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Inter-comparison of TES HDO/H2O Ratio with In Situ HDO and H2O from the 2008 Mauna Loa Campaign

John Worden(1), David Noone(2), Derek Brown(2), Jeonghoon Lee(1), Kevin Bowman(1) and Joe Galewsky and TES & HAVAIKI team members(3)

(1) Jet Propulsion Laboratory, California Institute of Technology, California, United States
(2) CIRES / U. of Colorado, -, Colorado, United States
(3) University of New Mexico, -, New Mexico, Mexico

Abstract

We Present an inter-comparison between satellite observations of water vapor and its isotopes from the Aura Tropospheric Emission Spectrometer (TES) and in-situ measurements of the isotopic composition of water taken at the Hawaii Mauna Loa Observatory during October 2008. The in-situ measurements of the HDO/H2O ratio show a strong diurnal variation between -350 to -100 parts per thousand relative to the isotopic composition of ocean water (SMOW) with the most depleted values during the night when the boundary layer is below the observatory. Analysis of the TES data indicate that the TES observations are primarily sensitive to the free troposphere and would only be able to observe at most about 25 parts per thousand of this diurnal variability. Comparison of the distribution of TES data to the night-time in situ data reveal about a 4% bias in the HDO/H2O ratio, consistent with prior expectations discussed in Worden et al., JGR, 2006.