会议专题

Estimation of Aerosol Black Carbon at the Tropopause by Measurements in Commercial Aircraft Cabins

Aerosol Black Carbon (BC) is emitted during combustion of all carbonaceous fuels. It absorbs sunlight and interacts with cloud nucleation processes, leading to direct and indirect climate forcing. Widespread measurements demonstrate the extreme variability of BC concentrations at ground level. Knowledge of the vertical distribution of BC in the atmosphere is essential for calculations of its contribution to climate change, but measurements from research aircraft are complex, expensive, and only occasional. Black carbon is a significant component of aircraft engine exhaust. Most long-range aircraft cruise at altitudes in the range of 10 to 12 km, and release BC into this layer of the atmosphere from which the rate of removal may be slow. There may therefore be a significant enhancement or accumulation of BC in this vertical range of the atmosphere. We have used the “micro Aethalometer to measure BC concentrations in the passenger cabin of commercial aircraft during conventional travel. There are no combustion sources of BC within the aircraft: air is drawn from the outside at high altitude, compressed, and pumped into the aircraft to provide ventilation for the passengers. The measured concentrations therefore represent a lower limit estimate for BC in the atmosphere at the airplane’s cruising altitude. We present data from measurements made during many long-distance flights. The results may be used to estimate the concentration of BC near the tropopause.

Aerosol Black Carbon Vertical Profile Upper Troposphere Lower Stratosphere

Anthony D. A. Hansen Grisa Mocnik

Magee Scientific,1101 Cowper Street,Berkeley,CA 94702 USA Aerosol d.o.o.,Kamniska 41,Ljubljana,SI-1000 Slovenia

国际会议

第七届亚洲气溶胶会议

西安

英文

371-375

2011-08-17(万方平台首次上网日期,不代表论文的发表时间)