Park, S., E. Atlas, R. Jiménez, B. Daube, E. Gottlieb, J. Nan, D. B. A. Jones, L. Pfister, T. J. Conway, T. P. Bui, R. Gao, and S. C. Wofsy (2010), Vertical transport rates and concentrations of OH and Cl radicals in the Tropical Tropopause Layer from observations of CO2 and halocarbons: implications for distributions of long- and short-lived chemical species, Atmos. Chem. Phys., 10, 6669-6684, doi:10.5194/acp-10-6669-2010.