Reprint of: Atmospheric Remote-sensing Reference Data from GOME: Part 1. Temperature-dependent Absorption Cross-sections of NO2 in the 231-794 nm NO2 in the 231-794 nm Range
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 403 KB
- Volume
- 111
- Category
- Article
- ISSN
- 0022-4073
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✦ Synopsis
Absorption cross-sections of NO between 231-794 nm have been measured in the 221-293 K temperature range, using the global ozone monitoring experiment (GOME) flightmodel (FM) satellite spectrometer. The spectra have a resolution of about 0.2 nm below 400 nm and of about 0.3 nm above 400 nm. These are the first reference spectra of NO covering at the same time the entire UV-visible-NIR spectral range and a broad range of relevant atmospheric temperatures. The new absorption cross-sections are important as accurate reference data for atmospheric remote-sensing of NO and other minor trace gases. 1998 Elsevier Science Ltd. All rights reserved.
1. INTROD UCTIO N
NO is amongst the most important trace gases in the Earth's atmosphere. The chemistry of NO is closely linked to the O cycle, and its atmospheric concentrations vary significantly as a function of altitude, latitude, and season. These variations, partially due to man-made gaseous emissions, need to be monitored in order to provide accurate input for political decisions on environmental protection and the preservation of the stratospheric ozone layer.
For these reasons, the global ozone monitoring experiment (GOME) satellite spectrometer was launched in 1995 onboard the ERS-2 satellite. This instrument measures back-scattered solar radiation for the determination of atmospheric column densities of O , NO , and other trace gases on a global scale within three days. For the retrieval procedures, absorption characteristics of these gases in the spectral range 231-794 nm are used.
Before launch, laboratory reference spectra of NO , O , and SO were measured using the GOME FM spectrometer. One important advantage of these spectra is that they cover the entire UV-visible-NIR spectral range and a relevant range of atmospheric temperatures. Furthermore, the GOME FM spectrometer is a well-calibrated instrument, including spectral and radiometric calibration and an accurate determination of its instrumental line shape. Therefore, the new absorption cross-sections measured using the GOME FM spectrometer are essential as reference data for the retrieval of atmospheric NO and other trace gases, not only for GOME but also for medium-resolution zenith sky differential optical absorption spectroscopy (DOAS) observations taken on ground, or from balloon and aircraft platforms.
EXPERIMENTAL