Bias determination and precision validation of ozone profiles from MIPAS-Envisat retrieved with the IMK-IAA processorReport as inadecuate

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1 IMK - Institute for Meteorology and Climate Research 2 IAA - Instituto de Astrofísica de Andalucía 3 Physics Department UNB 4 KNMI - Royal Netherlands Meteorological Institute 5 Department of Bentho-pelagic processes 6 NILU - Norwegian Institute for Air Research 7 FMI-Arctic Research Centre 8 IRF - Swedish Institute of Space Physics 9 Instituto Nacional de Meteorologia INM 10 Atmospheric Sciences Competency 11 Department of Physics 12 DWD - Deutscher Wetterdienst Offenbach 13 INTA - Instituto Nacional de Técnica Aeroespacial

Abstract : This paper characterizes vertical ozone profiles retrieved with the IMK-IAA Institute for Meteorology and Climate Research, Karlsruhe ? Instituto de Astrofisica de Andalucia science-oriented processor from spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding MIPAS aboard the environmental satellite Envisat. Bias determination and precision validation is performed on the basis of correlative measurements by ground-based lidars, Fourier transform infrared spectrometers, and microwave radiometers as well as balloon-borne ozonesondes, the balloon-borne version of MIPAS, and two satellite instruments Halogen Occultation Experiment and Polar Ozone and Aerosol Measurement III. Percentage mean differences between MIPAS and the comparison instruments for stratospheric ozone are within ±10%. The precision in this altitude region is estimated at values between 5 and 10% which gives an accuracy of 15 to 20%. Below 18 km, the spread of the percentage mean differences is larger and the precision increases to values of more than 20% depending on altitude and latitude. The main reason for the degraded precision at low altitudes is attributed to undetected thin clouds which affect MIPAS retrievals, and to the influence of uncertainties in the water vapor concentration.

Author: T. Steck - T. Von Clarmann - H. Fischer - B. Funke - N. Glatthor - U. Grabowski - M. Höpfner - S. Kellmann - M. Kiefer - A. Lind



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