Validation of Mipas Temperature Data with the U. Bonn Lidar at the Esrange During July and August 2002

Details Validation of Mipas Temperature Data with the U. Bonn Lidar at the Esrange During July and August 2002 Validation of Mipas Temperature Data with the U. Bonn Lidar at the Esrange During July and August 2002

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.562e..42b&link_type=abstract

Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), 3-7 May 2004, ESA-ESRIN, Frascat

Computer Science

Scientific paper

The Bonn University lidar is located at the Esrange (68 N, 21 E) in northern Sweden, near the city of Kiruna. During July/August 2002 a measurement campaign for the validation of Mipas, Gomos, and Sciamachy data was performed. During 41 measurement runs a total of nearly 350 hours integration time was accumulated. Most of the measurements could be used for the calculation of temperature profiles in the aerosol-free part of the atmosphere, which is above 30 km altitude. For the period July/August 2002 we received 56 Mipas files containing temperature data, processed with the software MIPAS/4.61 for the Esrange location. The range of values encountered in these files are: tangent point distances from the lidar range from 60 km to 995 km, altitudes range from 7 km to 70 km, temperatures range from 207 K to 283 K, and temperature errors range from 0.3 K to 2.7 K. These data ranges look quite reasonable and self-consistent. Out of these 56 Mipas temperature profiles we could use 33 profiles for validation. Selection criteria were the simultaneous spatial and temporal coincidence of the Mipas and lidar measurements. The time window was met, when the lidar measurements started or ended within one hour about the Mipas measurement time. We used two space windows. The first window comprised all data within 500 km of the Esrange (in total 11 profiles) and the second window consisted of all profiles within 1000 km of the Esrange (in total 33 data-sets). We interpolated the lidar data to each Mipas corrected altitude. The comparison of all available Mipas-Lidar temperature pairs in the altitude range 30 to 70 km showed mean values (a measure for the accuracy) for the temperature difference of 0.3 % ( 0.7 K) and 0.7 % ( 1.6 K) in the 500 km and 1000 km tangent point range windows, respectively. A t-test revealed that these differences cannot be attributed to chance, but must be real. The standard deviations of the distributions (a measure for the precision) are of the order of 2 % ( 5 K) for both range groups. While the Mipas temperatures do not agree on average with the lidar temperatures for the available data-set, the deviation is very small and fits well with the targeted accuracy for the Mipas temperature data.

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