Mid-winter lower stratosphere temperatures in the Antarctic vortex: comparison between observations and ECMWF and NCEP operational models M. C. Parrondo1, M. Yela1, M. Gil1, P. von der Gathen2, and H. Ochoa3 1Instituto Nacional de Técnica Aeroespacial, Torrejón de Ardoz, Spain 2Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Germany 3Dirección Nacional de Antártico, Buenos Aires, Argentina
Abstract. Radiosonde temperature profiles from Belgrano (78° S) and other
Antarctic stations have been compared with European Centre for Medium-Range
Weather Forecasting (ECMWF) and National Centers for Environmental
Prediction (NCEP) operational analyses during the winter of 2003. Results
show good agreement between radiosondes and NCEP and a bias in the ECMWF
model which is height and temperature dependent, being up to 3°C too
cold at 80 and 25–30 hPa, and hence resulting in an overestimation of the
predicted potential PSC areas. Here we show the results of the comparison
and discuss the potential implications that this bias might have on the
ozone depletion computed by Chemical Transport Models based on ECMWF
temperature fields, after rejecting the possibility of a bias in the sondes
at extreme low temperatures.
Citation: Parrondo, M. C., Yela, M., Gil, M., von der Gathen, P., and Ochoa, H.: Mid-winter lower stratosphere temperatures in the Antarctic vortex: comparison between observations and ECMWF and NCEP operational models, Atmos. Chem. Phys., 7, 435-441, doi:10.5194/acp-7-435-2007, 2007.