@Article{acp-7-3989-2007,
AUTHOR = {Park, S. and Jiménez, R. and Daube, B. C. and Pfister, L. and Conway, T. J. and Gottlieb, E. W. and Chow, V. Y. and Curran, D. J. and Matross, D. M. and Bright, A. and Atlas, E. L. and Bui, T. P. and Gao, R.-S. and Twohy, C. H. and Wofsy, S. C.},
TITLE = {The CO$_{2}$ tracer clock for the Tropical Tropopause Layer},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {7},
YEAR = {2007},
NUMBER = {14},
PAGES = {3989--4000},
URL = {http://www.atmos-chem-phys.net/7/3989/2007/},
ISSN = {1680-7316}
}