Abstract：Adopting observational data of multi angle absorption photometer (MAAP-5012) and the gas composition mixing ratio data of CO and CO2 of Semi-Arid Climate Observatory and Laboratory (SACOL) from September 2009 to June 2010, the characteristics and effects of source of black carbon aerosol and carbon gas in semi-arid areas of Northwest China, and the types of emissions which have impact on the concentration of black carbon were analyzed. The result indicated that average concentrations of BC, CO and CO2 were 1.75μg/m3, 601.71×10-9 and 387.78×10-6, respectively. Hybrid Single Particle Lagrangian Integrated model (HYSPLIT-4) was used to distinguish the flow areas from eastern and western of the observation station. When the airstreams came from the east, the concentrations of BC, CO, CO2 were 1.38μg/m3, 462.79×10-9 and 383.03×10-6, respectively. When the airstreams came from the west, the concentrations of BC, CO, CO2 are 2.2μg/m3, 768.38×10-9 and 393.47×10-6, respectively. Taking the clustering analysis on the origin places of the airstreams in the height of 500m, 1500m and 3000m, get the results that when the airstreams of different height flow respective from the Middle East, Central Asia, and Europe, the concentrations of BC, CO, CO2 were higher and the values of △BC/△CO, △CO/△CO2 were larger, indicating the efficiency of fuel combustion was lower; when the airstreams transmits from Central and Northern China, the concentrations of BC, CO, CO2 were lower, and the values of △BC/△CO, △CO/△CO2 were smaller, indicating the efficiency of fuel combustion is higher.
