Chris Walcek

Air Pollution meteorology. Radiative, dynamic, and chemical effects of clouds. The influence of shear in the planetary boundary layer on pollution dispersion. Air quality modeling

The World Within Reach
Chris J. Walcek
Senior Research Associate


251 Fuller Road, Albany
New York 12203

518-437-8758 (fax)



Ph. D. from UCLA in Atmospheric Sciences, 1983

Research Interests

Air pollution meteorology, dispersion of pollutants, and atmospheric chemistry. Interactions between larger-scale meteorology, clouds, and chemistry of atmospheric pollutants. Acid rain, ozone formation, heterogeneous chemistry, numerical methods in air quality modeling, Mercury pollution, and impacts associated with aircraft pollution. Quantifying the influence of clouds on atmospheric chemistry, short-term meteorology, and climate using available cloud observations in conjunction with numerical models of cloud processes.

Also investigating shear and the influence of shear on the lateral dispersion of pollutants emitted from point sources in the planetary boundary layer. Recent investigations of aircraft-induced cloud seeding investigating hypothesis that aircraft downdraft-induced evaporation factors contaminate and overwhelm potential ice-nucleating effects.


Walcek, C. J., (2012) The effects of wind shear on pollution plumes. J. Geophys Research, Under revisions following initial review

Walcek, C. J., (2011) The effects of wind shear on pollution plumes. Atmospheric Environment, in preparation

Walcek, C. J., (2008) Wind shear in the Hudson River Valley of New York. Monthly Weather Review, in preparation

Potter, Thomas D., and Colman Bradley R., (2003) Editors of “Handbook of Weather, Climate and Water. Atmospheric Chemistry, Hydrology and Societal Impacts”. Chapter 19 authored by C. J. Walcek “Fate of atmospheric Trace Gases: Wet Deposition” p357-372. Wiley Interscience, Published John Wiley & Sons Inc., Hoboken, NJ. ISBN 0-471-21489-2, 966 pp.

Walcek, C. J., (2004) Diurnal variations in boundary-layer wind shear. Bulletin of the American Meteorological Society, 85, 1257-1258 (Sep 2004).

Kreidenweis, S. M.,Walcek, C. J., Feingold, G., Gong, W., Jacobson, M. Z., Kim, C-H., Liu, X., Penner, J. E., Nenes, N. and Seinfeld, J. H. (2003) Modification of aerosol mass and size distribution due to aqueous-phase SO2 oxidation in clouds: Comparisons of several models. Journal of Geophysical Research, 108, 4213, doi:1029/2002JD002697.

Walcek, C. J., De Santis S. and Gentile T. (2002) Preparation of mercury emissions inventory for eastern North America. Environmental Pollution, 123, 375-381.

Walcek, C. J. (2002) Effects of wind shear on pollutant dispersion. Atmospheric Environment, 36, 511-517.

Tsai, F. and Walcek, C. J. (2001) Estimating chemical errors in large-scale simulations of aircraft emissions. Terrestrial, Atmospheric and Ocean Sciences, 12, 79-108.

Walcek, C. J. (2000) Minor flux Adjustment near mixing ratio extremes for simplified yet highly accurate monotonic calculation of tracer advection. Journal of Geophysical Research, 105, 9335-9348.

Rasch P. J., Feichter J., Law K., Mahowald N., Penner J., Benkovitz C., Genthon C., Giannakopoulos C., Kasibhatla P., Levy H., Maki t., Prather M., Roberts D. L., Roelofs G.-J., Stevenson D., Stockwell Z., Taguchi S., Kritz M., Chipperfield M., Baldocchi D., McMurray P., Barrie L., Balkanski Y., Chatfield R., Kjellstrom E., Lawrence M., Lee H. N., Lelieveld J., Noone K. J., Seinfeld J., Stenchikov G., Schwartz S., C. J. Walcek and Williamson D. (2000) A comparison of scavenging and deposition processes in global models: results from the WCRP Cambridge Workshop of 1995. Tellus, 52b, 1025-1056.

