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
Measurements and model simulations of the photostationary state during the Mauna Loa Observatory Photochemistry Experiment: Implications for radical concentrations and ozone production and loss rates
Brian A. Ridley,Sasha Madronich,Robert B. Chatfield,James Walega,Richard E. Shetter,Mary Anne Carroll,Denise D. Montzka +6 more
TL;DR: In this article, the photostationary state ratio (PSTR) was evaluated for clear sky conditions at Mauna Loa, Hawaii during a one-month field study in the spring of 1988, and the results indicated peroxy radical mixing ratios near 60 pptv.
Journal ArticleDOI
The Deep Convective Clouds and Chemistry (DC3) Field Campaign
Mary C. Barth,Christopher A. Cantrell,William H. Brune,Steven A. Rutledge,James H. Crawford,Heidi Huntrieser,Lawrence D. Carey,Donald R. MacGorman,Morris L. Weisman,Kenneth E. Pickering,Eric C. Bruning,Bruce E. Anderson,Eric C. Apel,Michael I. Biggerstaff,Teresa Campos,Pedro Campuzano-Jost,Ronald C. Cohen,John D. Crounse,Douglas A. Day,Glenn S. Diskin,Frank Flocke,Alan Fried,Charity Garland,Brian G. Heikes,Shawn B. Honomichl,Rebecca S. Hornbrook,L. Gregory Huey,Jose L. Jimenez,Timothy J. Lang,Michael Lichtenstern,Tomas Mikoviny,Benjamin A. Nault,Daniel O'Sullivan,Laura L. Pan,Jeff Peischl,Ilana B. Pollack,Dirk Richter,Daniel D. Riemer,Thomas B. Ryerson,Hans Schlager,Jason M. St. Clair,James Walega,Petter Weibring,Andrew J. Weinheimer,Paul O. Wennberg,Armin Wisthaler,Paul J. Wooldridge,Conrad L. Ziegler +47 more
TL;DR: The Deep Convective Clouds and Chemistry (DC3) field experiment produced an exceptional dataset on thunderstorms, including their dynamical, physical, and electrical structures and their impact on the chemical composition of the troposphere as mentioned in this paper.
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Formaldehyde Distribution over North America: Implications for Satellite Retrievals of Formaldehyde Columns and Isoprene Emission
Dylan B. Millet,Daniel J. Jacob,Solène Turquety,R. C. Hudman,Shiliang Wu,Alan Fried,James Walega,Brian G. Heikes,Donald R. Blake,Hanwant B. Singh,Bruce E. Anderson,Antony D. Clarke +11 more
TL;DR: In this paper, the authors used aircraft data collected over North America and the Atlantic to determine the local relationships between HCHO columns and VOC emissions, calculate AMFs for HCHO retrievals, assess the errors in deriving AMFs with a chemical transport model (GEOS-Chem), and draw conclusions regarding space-based mapping of VOC emission.
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Development of a tunable mid-IR difference frequency laser source for highly sensitive airborne trace gas detection.
TL;DR: The optical sensor architecture, performance characteristics of individual pump lasers and DFG, as well as its application to wavelength modulation spectroscopy employing an astigmatic Herriott multi-pass gas absorption cell are described.
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Primary and secondary sources of formaldehyde in urban atmospheres: Houston Texas region
David D. Parrish,T. B. Ryerson,Johan Mellqvist,John Johansson,Alan Fried,Dirk Richter,James Walega,Rebecca A. Washenfelder,Rebecca A. Washenfelder,J. A. de Gouw,J. A. de Gouw,Jeff Peischl,Jeff Peischl,Kenneth C. Aikin,Kenneth C. Aikin,Stuart A. McKeen,Stuart A. McKeen,Gregory J. Frost,Gregory J. Frost,Fred C. Fehsenfeld,Fred C. Fehsenfeld,Scott C. Herndon +21 more
TL;DR: In this paper, the rates of secondary production and primary emission of formaldehyde (CH2O) from petrochemical industrial facilities and on-road vehicles in the Houston Texas region were evaluated based upon ambient measurements collected during field studies in 2000, 2006 and 2009.