Measured HDO/H2O ratios across the tropical tropopause

Details Measured HDO/H2O ratios across the tropical tropopause Measured HDO/H2O ratios across the tropical tropopause

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30g..25k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 7, pp. 25-1, CiteID 1372, DOI 10.1029/2003GL017023

Physics

27

Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry, Atmospheric Composition And Structure: General Or Miscellaneous, Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions

Scientific paper

We present the first simultaneous measurements of HDO and H2O 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/H2O 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.

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