A. Baker
University of California, Irvine
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Publication
Featured researches published by A. Baker.
Journal of Geophysical Research | 2007
Carsten Warneke; S. A. McKeen; J. A. de Gouw; Paul D. Goldan; William C. Kuster; John S. Holloway; Eric J. Williams; D. D. Parrish; M. Trainer; F. C. Fehsenfeld; Shuji Kato; E. Atlas; A. Baker; D. R. Blake
[1]xa0During the NEAQS-ITCT2k4 campaign in New England, anthropogenic VOCs and CO were measured downwind from New York City and Boston. The emission ratios of VOCs relative to CO and acetylene were calculated using a method in which the ratio of a VOC with acetylene is plotted versus the photochemical age. The intercept at the photochemical age of zero gives the emission ratio. The so determined emission ratios were compared to other measurement sets, including data from the same location in 2002, canister samples collected inside New York City and Boston, aircraft measurements from Los Angeles in 2002, and the average urban composition of 39 U.S. cities. All the measurements generally agree within a factor of two. The measured emission ratios also agree for most compounds within a factor of two with vehicle exhaust data indicating that a major source of VOCs in urban areas is automobiles. A comparison with an anthropogenic emission database shows less agreement. Especially large discrepancies were found for the C2-C4 alkanes and most oxygenated species. As an example, the database overestimated toluene by almost a factor of three, which caused an air quality forecast model (WRF-CHEM) using this database to overpredict the toluene mixing ratio by a factor of 2.5 as well. On the other hand, the overall reactivity of the measured species and the reactivity of the same compounds in the emission database were found to agree within 30%.
Journal of Geophysical Research | 2008
Nicola J. Blake; J. Elliott Campbell; S. A. Vay; Henry E. Fuelberg; L. Gregory Huey; Glen W. Sachse; Simone Meinardi; A. J. Beyersdorf; A. Baker; Barbara Barletta; J. R. Midyett; Lambert A. Doezema; M. A. Kamboures; Jennifer McAdams; B. J. Novak; F. Sherwood Rowland; D. R. Blake
[1]xa0An extensive set of carbonyl sulfide (OCS) observations were made as part of the NASA Intercontinental Chemical Transport Experiment–North America (INTEX-NA) study, flown from 1 July to 14 August 2004 mostly over the eastern United States and Canada. These data show that summertime OCS mixing ratios at low altitude were dominated by surface drawdown and were highly correlated with CO2. Although local plumes were observed on some low-altitude flight legs, anthropogenic OCS sources were small compared to this sink. These INTEX-NA observations were in marked contrast to the early springtime 2001 Transport and Chemical Evolution over the Pacific experiment, which sampled Asian outflow dominated by anthropogenic OCS emissions. To test the gridded OCS fluxes used in past models, the INTEX-NA observations were combined with the sulfur transport Eulerian model (STEM) regional atmospheric chemistry model for a top-down assessment of bottom-up OCS surface fluxes for North America. Initial STEM results suggest that the modeled fluxes underestimate the OCS plant sink by more than 200%.
Atmospheric Environment | 2008
A. Baker; A. J. Beyersdorf; Lambert A. Doezema; Aaron S. Katzenstein; Simone Meinardi; Isobel J. Simpson; D. R. Blake; F. Sherwood Rowland
Atmospheric Chemistry and Physics | 2009
Eric C. Apel; Louisa Kent Emmons; Thomas Karl; F. Flocke; Alan J. Hills; Sasha Madronich; Julia Lee-Taylor; Alan Fried; Petter Weibring; James G. Walega; Dirk Richter; X. Tie; L. R. Mauldin; Teresa L. Campos; Andrew J. Weinheimer; D. J. Knapp; Barkley C. Sive; Lawrence I. Kleinman; Stephen R. Springston; Rahul A. Zaveri; John V. Ortega; P. Voss; D. R. Blake; A. Baker; Carsten Warneke; D. Welsh-Bon; J. A. de Gouw; Jun Zheng; R. Zhang; J. Rudolph
Atmospheric Chemistry and Physics | 2008
J. A. de Gouw; D. Welsh-Bon; Carsten Warneke; William C. Kuster; L. M. Alexander; A. Baker; A. J. Beyersdorf; D. R. Blake; Manjula R. Canagaratna; A. T. Celada; L. G. Huey; W. Junkermann; Timothy B. Onasch; Alejandro Salcido; S. J. Sjostedt; Amy P. Sullivan; David J. Tanner; O. Vargas; Rodney J. Weber; Douglas R. Worsnop; Xiao-Ying Yu; Rahul A. Zaveri
Atmospheric Chemistry and Physics | 2009
S. Dusanter; Deepali Vimal; Philip S. Stevens; R. Volkamer; Luisa T. Molina; A. Baker; Simone Meinardi; D. R. Blake; P. M. Sheehy; A. Merten; R. Zhang; Jun Zheng; Ed Fortner; W. Junkermann; Madan Dubey; Thomas A. Rahn; B. Eichinger; Piotr Andrzej Lewandowski; John H. Prueger; H. Holder
Atmospheric Chemistry and Physics | 2008
Colette L. Heald; Allen H. Goldstein; J. D. Allan; A. C. Aiken; Eric C. Apel; E. Atlas; A. Baker; T. S. Bates; A. J. Beyersdorf; D. R. Blake; Teresa L. Campos; Hugh Coe; John D. Crounse; P. F. DeCarlo; J. A. de Gouw; E. J. Dunlea; F. Flocke; Alan Fried; Paul D. Goldan; Robert J. Griffin; Scott C. Herndon; John S. Holloway; R. Holzinger; Jose L. Jimenez; W. Junkermann; William C. Kuster; Alastair C. Lewis; Simone Meinardi; Dylan B. Millet; Timothy B. Onasch
Atmospheric Chemistry and Physics | 2011
Julia Lee-Taylor; Sasha Madronich; B. Aumont; A. Baker; Marie Camredon; Alma Hodzic; Geoffrey S. Tyndall; Eric C. Apel; Rahul A. Zaveri
Atmospheric Chemistry and Physics | 2010
D. K. Farmer; A. E. Perring; P. J. Wooldridge; D. R. Blake; A. Baker; Simone Meinardi; L. G. Huey; David J. Tanner; O. Vargas; R. C. Cohen
Journal of Geophysical Research | 2007
Carsten Warneke; S. A. McKeen; J. A. de Gouw; Paul D. Goldan; William C. Kuster; John S. Holloway; Eric J. Williams; D. D. Parrish; M. Trainer; F. C. Fehsenfeld; Shuji Kato; E. Atlas; A. Baker; D. R. Blake
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Cooperative Institute for Research in Environmental Sciences
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