William Wallace McMillan
University of Maryland, Baltimore County
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Featured researches published by William Wallace McMillan.
Geophysical Research Letters | 2005
William Wallace McMillan; Christopher D. Barnet; L. Larrabee Strow; Moustafa T. Chahine; M. L. McCourt; Juying Warner; Paul C. Novelli; S. Korontzi; Eric Maddy; S. Datta
Received 24 October 2004; revised 19 January 2005; accepted 4 March 2005; published 1 June 2005. [1] We present the first observations of tropospheric carbon monoxide (CO) by the Atmospheric Infrared Sounder (AIRS) onboard NASA’s Aqua satellite. AIRS daily coverage of 70% of the planet represents a significant evolutionary advance in satellite trace gas remote sensing. Tropospheric CO abundances are retrieved from AIRS 4.55 mm spectral region using the full AIRS retrieval algorithm run in a research mode. The presented AIRS daily global CO maps from 22– 29 September 2002 show large-scale, long-range transport of CO from anthropogenic and natural sources, most notably from biomass burning. The sequence of daily maps reveal CO advection from Brazil to the South Atlantic in qualitative agreement with previous observations. Forward trajectory analysis confirms this scenario and indicates much longer range transport into the southern Indian Ocean. Preliminary comparisons to in situ aircraft profiles indicate AIRS CO retrievals are approaching the 15% accuracy target set by pre-launch simulations. Citation: McMillan, W. W., C. Barnet, L. Strow, M. T. Chahine, M. L. McCourt, J. X. Warner, P. C. Novelli, S. Korontzi, E. S. Maddy, and S. Datta (2005), Daily global maps of carbon monoxide from NASA’s Atmospheric Infrared Sounder, Geophys. Res. Lett., 32, L11801, doi:10.1029/ 2004GL021821.
Journal of Geophysical Research | 2007
Juying Warner; M. M. Comer; Christopher D. Barnet; William Wallace McMillan; Walter Wolf; Eric Maddy; G. W. Sachse
Received 16 August 2006; revised 17 November 2006; accepted 28 February 2007; published 9 June 2007. [1] Satellite CO measurements from Measurements of Pollution in the Troposphere (MOPITT) and Atmospheric Infrared Sounder (AIRS) were used in the Intercontinental Chemical Transport Experiment–North America (INTEX-A) by the flight planning team to monitor local emissions and the transport of polluted air masses. Because simultaneous measurements of tropospheric CO from both AIRS and MOPITT were used by different investigators during this experiment, a cross reference and comparison are necessary to understand these two data sets and their impacts to the scientific conclusions developed from them. The global CO mixing ratios at 500 mbar, as well as the CO total column amount, are compared between the two instruments for both direct comparison and the comparison using the same a priori profile for the period from 15 June to 14 August 2004. Also presented are the comparisons of the remotely sensed profiles by AIRS, MOPITT, and the in situ profiles collected by the DACOM. In summary, both sensors agree very well on the horizontal distributions of CO represented by the high correlation coefficients (0.7–0.98), and they agree on the CO concentrations to within an average of 10–15 ppbv. Over land, the CO variability is higher, and the correlations between the two data sets are relatively lower than over ocean; however, there is no evidence of a systematic bias. Over the oceans where the CO concentration is smaller in the lower atmosphere, AIRS-MOPITT show a positive bias of 15–20 ppbv and the details are presented.
Atmospheric Chemistry and Physics | 2009
Monika Kopacz; Daniel J. Jacob; John Fisher; Jennifer A. Logan; Lin Zhang; Inna A. Megretskaia; Robert M. Yantosca; Kumaresh Singh; Daven K. Henze; J. P. Burrows; Michael Buchwitz; Iryna Khlystova; William Wallace McMillan; John C. Gille; David P. Edwards; Annmarie Eldering; V. Thouret; Philippe Nedelec
Atmospheric Chemistry and Physics | 2009
Jenny A. Fisher; Daniel J. Jacob; M. T. Purdy; Monika Kopacz; P Le Sager; C. Carouge; Christopher D. Holmes; Robert M. Yantosca; R. L. Batchelor; Kimberly Strong; Glenn S. Diskin; Henry E. Fuelberg; John S. Holloway; Edward J. Hyer; William Wallace McMillan; J. Warner; David G. Streets; Qiang Zhang; Yuxuan Wang; Shiliang Wu
Atmospheric Chemistry and Physics | 2009
Leonid Yurganov; William Wallace McMillan; E. I. Grechko; A. V. Dzhola
Journal of Geophysical Research | 2008
William Wallace McMillan; Juying Warner; M. M. Comer; Eric Maddy; Allen Chu; L. C. Sparling; Edwin W. Eloranta; Raymond M. Hoff; G. W. Sachse; Christopher D. Barnet; I. Razenkov; Walter Wolf
Atmospheric Measurement Techniques | 2010
L. Yurganov; William Wallace McMillan; C. Wilson; Marc L. Fischer; Sebastien Biraud; Colm Sweeney
Archive | 2008
William Wallace McMillan; Kristen Evans; Leonid Yurganov; Colin Wilson; Glen W. Sachse; Glenn S. Diskin; Christopher D. Barnet; Eric Maddy
Archive | 2008
William Wallace McMillan; D. W. Kollonige; Leonid Yurganov; Arlin J. Krueger; Raymond M. Hoff; Christopher D. Barnet; James F. Gleason; Edward Celarier; Nickolay A. Krotkov; Xiaole Shirley Liu; Thomas P. Kurosu; Gregory Ben Osterman; Omar Torres
Archive | 2007
Kristen Evans; William Wallace McMillan; Glen W. Sachse; Glenn S. Diskin; C. Barnett