Hydroxyl airglow temperatures above Davis Station, Antarctica ...

• Main Author: French, W. John R.
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Davis Station; Davis-Station; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.25959/23246936; https://figshare.utas.edu.au/articles/thesis/Hydroxyl_airglow_temperatures_above_Davis_Station_Antarctica/23246936

The hydroxyl airglow (6-2) band has been monitored above Davis station, Antarctica (68.6°S, 78.0°E) by means of a Czerny-Turner spectrometer since 1990. This thesis is an investigation of the long-term trends and variability in OH(6-2) rotational-temperatures over an 11 year time span. Tropospheric warming, due to increased greenhouse gases concentrations over the last 150 years, is expected to be associated with enhanced cooling in the stratosphere and mesosphere. Modelling studies indicate a maximum cooling response in the high latitude mesosphere. Some reported observations suggest that pronounced cooling, (up to 7 K/decade) in excess of model predictions, has already taken place. Hydroxyl airglow emissions originate near 87 km. The layer is ideally located to monitor mesopause region temperatures by ground based spectroscopic means. The Davis OH(6-2) database contains 8 years of observations that span 1990 to 2000; over 126,000 spectra, which yield 1310 nightly averages. Observations are limited ...