Deuterium excess reveals diurnal sources of water vapor in forest air.

Oecologia
Chun-Ta Lai, J R Ehleringer

Abstract

An understanding of atmospheric water vapor content and its isotopic composition is important if we are to be able to model future water vapor dynamics and their potential feedback on future climate change. Here we present diurnal and vertical patterns of water isotope ratios in forest air (δ(2)H(v) and δ(18)O(v)) not observed previously. Water vapor observed at three heights over 3 consecutive days in a coniferous forest in the Pacific Northwest of the United States, shows a stratified nocturnal structure of δ(2)H(v) and δ(18)O(v), with the most positive values consistently observed above the canopy (60 m). Differences between 0.5 m and 60 m range between 2-6‰ for δ(18)O and 20-40‰ for δ(2)H at night. Using a box model, we simulated H(2)O isotope fluxes and showed that the low to high δ(2)H(v) and δ(18)O(v) profiles can be explained by the vapor flux associated with evaporation from the forest floor and canopy transpiration. We used d-excess as a diagnostic tracer to identify processes that contribute to the diurnal variation in atmospheric moisture. Values of d-excess derived from water vapor measurements showed a repeated diel pattern, with the lowest values occurring in the early morning and the highest values occurring at ...Continue Reading

References

Mar 29, 1974·Radiation and Environmental Biophysics·G DongmannK Wagener
Apr 23, 2002·Rapid Communications in Mass Spectrometry : RCM·Brent R HellikerJames R Ehleringer
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Citations

Aug 27, 2014·Ecological Applications : a Publication of the Ecological Society of America·Steven L VoelkerJirí Santrůcek
May 23, 2015·Plant, Cell & Environment·Xin SongMargaret M Barbour
Oct 19, 2011·Rapid Communications in Mass Spectrometry : RCM·Natalie M SchultzJohn M Baker
Sep 23, 2014·Forensic Science International : Synergy·John D HowaJames R Ehleringer
Apr 8, 2017·Isotopes in Environmental and Health Studies·E A N V EdirisingheR L Wijayawardane
Dec 1, 2016·Reviews of Geophysics·Joseph GalewskyMatthias Schneider
May 4, 2021·Plant, Cell & Environment·Graham D FarquharMargaret M Barbour

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