A trajectory climatology for Svalbard; investigating how atmospheric flow patterns influence observed tracer concentrations

摘要: A 10-year climatology of long-range atmospheric transport to Ny-Alesund, Svalbard (78.9°N, 11.9°E) is developed using three-dimensional 5-day back-trajectories. We calculate trajectories arriving twice daily at 950, 850 and 750 hPa during 1992–2001, European Centre for Medium-Range Weather Forecasts (ECMWF) analyzed wind fields. Cluster analysis used classify the into distinct patterns. The clustering procedure performed on whole set trajectories, study both year-to-year month-to-month variability in synoptic-scale circulation. identify eight major patterns which we find be consistent with mean-pressure charts Arctic region. distribution between these flows similar all years period. However, there are seasonal differences when different clusters most prevalent. calculated provide an indication source regions pathways influencing times year. Such information valuable interpreting measured time-series trace gases aerosols could serve as guidance formulating sampling strategies. compare trajectory CO2 measurements what degree flow influence CO2. Overall see a linkage concentration large-scale For instance, connection over Europe Siberia winter, high mixing ratios observed, whereas originating from Atlantic associated low concentrations. some periods individual no conclusive transport. This can due combination complex structure sources sinks its relatively long turn-over time. 222Rn model MATCH further illustrate characteristics