Assessing the regional surface influence through Backward Lagrangian Dispersion Models for aircraft CO 2 vertical profiles observations in NE Spain

摘要: Abstract. In this study the differences in measured atmospheric CO2 mixing ratio at three aircraft profiling sites NE Spain separated by 60 km are analyzed regard to variability of surface fluxes regional influence area. First, Regional Potential Surface Influence (RPSI) for fifty-one days 2006 is calculated assess vertical, horizontal and temporal extent scale (104 km2) different altitudes profile (600, 1200, 2500 4000 meters above sea level, m a.s.l.). Second, flights carried out (7 February, 24 August 29 November) following Crown Atmospheric Sampling (CAS) design presented relation between (PSI) RPSI concepts. At 600 1200 a.s.l. signal confined up 50 h before measurements whereas higher (2500 a.s.l.) only recovered during spring summer months. The from overlap 70% a.s.l., while decreases 10–40% area suitable understand concentration vertices CAS, as attributed local surrounding (February) or November flights. For these two flights, influences scale. CAS sampling appears be a method cope with typical grid inversion models intensified within PBL background every ~102 km.