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Title: Observation of night OH in the mesosphere
Authors: Pickett, H. M.
Read, W. G.
Lee, K. K.
Yung, Y. L.
Keywords: photochemical properties
chemical kinetics
middle atmosphere
Microwave Limb Sounder (MLS)
Issue Date: 6-Oct-2006
Publisher: American Geophysical Union
Citation: Geophysical Research Letters, Vol. 33, L19808, doi:10.1029/2006GL026910, 2006
Abstract: Satellite measurements from the Aura MLS instrument show a layer of OH near 82 km in the night. This layer confirms earlier measurements by ground-based LIDAR. The MLS and LIDAR observations measure OH in the lowest vibrational state and are distinct, but related chemically, from vibrationally-excited emission from the OH Meinel bands in the near infrared. The Caltech 1-D model has been extended to include vibrational dependence of OH reactions and shows good agreement with MLS OH data and with observations of the Meinel bands. The model shows a chemical lifetime of HOx that increases from less than a day at 80 km to over a month at 87 km. Above this altitude transport processes become an important part of HOx chemistry. The model predicts that ground state OH represents 99% of the total OH up to 84 km.
Appears in Collections:JPL TRS 1992+

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