TY - JOUR
T1 - First lidar observations of mesospheric hydroxyl
AU - Brinksma, E. J.
AU - Meijer, Y.J.
AU - McDermid, I.S.
AU - Cageao, R.P.
AU - Bergwerff, J.B.
AU - Swart, D.P.J.
AU - Ubachs, W.
AU - Matthews, W.A.
AU - Hogervorst, W.
AU - Hovenier, J. W.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0031831588&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031831588&partnerID=8YFLogxK
U2 - 10.1029/97GL53561
DO - 10.1029/97GL53561
M3 - Article
AN - SCOPUS:0031831588
SN - 0094-8276
VL - 25
SP - 51
EP - 54
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 1
ER -