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Long-term validation of ESA operational retrieval (version 6.0) of MIPAS
Envisat vertical profiles of methane, nitrous oxide, CFC11, and CFC12 using
balloon-borne observations and trajectory matching
Abstract. MIPAS-Envisat is a satellite-borne sensor which measured vertical
profiles of a wide range of trace gases from 2002 to 2012 using IR emission
spectroscopy. We present geophysical validation of the MIPAS-Envisat
operational retrieval (version 6.0) of N2O, CH4, CFC-12, and CFC-11 by the
European Space Agency (ESA). The geophysical validation data are derived from
measurements of samples collected by a cryogenic whole air sampler flown to
altitudes of up to 34 km by means of large scientific balloons. In order to
increase the number of coincidences between the satellite and the balloon
observations, we applied a trajectory matching technique. The results are
presented for different time periods due to a change in the spectroscopic
resolution of MIPAS in early 2005. Retrieval results for N2O, CH4, and CFC-12
show partly good agreement for some altitude regions, which differs for the
periods with different spectroscopic resolution. The more recent low
spectroscopic resolution data above 20 km altitude show agreement with the
combined uncertainties, while there is a tendency of the earlier high spectral
resolution data set to underestimate these species above 25 km. The earlier
high spectral resolution data show a significant overestimation of the mixing
ratios for N2O, CH4, and CFC-12 below 20 km. These differences need to be
considered when using these data. The CFC-11 results from the operation
retrieval version 6.0 cannot be recommended for scientific studies due to a
systematic overestimation of the CFC-11 mixing ratios at all altitudes
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