Other
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.562e..27w&link_type=abstract
Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), 3-7 May 2004, ESA-ESRIN, Frascat
Other
Scientific paper
The water vapour operational data products from MIPAS (V4.61) have been validated by comparison with independent satellite measurements from HALOE (Version 19), SAGE II (Version 6.2), and POAM III (V2). Availability of MIPAS data were limited to the validation reference data set from July 2002 to December 2002. Between 100 hPa and 10 hPa (15-30 km) good agreement between MIPAS and the three satellite instruments to within the combined error of 15 (POAM III) to 25(HALOE) has been found. Above 30 km (below 10 hPa) a positive bias of up to 20% with respect to the other satellites has been observed. In the lowermost stratosphere root-mean-squared scatter of the observed differences increases dramatically (above 100 hPa with HALOE and POAM, and above 50 hPa with SAGE II). three space borne solar occultation instruments SAGE II, HALOE, and POAM III. The Halogen Occultation Experiment (HALOE) is operating since 1992 aboard the Upper Atmosphere Research satellite (UARS) and operates in the infrared between 2.45 and 10.0 µm [5]. The Stratospheric Aerosol and Gas Experiment II (SAGE II) measures since 1984 onboard ERBS and its radiometer records seven discrete UV-VIS-NIR wavelengths between 0.385 and 1.02 µm (e.g. [6]). POAM III has nine spectral windows spread from 353 nm to 1018 nm and has a similar spectral coverage than SAGE II [7,8,9]. POAM III observations are limited to polar regions near 65°N and between 60°S and 80°S, while SAGE II and HALOE also cover tropical regions. Other satellite instruments that have been recently launched have not yet been compared to ENVISAT. They are SMR/ODIN an SAGE III/METEOR-3 (both launched in 2001) and SABER/TIMED (launched in 2002). Additional water vapour profile measurements from space are to be expected from several instruments aboard AURA, i.e. MLS, TES, and HRDLS, to be launched this year. All three atmospheric chemistry experiments aboard ENVISAT (SCIAMACHY, GOMOS, and MIPAS) measure water vapour, but intercomparison results are not presented. The complete MIPAS data sets from the validation reference set (data from 2002/07/182002/12/27) have been searched for coincident satellite measurements. The coincidence criterion was a distance of less than 250 km between tangent points of HALOE/SAGE II and MIPAS and that collocated measurements were from the same day. Similar criteria applied to collocated POAM III measurements except that the maximum allowable tangent point distance was 600 km. During the time period of the validation reference data set altitude errors up to 3 km due to an ENVISAT pointing problem have been observed. For this reason the comparison with SAGE and HALOE was done on pressure levels that could be directly retrieved from CO2 MIPAS measurements. For validation the following data version were used: Version 19 of HALOE, Version 6.2 of SAGE II [10], and Version 2 from POAM III [8,11].
Bazureau A.
Bracher Annina
Bramstedt K.
Goutail Florence
Weber Matthias
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