Measurements of stratospheric NO2 profiles using a gas correlation radiometer in the solar occultation mode |
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| Authors: | H Fischer E Redemann F Fergg D Rabus |
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| Institution: | (1) Meteorological Institute Munich, Theresienstr. 37, 8 Munich 2, West Germany;(2) Present address: Institute of Social Pediatrics, University of Munich, Germany |
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| Abstract: | Compact two-channel IR radiometers for solar occultation experiments have been constructed in order to measure concentration profiles of stratospheric trace gases. The instruments can be used as filter-or gas correlation-type radiometers depending on the trace gas under investigation. Within the LIMS correlative measurement program, balloon flights were performed with a payload of up to four of these two-channel radiometers. From the gas correlation-type measurements, profiles of the trace gas NO2 are inferred for the altitude region between about 20 km and the balloon float level. The data evaluation also includes a comprehensive analysis of the error sources and their effect on the accuracy of the NO2 profiles. The derived profiles are compared among themselves and are assessed against the observations of other authors by accounting for the diurnal, latitudinal and seasonal changes of NO2. As a by-product of our measurements, the mean absorption of the O2 collision-induced band at 6.4  m was determined within the range of the interference filter used and compared with calculations based on known absorption coefficients. |
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| Keywords: | NO2 stratospheric IR measurements vertical profiles gas correlation radiometer remote sensing |
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