Modelling of hydrogen and oxygen isotope compositions for local precipitation

Haidong Peng; Bernhard Mayer; Ann-Lise Norman; H. Roy Krouse

doi:10.3402/tellusb.v57i4.16545

Modelling of hydrogen and oxygen isotope compositions for local precipitation

Tellus B: Chemical and Physical Meteorology

Volume 57 (2005): Issue 4

By: Haidong Peng, Bernhard Mayer, Ann-Lise Norman and H. Roy Krouse

Open Access

|Jan 2005

Abstract

Stable isotope compositions of hydrogen and oxygen for continental condensates are determined foremost by equilibrium and kinetic isotope fractionation during evaporation at the oceanic source regions. Subsequently they are modified by a series of in-cloud processes, which include condensation and possible admixture of vapour from evaporation and transpiration over the continents. The effects of vapour admixture from evaporation and transpiration on the isotope compositions of hydrogen (δ²H) and oxygen (δ¹⁸O) for local precipitation are discussed in this paper. Using a modified Rayleigh fractionation model, the effects are described for both constant and stepwise evaporation and transpiration fluxes. Further, deuterium (d)-excess values are employed to estimate the evaporation ratio and the slopes of δ–T polynomial regression curves are used to estimate the transpiration ratio. Finally, the influence of sea surface temperature on isotope compositions in condensates is modelled and its effect on d-excess and regression equations is examined.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusb.v57i4.16545 | Journal eISSN: 1600-0889

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Language: English

Page range: 273 - 282

Submitted on: Feb 9, 2004

Accepted on: Jan 20, 2005

Published on: Jan 1, 2005

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 2005 Haidong Peng, Bernhard Mayer, Ann-Lise Norman, H. Roy Krouse, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 57 (2005): Issue 4