@Article{acpd-9-12597-2009,
AUTHOR = {Kr\"uger, K. and Tegtmeier, S. and Rex, M.},
TITLE = {Variability of residence time in the Tropical Tropopause Layer during Northern Hemisphere winter},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {9},
YEAR = {2009},
NUMBER = {3},
PAGES = {12597--12614},
URL = {http://www.atmos-chem-phys-discuss.net/9/12597/2009/},
DOI = {10.5194/acpd-9-12597-2009}
}