J
James Walega
Researcher at Institute of Arctic and Alpine Research
Publications - 147
Citations - 7709
James Walega is an academic researcher from Institute of Arctic and Alpine Research. The author has contributed to research in topics: Troposphere & Spectrometer. The author has an hindex of 51, co-authored 144 publications receiving 6953 citations. Previous affiliations of James Walega include National Center for Atmospheric Research & University of Colorado Boulder.
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Journal ArticleDOI
Chemical mechanisms of acid generation in the troposphere
Jack G. Calvert,Allan L. Lazrus,Gregory L. Kok,Brian G. Heikes,James Walega,John A. Lind,Christopher A. Cantrell +6 more
TL;DR: In this article, it was shown that gaseous hydrogen peroxide is a major oxidant leading to sulphuric acid generation in cloud water, and computer simulations can now rationalize the observed seasonal trends.
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Emissions from biomass burning in the Yucatan
Robert J. Yokelson,John D. Crounse,Peter F. DeCarlo,Peter F. DeCarlo,Thomas Karl,Shawn Urbanski,Elliot Atlas,Teresa Campos,Yohei Shinozuka,Vladimir N. Kapustin,Antony D. Clarke,Andrew J. Weinheimer,D. J. Knapp,Denise D. Montzka,John S. Holloway,Petter Weibring,Frank Flocke,W. Zheng,Darin W. Toohey,Paul O. Wennberg,Christine Wiedinmyer,L. Mauldin,Alan Fried,Dirk Richter,James Walega,Jose L. Jimenez,Kouji Adachi,Peter R. Buseck,Samuel R. Hall,Richard E. Shetter +29 more
TL;DR: The first detailed field measurements of biomass burning (BB) emissions in the Northern Hemisphere tropics as part of the MILAGRO project were made by two instrumented aircraft were the National Center for Atmospheric Research C-130 and a University of Montana/US Forest Service Twin Otter.
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Analysis of the atmospheric distribution, sources, and sinks of oxygenated volatile organic chemicals based on measurements over the Pacific during TRACE‐P
Hanwant B. Singh,L. J. Salas,Robert B. Chatfield,E. Czech,Alan Fried,James Walega,Mathew J. Evans,B. S. Field,Daniel J. Jacob,Donald R. Blake,Brian G. Heikes,Robert W. Talbot,G. W. Sachse,James H. Crawford,Melody A. Avery,Scott T. Sandholm,Henry E. Fuelberg +16 more
TL;DR: In this article, a large number of oxygenated volatile organic chemicals (OVOC) measurements were carried out in the Pacific troposphere (0.1-12 km) in winter/spring of 2001 (24 February to 10 April).
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Organic aerosol formation in urban and industrial plumes near Houston and Dallas, Texas
Roya Bahreini,Roya Bahreini,Barbara Ervens,Barbara Ervens,Ann M. Middlebrook,Carsten Warneke,Carsten Warneke,J. A. de Gouw,J. A. de Gouw,Peter F. DeCarlo,Peter F. DeCarlo,Jose L. Jimenez,Jose L. Jimenez,Charles A. Brock,J. A. Neuman,J. A. Neuman,T. B. Ryerson,Harald Stark,Harald Stark,Elliot Atlas,Jerome Brioude,Jerome Brioude,Alan Fried,John S. Holloway,John S. Holloway,Jeff Peischl,Jeff Peischl,Dirk Richter,James Walega,Petter Weibring,A. G. Wollny,A. G. Wollny,Fred C. Fehsenfeld,Fred C. Fehsenfeld +33 more
TL;DR: In this article, the authors used a chemical box model to simulate secondary organic aerosol (SOA) formation from anthropogenic and biogenic VOCs in different plumes using recently reported dependencies of SOA yields on VOC/NOx ratios.
Journal ArticleDOI
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring
J. Mao,Daniel J. Jacob,Mathew J. Evans,Jennifer R. Olson,Xinrong Ren,William H. Brune,J. M. St. Clair,John D. Crounse,K. M. Spencer,M. R. Beaver,Paul O. Wennberg,Michael J. Cubison,Jose-Luis Jimenez,Alan Fried,Petter Weibring,James Walega,Samuel R. Hall,Andrew J. Weinheimer,Ronald C. Cohen,G. Chen,James H. Crawford,Cameron S. McNaughton,Antony D. Clarke,Lyatt Jaeglé,Jenny A. Fisher,Robert M. Yantosca,P. Le Sager,P. Le Sager,C. Carouge +28 more
TL;DR: In this paper, the authors used observations from the April 2008 NASA ARCTAS aircraft campaign to the North American Arctic, interpreted with a global 3D chemical transport model (GEOS-Chem), to better understand the sources and cycling of hydrogen oxide radicals (HOx≡H+OH+peroxy radicals) and their reservoirs (HOy≡HOx+peroxides) in the springtime Arctic atmosphere.