Abstract
We present direct observations of Mars zonal wind velocities around northern spring equinox (L S = 336°, L S = 355°, L S = 42°) during martian year 27 and 29. Data was acquired by means of infrared heterodyne spectroscopy of CO 2 features at 959.3917 cm −1 (10.4232 μm) and 957.8005 cm −1 (10.4405 μm) using the Cologne Tuneable Heterodyne Infrared Spectrometer (THIS) at the McMath–Pierce telescope of the National Solar Observatory on Kitt Peak in Arizona and the NASA Infrared Telescope Facility on Mauna Kea, Hawaii between 2005 and 2008. Winds were measured on the dayside of Mars with an unprecedented spatial resolution allowing sampling of up to nine independent latitudes over the martian disk. Retrieved wind velocities depend strongly on latitude and season with values ranging from 180 m/s prograde to −94 m/s retrograde. A comparison of the observational results to predicted values from the Mars Climate Database yield a reasonable agreement between modeling and observation.
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