HR: 1340h
AN: A43A-0068    [Abstracts]
TI: Comparisons of Wintertime, Vortex, Polar Stratospheric Temperatures as Measured by CHAMP Radio Occultations With ECMWF, NCEP Reanalysis and MetOffice Analyses
AU: * Alfred, J M
EM: alfred@cpi.com
AF: Computational Physics Inc, 8001 Braddock Road, Springfield, va 22151 United States
AU: Nedoluha, G
A43A-0068 AF: Naval Research Lab, 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: Wickert, J
A43A-0068 AF: Geoforschungszentrum, Telegrafenberg, D-14473, Potsdam, 14473 Germany
AB: Comparisons of winter, stratospheric temperatures are conducted using three operational weather assimilation models (European Centre for Medium-Range Weather Forecasts (ECMWF), United Kingdom Meteorological Office (MetOffice) and National Center for Environmental Prediction Reanalysis (NCEP)) and Challenging Minisatellite Payload (CHAMP) radio occultation measurements. Comparisons are used to quantify the effect of known changes in the models, and determine any inter-annual variability, and biases of the models. Comparisons are restricted to within the Nash polar vortex edge in both hemispheres, where important temperature dependant processes (ie. PSC formation and ozone depletion) occur, and validations are rare and sparsely distributed. The CHAMP RO data also are well suited for comparing with the model data, as they are not assimilated into the models. Four seasons are compared in the Northern Hemisphere (2001/2 - 2004/5), and three in the Southern Hemisphere (2002 - 2004). Model data are interpolated in space and time to the CHAMP measurement locations, and both the model and CHAMP data are interpolated to a common pressure grid ranging from 100 to 10 hPa to conduct the comparisons. Comparisons are shown as a function of latitude and temperature.
DE: 0350 Pressure, density, and temperature
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005