Published April 4, 2003
| Published
Journal Article
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Measured HDO/H_2O ratios across the tropical tropopause
Abstract
We present the first simultaneous measurements of HDO and H_2O in the tropical upper troposphere (UT) and lower stratosphere (LS) as derived from infrared solar absorption spectra acquired by the Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment. We find, surprisingly, that the observed HDO/H_2O ratio does not decrease with altitude in this region despite a factor of 4–5 decrease in the water vapor mixing ratio. This observation is inconsistent with the view that dehydration in the tropical UT/LS is by gradual processes, and suggests a major role by convective processes.
Additional Information
© 2003 American Geophysical Union. Received 30 January 2003; revised 28 February 2003; accepted 7 March 2003; published 4 April 2003. We thank M. L. Salby for providing the 3-hourly 11-µm brightness temperature data, M. R. Gunson and the ATMOS science team for the acquisition and processing of the ATLAS-3 spectra, and F.W. Irion and B. Sen for help with accessing them. We thank R. A. Toth for making available water vapor spectroscopic parameters prior to their publication, and E. J. Moyer, S. C. Sherwood, A. E. Dessler for helpful discussions.Attached Files
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- Eprint ID
- 46586
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- CaltechAUTHORS:20140701-074011166
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2014-07-01Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field
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- Division of Geological and Planetary Sciences