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First infrared measurement of atmospheric NO 2 from the ground
Author(s) -
CamyPeyret C.,
Flaud J.M.,
Laurent J.,
Stokes G. M.
Publication year - 1983
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl010i001p00035
Subject(s) - sunrise , sunset , spectral line , atmosphere (unit) , infrared , absorption (acoustics) , absorption spectroscopy , ground state , physics , spectral resolution , analytical chemistry (journal) , geology , optics , materials science , atomic physics , chemistry , meteorology , astronomy , chromatography
High resolution Fourier transform spectra of the atmosphere in the 2850 ‐ 2950 cm −1 region have been recorded from the ground using the sun as a source. For the first time, many NO 2 absorption peaks belonging to the ν 1 + ν 3 band and its associated hot band ν 1 + ν 2 + ν 3 − ν 2 have been located. Among them, 13 well isolated features have been used to determine NO 2 vertical column densities. Indeed, from the analysis of 4 spectra recorded at air masses of 10.7, 5.4, 3.1 and 10.8, that is for the 3 first ones just after sunrise and in the early morning and for the last one just before sunset, vertical column densities of 1.84 ± 0.34, 1.80 ± 0.28, 1.74 ± 0.44 and 3.24 ± 0.46 10 15 molecule.cm −2 have been obtained. The good absolute accuracy of these results is due to the use of several lines having a wide enough range of intensities and of lower state energy levels.