Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-13375-2008 http://www.atmos-chem-phys-discuss.net/8/13375/2008/ http://www.atmos-chem-phys-discuss.net/8/13375/2008/acpd-8-13375-2008.html http://www.atmos-chem-phys-discuss.net/8/13375/2008/acpd-8-13375-2008.pdf 13375 13411 2008-07-15 Classification of Northern Hemisphere stratospheric ozone and water vapor profiles by meteorological regime M. B. Follette melanie.follette@nrl.navy.mil R. D. Hudson G. E. Nedoluha Naval Research Lab, Remote Sensing Division, Washington, DC, 20375, USA Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, USA The subtropical and polar upper troposphere fronts serve as the boundaries to divide the Northern Hemisphere into four meteorological regimes. These regimes are defined as (1) the arctic regime – within the polar vortex, (2) the polar regime – between the polar front and the polar vortex, or when the latter is not present, the pole, (3) the midlatitude regime – between the subtropical and polar fronts, and (4) the tropical regime – between the equator and the subtropical front. Data from the Halogen Occultation Experiment (HALOE) and the Stratospheric Aerosol and Gas Experiment II (SAGE II) were used to show that within each meteorological regime, ozone and water profiles are characterized by unique ozonepause and hygropause heights. In addition, both constituents exhibited distinct profile shapes up to approximately 25 km. This distinction was most pronounced in the winter and spring months, and less in the summer and fall. Both daily measurements and seven-year (1997–2003) monthly climatologies were analyzed. <br> <br> Daily measurements and seven-year (1997–2003) monthly climatologies showed that, within each meteorological regime, both constituents exhibited distinct profile shapes from the tropopause up to approximately 25 km. This distinction was most pronounced in the winter and spring months, and less in the summer and fall. Despite differences in retrieval techniques and sampling between the SAGE and HALOE instruments, the seven-year monthly climatologies calculated for each regime agreed well for both species below ~25 km. 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