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William R. Simpson
Researcher at University of Alaska Fairbanks
Publications - 114
Citations - 7058
William R. Simpson is an academic researcher from University of Alaska Fairbanks. The author has contributed to research in topics: Snow & Arctic. The author has an hindex of 40, co-authored 101 publications receiving 6388 citations. Previous affiliations of William R. Simpson include Stanford University & Ohio State University.
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Journal ArticleDOI
Transport of Asian air pollution to North America
Daniel A. Jaffe,Theodore L. Anderson,D. S. Covert,Robert A. Kotchenruther,Barbara Trost,Jen Danielson,William R. Simpson,Terje Koren Berntsen,Sigrún Karlsdóttir,Donald R. Blake,Joyce M. Harris,Greg Carmichael,Itsushi Uno +12 more
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.
Journal ArticleDOI
Halogens and their role in polar boundary-layer ozone depletion
William R. Simpson,R. von Glasow,K. Riedel,Philip S. Anderson,Parisa A. Ariya,Jan W. Bottenheim,John P. Burrows,Lucy J. Carpenter,Udo Frieß,Michael Evan Goodsite,Dwayne E. Heard,Manuel A. Hutterli,Hans-Werner Jacobi,Lars Kaleschke,Basil Neff,John M. C. Plane,Ulrich Platt,Andreas Richter,Howard K. Roscoe,Rolf Sander,Paul B. Shepson,John R. Sodeau,Alexandra Steffen,Tanja Wagner,Tanja Wagner,Eric W. Wolff +25 more
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.
Journal ArticleDOI
An overview of snow photochemistry: evidence, mechanisms and impacts
Amanda M. Grannas,Anna E. Jones,Jack E. Dibb,Markus Ammann,Cort Anastasio,H. J. Beine,Michael H. Bergin,Jan W. Bottenheim,C. S. Boxe,Glenn Carver,G. Chen,James H. Crawford,Florent Domine,Markus M. Frey,Markus M. Frey,Marcelo I. Guzman,Marcelo I. Guzman,Dwayne E. Heard,Detlev Helmig,Michael R. Hoffmann,Richard E. Honrath,L. G. Huey,Manuel A. Hutterli,Hans-Werner Jacobi,Petr Klán,Barry Lefer,J. C. McConnell,John M. C. Plane,Rolf Sander,Joel Savarino,Paul B. Shepson,William R. Simpson,John R. Sodeau,R. von Glasow,Rolf Weller,Eric W. Wolff,Tong Zhu +36 more
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.
Journal ArticleDOI
Tropospheric Halogen Chemistry: Sources, Cycling,and Impacts
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.
Journal ArticleDOI
Snow physics as relevant to snow photochemistry
Florent Domine,Mary R. Albert,Thomas Huthwelker,Hans-Werner Jacobi,Hans-Werner Jacobi,Alexander A. Kokhanovsky,Michael Lehning,Ghislain Picard,William R. Simpson +8 more
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.