8 February 2001 Comparison accuracy of atmospheric nitrogen dioxide profile retrieval from measured transmission function by two several tape spectrometers
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Abstract
In the work the comparison accuracy of atmospheric NO2 density profile retrieval from measured transmission function by two several tape space spectrometers had be done. Suppose that solar radiation enters in these spectrometers through the some optical telescopic system and the mistakes of receiving system are out of the consideration. The first spectrometer is ordinary instrument with diffraction grating. This spectrometer2 measure atmospheric transmission function for several tangent altitude in 430-450 nm spectral region with resolution 1 nm by limb method using the sun as source of the radiation. The accuracy and resolution of these measurements are high enough but there is complex problem selecting the absorption of NO2 gas from another gases absorption and the retrieval of NO2 profile from transmission function. In the second spectrometer4 is used a tunable interference - polarization filter, so called Woods filter. The basic element of the Woods filter is a plate made of a double-refraction crystal placed between two mutually perpendicular polarizes. Transmission function of this filter must be coincided with the quasi-periodical vibration spectrum of an NO2 molecule for a 430-450 nm range and must pick out NO2 absorption from another gas absorption. Errors of the measurement by this spectrometer installed on satellite are compiled from fluctuation background noise, internal noise of instrument, changing slop spectrum of coming radiation and another. The comparison of mentioned above measuring instruments and methods showed that the accuracy of NO2 profile retrieval is equal into 15-35 km altitude region for both spectrometers. However the using of correlative spectrometer increase the region of available measurement to 1 0 km above and to 10 km low indicated region.
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Eleonora A. Chayanova, "Comparison accuracy of atmospheric nitrogen dioxide profile retrieval from measured transmission function by two several tape spectrometers", Proc. SPIE 4151, Hyperspectral Remote Sensing of the Land and Atmosphere, (8 February 2001); doi: 10.1117/12.417000; https://doi.org/10.1117/12.417000
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KEYWORDS
NOx

Spectrometers

Absorption

Optical filters

Aerosols

Solar radiation

Atmospheric optics

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