol optical depth (AOD), cloud cover (CC), andcloud top pressure (CTP) over three major urban clusters in China are studiedunder different sea level pressure (SLP) and water vapor (WV) regimes using adecade (2003–2013) of MODIS satellite-retrieved data. Over all urbanclusters, for all SLP regimes, CC is found to increase with AOD, thuspointing out that the CC dependence on AOD cannot be explained by synopticcovariation, as approximated by SLP, alone. WV is found to have a strongerimpact on CC than AOD. This impact is more pronounced at high aerosol loadthan at low aerosol load. Hence, studies of AOD–CC relationships, based onsatellite data, will greatly overestimate the AOD impact on CC in regionswhere AOD and WV have similar seasonal variations, while they will probablyunderestimate the AOD impact in regions where AOD and WV have oppositeseasonal variations. Further, this impact shows that the hydrological cycleinterferes with the aerosol climatic impact and we need to improve ourunderstanding of this interference. Our results also suggest that studiesattributing CTP long-term changes to changes in aerosol load might have a WVbias

A study of the impact of synoptic weather conditions and water vapor on aerosol–cloud relationships over major urban clusters of China