Region of influence of 13 remote European measurement sites based on modeled carbon monoxide mixing ratios

摘要: [1] The regions of influence (ROIs) 13 European rural background and high-altitude measurement sites are quantified based on modeled carbon monoxide (CO) mixing ratios. The ratios have a 3-hourly time resolution obtained by combining regional scale, time-reversed Lagrangian particle dispersion modeling with gridded CO inventory data. ROIs individual sites, defined as the area whose surface emissions account for 80% ratios, typically cover an few times 105 km2, independent altitude site. Their geographical shape is influenced spatial distribution emissions, mountain ranges, prevailing westerly winds in Europe. Depending site, between 20% variability cannot be explained changing atmospheric transport patterns must ascribed to inhomogeneity emission sources instead. use time-dependent has additional 25% effect Neither average nor their indicative any these site-specific properties. As rule thumb, results suggest that intended regional-scale monitoring should not separated more than 600 km achieve good coverage.