Warming of the Arctic lower stratosphere by light absorbing particle

Recent measurements of light absorbing particles in the Arctic lower stratosphere show significantly higher mass concentrations of black carbon than were measured in 1992. The difference is primarily a result of measurements with a more quantitative and accurate technique than was previously used. We attribute the large amount of light absorbing material to transport from lower latitude, tropospheric sources rather than increases in aircraft emissions.

- D. Baumgardner,1 G. Kok,1,2 and G. Raga1

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