Beschreibung:
Several regions worldwide have seen significant trends in anthropogenic aerosol emissionsduring the period of detailed satellite observations since 2001. Over Europe (EUR) and North America(NAM) there were strong declines, over China increases then declines and over India, strong increases.Regional trends in model-simulated aerosol optical depth (AOD) and cloud radiative effects in boththe Fifth and Sixth Coupled Model Intercomparison Projects (CMIP5 and CMIP6) are broadly consistentwith the ones from satellite retrievals in most parts of EUR, NAMand India. CMIP6 models bettermatch satellite-derived AOD trend in western NAM(increasing) and eastern China (decreasing), whereCMIP5 models failed, pointing to improved anthropogenic aerosol emissions. Drop concentration trends inboth observations and models qualitatively match AOD trends. The result for solar cloud radiative effect inmodels, however, is due to compensating errors: Models fail to reproduce observed liquid water pathtrends and show, in turn, opposite trends in cloud fraction.