EOS Microwave Limb Sounder observations of the Antarctic polar vortex breakup in 2004

Details EOS Microwave Limb Sounder observations of the Antarctic polar vortex breakup in 2004 EOS Microwave Limb Sounder observations of the Antarctic polar vortex breakup in 2004

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212811m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 12, CiteID L12811

Computer Science

Sound

13

Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Polar Meteorology, Atmospheric Processes: Remote Sensing

Scientific paper

New observations from the Microwave Limb Sounder (MLS) on NASA's Aura satellite give a detailed picture of the spring Antarctic polar vortex breakup throughout the stratosphere, with the first daily global HCl profiles providing an unprecedentedly clear view of transport in the lower stratosphere. Poleward transport at progressively lower levels, filamentation, and mixing are detailed in MLS HCl, N2O, H2O, and O3 as the 2004 Antarctic vortex broke up from the top down in early October through late December. Improved MLS H2O data show the subvortex, below the tropical tropopause, breaking up almost simultaneously with the lower stratospheric vortex in December. Vortex remnants persisted in MLS tracers for over a month after the breakup in the midstratosphere, but no more than a week in the lower stratosphere. MLS observations show diabatic descent continuing throughout November, but weak ascent after late October in the lower stratospheric vortex core. Our results extend previous observational transport studies and show consistency with mixing and vortex evolution in meteorological analyses, and with model studies.

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