William R. Simpson

TL;DR: In this paper, the authors used observations from the Cheeka Peak Observatory in northwestern Washington State during March-April, 1997, to show that Asian anthropogenic emissions significantly impact the concentrations of a large number of atmospheric species in the air arriving to North America during spring.

TL;DR: In the polar regions, unique photochemistry converts inert halide salt ions (e.g. Br−) into reactive halogen species that deplete ozone in the boundary layer to near zero levels as discussed by the authors.

TL;DR: In this paper, the authors consider the nature of snow at a fundamental, physical level; photochemical processes within snow and the caveats needed for comparison to atmospheric photochemistry; our current understanding of nitrogen, oxidant, halogen and organic photochemistry within snow; the current limitations faced by the field and implications for the future.

TL;DR: Reactive halogen species are potent oxidizers for organic and inorganic compounds throughout the troposphere and are powerful climate forcing agents through direct and indirect radiative effects.

TL;DR: In this article, the potential of remote sensing methods to obtain information on some snow physical variables such as grain size, liquid water content and snow depth is discussed, and the possibilities for and difficulties of building a snow photochemistry model by adapting current snow physics models are explored.