Classification of Northern Hemisphere stratospheric ozone and water vapor profiles by meteorological regime M. B. Follette-Cook1,*, R. D. Hudson2, and G. E. Nedoluha1 1Naval Research Lab, Remote Sensing Division, Washington, D.C., 20375, USA 2Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, USA *currently at: Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, MD 20771, USA
Abstract. The subtropical and polar upper troposphere fronts and the polar vortex
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. 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 20 km. This distinction was most pronounced
in the winter and spring months, and weak 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 ~22 km.
Given that profiles of ozone and water vapor exhibit unique profiles shapes
within each regime in the UTLS, trends in this region will therefore be the
result of both changes within each meteorological regime, and changes in the
relative contribution of each regime to a given zonal band over time.
Citation: Follette-Cook, M. B., Hudson, R. D., and Nedoluha, G. E.: Classification of Northern Hemisphere stratospheric ozone and water vapor profiles by meteorological regime, Atmos. Chem. Phys., 9, 5989-6003, doi:10.5194/acp-9-5989-2009, 2009.