First lidar observations of mesospheric hydroxyl

Autor: E. J. Brinksma, R. P. Cageao, Wim Ubachs, D. P. J. Swart, W. A. Matthews, Wim Hogervorst, Y. J. Meijer, I. S. McDermid, J. B. Bergwerff, J. W. Hovenier
Přispěvatelé: Atoms, Molecules, Lasers, LaserLaB - Physics of Light
Rok vydání: 1998
Předmět:
Zdroj: Brinksma, E J, Meijer, Y J, McDermid, I S, Cageao, R P, Bergwerff, J B, Swart, D P J, Ubachs, W, Matthews, W A, Hogervorst, W & Hovenier, J W 1998, ' First lidar observations of mesospheric hydroxyl ', Geophysical Research Letters, vol. 25, no. 1, pp. 51-54 . https://doi.org/10.1029/97GL53561
Geophysical Research Letters, 25(1), 51-54. American Geophysical Union
ISSN: 0094-8276
DOI: 10.1029/97gl53561
Popis: Ground-based lidars have been used to detect and identify ground-state (v" =0) hydroxyl radicals (OH) in the mesosphere between about 75 and 85 km altitude. These lidars operate near 308 nm and OH is observed through laser-induced-fluorescence on the A 2∑ + -X 2II(0, 0) band. The results expose a valuable global set of nighttime OH observations, since existing long-term lidar data at several NDSC sites contain the (serendipitous) OH information. Results of lidar observations are presented from two mid-latitude sites, one in each hemisphere: Table Mountain (34°N), California, and Lauder (45°S), New Zealand. They show observations of a geometrically thin (∼3 km) nocturnal layer of OH near 80 km. For the Table Mountain observations, the derived values for the OH density at 80 km typically are 2 - 4 × 10 5 cm -3 which is in accordance with model predictions [Dodd et al., 1994]. The temporal behavior of the mesospheric OH signal, following sunset, that was found, supports previous model predictions [Allen et al., 1984] in a qualitative fashion.
Databáze: OpenAIRE
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