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Halogen species are extremely important in atmospheric chemistry, serving both as strong oxidants and as catalysts that drive the production and destruction of ozone. Recent field investigations have demonstrated that nitrogen oxides, common pollutants from combustion sources, are efficient at producing these halogens, particularly in the winter and during darkness. Little is known about this potentially important process.  , based at the Boulder Atmospheric Observatory in Weld County, Colorado, provided vertically resolved measurements from a 300 m tower during winter. It will included measurements of the key halogen, nitrogen oxide, and aerosol species that define this atmospheric chemical cycle.

Selected Papers

Wagner, N.L., T.P. Riedel, C.J. Young, R. Bahreini, C.A. Brock, W.P. Dubé, S. Kim, A.M. Middlebrook, F. Öztürk, J.M. Roberts, R. Russo, B. Sive, R. Swarthout, J.A. Thornton, T.C. VandenBoer, Y. Zhou, and S.S. Brown, N₂O₅ uptake coefficients and nocturnal NO₂ removal rates determined from ambient wintertime measurements. J. Geophys. Res., 2013. 118(16): p. 9331-9350. 

Riedel, T.P., N.L. Wagner, W.P. Dubé, A.M. Middlebrook, C.J. Young, F. Öztürk, R. Bahreini, T.C. VandenBoer, D.E. Wolfe, E.J. Williams, J.M. Roberts, S.S. Brown, and J.A. Thornton, Chlorine activation within urban and power plant plumes: vertically resolved ClNO₂ and Cl₂ measurements from a tall tower in a polluted continental setting. J. Geophys. Res., 2013. 118(15): p. 8702-8715. 

Brown, S.S., J.A. Thornton, W.C. Keene, A.A.P. Pszenny, B.C. Sive, W.P. Dubé, N.L. Wagner, C.J. Young, T.P. Riedel, J.M. Roberts, T.C. VandenBoer, R. Bahreini, F. Öztürk, A.M. Middlebrook, S. Kim, G. Hübler, and D.E. Wolfe, Nitrogen, Aerosol Composition and Halogens on a Tall Tower (NACHTT): Overview of a Wintertime Air Chemistry Field Study in the Front Range Urban Corridor of Colorado. J. Geophys. Res., 2013. 118: p. 8067-8085.