HR: 0800h
AN: A41A-0029 [Abstracts]
TI: Discovery of a ``Frozen-in" Anticyclone in the Spring and Summer Arctic Stratosphere in EOS MLS
Data
AU: Manney, G L
EM: manney@mls.jpl.nasa.gov
AF: Jet Propulsion Laboratory, M/S 183-701
4800 Oak Grove Dr, Pasadena, CA 91109
United States
AU: Manney, G L
EM: manney@mls.jpl.nasa.gov
AF: New Mexico Institute of Mining and Technology, Department of Physics, Socorro, NM 87801
United States
AU: * Livesey, N J
A41A-0029
AF: Jet Propulsion Laboratory, M/S 183-701
4800 Oak Grove Dr, Pasadena, CA 91109
United States
AU: Pumphrey, H C
A41A-0029
AF: University of Edinburgh, Department of Meteorology, Edinburgh, EH9 3JZ
United Kingdom
AU: Jimenez, C J
A41A-0029
AF: University of Edinburgh, Department of Meteorology, Edinburgh, EH9 3JZ
United Kingdom
AU: Froidevaux, L
A41A-0029
AF: Jet Propulsion Laboratory, M/S 183-701
4800 Oak Grove Dr, Pasadena, CA 91109
United States
AU: MacKenzie, I
A41A-0029
AF: University of Edinburgh, Department of Meteorology, Edinburgh, EH9 3JZ
United Kingdom
AU: Santee, M L
A41A-0029
AF: Jet Propulsion Laboratory, M/S 183-701
4800 Oak Grove Dr, Pasadena, CA 91109
United States
AU: Waters, J W
A41A-0029
AF: Jet Propulsion Laboratory, M/S 183-701
4800 Oak Grove Dr, Pasadena, CA 91109
United States
AB:
The 2004-2005 Arctic winter polar vortex broke up in a major
final warming. EOS MLS measurements of the long-lived tracers
N2O and H2O reveal an anticyclone that forms near the pole
during the final warming, and persists after the final warming,
through most of the Boreal summer. The phenomenon is analogous
to previously reported ``frozen-in" vortex remnants, but
even more persistent. Potential vorticity (PV) fields show a
similar, but shorter-lived feature. We detail the 3-dimensional
structure and evolution of the ``frozen-in anticyclone" (FrIAC)
in MLS N2O and H2O observations, and show the more rapid
dissipation of its signature in ozone under the influence of
chemical effects. PV fields are used to explore the possibility
and frequency of previous occurrences of the FrIAC phenomenon.
MLS observations are compared with simulations from the SLIMCAT
chemical transport model and with trajectory calculations to
examine our ability to model the FrIAC.
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005