Husain, L., O. V. Rattigan, V. Dutkiewicz, M. Das, C. D. Judd, A. R. Khan, R. Richter, R. Balasubramanian, K. Swami and C. J. Walcek (2000) Case studies of the SO2 + H2O2 reaction in clouds. Journal of Geophysical Research, 105, 9831-9841.

Walcek, C. J. (1999) A highly accurate numerical advection algorithm Section in textbook: Air Pollution VII, p 761-769, WIT Press, Southampton, England

Walcek C. J. and N. M. Aleksic 1998: A simple but accurate mass conservative, peak-preserving, mixing ratio bounded advection algorithm with FORTRAN code. Atmos. Environ., 32, 3863-3880.

Walcek C. J., H. H. Yuan and W. R. Stockwell 1997: The influence of in-cloud chemical reactions on ozone formation in polluted and nonpolluted areas. Atmos. Environ., 31, 1221-1237.

Walcek C. J. 1995: Calculated influence of temperature-related factors on ozone formation rates in the lower troposphere. J. Applied Met., 34, 1056-1069.

Walcek C. J. 1994: Cloud cover and its relationship to relative humidity during a springtime midlatitude cyclone. Mon. Wea. Rev., 122, 1021-1035.

Walcek C. J., and E. Brankov, 1994: The influence of entrainment-induced variability of cloud microphysics on the chemical composition of cloud water. Atmos. Res., 32, 215-232.

Walcek C. J., W. R. Stockwell and J. S. Chang, 1990: Theoretical estimates of the dynamic, radiative and chemical effects of clouds on tropospheric trace gases. Atmos. Res., 25, 53-69.

J. S. Chang, R. A. Brost, I. S. A. Isaksen, S. Madronich, P. Middleton, W. R. Stockwell and C. J. Walcek, 1987: A three-dimensional Eulerian acid deposition model: physical concepts and model formulation. J. Geophys. Res., 92, p. 14682-14700.

Walcek C. J., 1987: A theoretical estimate of O3 and H2O2 dry deposition over the NE United States.Atmos. Environ., 21, p 2649-2659.

Walcek C. J. and J. S. Chang, 1987: A theoretical assessment of pollutant deposition to individual land types during a regional-scale acid deposition episode. Atmos. Environ., 21, p. 1107-1113.

Walcek C. J. and G. R. Taylor, 1986: A theoretical method for computing vertical distributions of acidity and sulfate production within cumulus clouds. J. Atmos Sci., 43, p. 339-355.

Walcek C. J., R. A. Brost, J. S. Chang and M. L. Wesely, 1986: SO2 sulfate and HNO3 deposition velocities computed using regional land use and meteorological data. Atmos. Environ., 20, p. 949-964.

Rasmussen R., C. J. Walcek, H. R. Pruppacher, S. K. Mitra, J. Lew, V. Levizzani, P. K. Wang and U. Barth, 1985: A wind tunnel investigation of the effect of an external vertical electric field on the shape of electrically uncharged raindrops. J. Atmos Sci., 42, p.1647-1562.

Walcek C. J. and H. R. Pruppacher, 1984: On the scavenging of SO2 by cloud and raindrops I: A theoretical study of SO2 absorption and desorption for water drops in air. J. Atmos. Chem., 1, p. 269-289.

Walcek C. J. and H. R. Pruppacher, J. H. Topalian and S. K. Mitra, 1984: On the scavenging of SO2 by cloud and raindrops II: An experimental study of SO2 absorption and desorption for water drops in air. J. Atmos. Chem., 1, 291-306.

Walcek C. J. and H. R. Pruppacher, 1984: On the scavenging of SO2 by cloud and raindrops III: A theoretical study of SO2 washout by rain falling through a pollution plume. J. Atmos. Chem., 1, p. 307-324.

Walcek C. J., P. K. Wang, J. H. Topalian, S. K. Mitra, and H. R. Pruppacher, 1981: An experimental test of a theoretical model to determine the rate at which freely falling water drops scavenge SO2 in air. J. Atmos Sci., 38, p. 871-876.

Ryan, J. A., R. M. Henry, S. L. Hess, C. B. Leovy, J. E. Tillman and C. J. Walcek, 1978: Mars meteorology: three seasons at the surface. Geophys. Res. Let., 5, p. 715-718.