14. ATTRIBUTION OF WINTERTIME ANTICYCLONIC STAGNATION CONTRIBUTING TO AIR POLLUTION IN WESTERN EUROPE: Climate simulations suggest a potential increase in frequency of stagnant wintertime conditions that prevailed over northwestern Europe in December 2016: it is significant in one multimodel ensemble but not in two single-model ensembles

Introduction. In December 2016, western European weather was dominated by persistent anticyclonic conditions (Fig. 14.1a) leading to dry and calm weather. At this time of year, solar radiation does not [...]