D/H isotope ratios in the global hydrologic cycle Public Deposited


This is the publisher’s final pdf. The article is copyrighted by American Geophysical Union and published by John Wiley & Sons Ltd. It can be found at:  http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/%28ISSN%291944-8007/

Surface isotope data collected during cruises were first presented in Uemura et al. [2008], Kurita [2013], and Benetti et al. [2014] and are available by request from Naoyuki Kurita ( nkurita1126@nifty.com) and Marion Benetti ( marionbenetti@locean-ipsl.upmc.fr) as well as in Table 2 of Uemura et al. [2008]. Tropospheric Emissions Spectrometer data is available at  http://tes.jpl.nasa.gov/. Globally gridded precipitation isotope values were first reported in Bowen and Revenaugh [2003], with data sets available at  http://waterisotopes.org and by request from Gabriel Bowen ( gabe.bowen@utah.edu).

Dataset located at:  http://onlinelibrary.wiley.com/doi/10.1002/2015GL064117/


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Abstract or Summary
  • Deuterium to hydrogen (D/H) ratios in Earth’s hydrologic cycle have long served as important tracers of climate processes, yet the global HDO budget remains poorly constrained because of uncertainties in the isotopic compositions of continental evapotranspiration and runoff. Here bias-corrected satellite retrievals of HDO and H₂O concentrations from the Tropospheric Emissions Spectrometer are used to estimate the marine atmospheric surface layer HDO vapor pressure deficit, from which we calculate the global flux-weighted average oceanic evaporation isotopic composition as -37.6‰. Using these estimates, combined with D/H ratios in precipitation, global mass balance suggests H isotope compositions for global runoff and terrestrial evapotranspiration of -77.3‰ and -40.0‰, respectively. By resolving the HDO budget, we establish an accurate global baseline for geochemically enabled Earth system models, demonstrate patterns in entrainment of moisture into the marine surface layer, and determine the isotopic composition of continental fluxes critical for global ecohydrologic investigations.
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Date Issued
  • Good, S. P., Noone, D., Kurita, N., Benetti, M., & Bowen, G. J. (2015). D/H isotope ratios in the global hydrologic cycle. Geophysical Research Letters, 42(12), 5042-5050. doi:10.1002/2015GL064117
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