18 April 2003 Infrared limb sounding measurements of middle-atmosphere gravity waves by CRISTA
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Abstract
We consider the example of the CRyogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) experiment to deduce the sensitivity of an infrared emission limb sounder to gravity waves of different horizontal and vertical wavelength. The sensitivity studies show that gravity waves with horizontal wavelengths of the order of 100-200 km or longer can be detected. The deduced sensitivity factors are validated by comparing CRISTA and data sonde temperature profiles. Analysis of CRISTA temperature data reveals large gravity wave amplitudes in the stratosphere over southernmost South America. The horizontal structure is compared to model calculations. Global distributions are discussed with respect to convective sources, wind modulation, and Coriolis force modulation. It is shown that even the very dense spatial sampling of the CRISTA instrument is insufficient to fully resolve the horizontal structure of the waves which are seen in the vertical. Hence, increased spatial resolution of about 50 X 50 km or better is required to obtain all information the limb sounding technique is capable to provide.
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Peter Preusse, Stephen D. Eckermann, Manfred Ern, Francis J. Schmidlin, M. Joan Alexander, Dirk Offermann, "Infrared limb sounding measurements of middle-atmosphere gravity waves by CRISTA", Proc. SPIE 4882, Remote Sensing of Clouds and the Atmosphere VII, (18 April 2003); doi: 10.1117/12.463374; https://doi.org/10.1117/12.463374
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