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Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland
Several recent studies from both Greenland and Antarctica have reported significant changes in the water isotopic composition of near‐surface snow between precipitation events. These changes have been linked to isotopic exchange with atmospheric water vapor and sublimation‐induced fractionation, but...
Autores principales: | , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559289/ https://www.ncbi.nlm.nih.gov/pubmed/31218150 http://dx.doi.org/10.1029/2018JD029619 |
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author | Madsen, M. V. Steen‐Larsen, H. C. Hörhold, M. Box, J. Berben, S. M. P. Capron, E. Faber, A.‐K. Hubbard, A. Jensen, M. F. Jones, T. R. Kipfstuhl, S. Koldtoft, I. Pillar, H. R. Vaughn, B. H. Vladimirova, D. Dahl‐Jensen, D. |
author_facet | Madsen, M. V. Steen‐Larsen, H. C. Hörhold, M. Box, J. Berben, S. M. P. Capron, E. Faber, A.‐K. Hubbard, A. Jensen, M. F. Jones, T. R. Kipfstuhl, S. Koldtoft, I. Pillar, H. R. Vaughn, B. H. Vladimirova, D. Dahl‐Jensen, D. |
author_sort | Madsen, M. V. |
collection | PubMed |
description | Several recent studies from both Greenland and Antarctica have reported significant changes in the water isotopic composition of near‐surface snow between precipitation events. These changes have been linked to isotopic exchange with atmospheric water vapor and sublimation‐induced fractionation, but the processes are poorly constrained by observations. Understanding and quantifying these processes are crucial to both the interpretation of ice core climate proxies and the formulation of isotope‐enabled general circulation models. Here, we present continuous measurements of the water isotopic composition in surface snow and atmospheric vapor together with near‐surface atmospheric turbulence and snow‐air latent and sensible heat fluxes, obtained at the East Greenland Ice‐Core Project drilling site in summer 2016. For two 4‐day‐long time periods, significant diurnal variations in atmospheric water isotopologues are observed. A model is developed to explore the impact of this variability on the surface snow isotopic composition. Our model suggests that the snow isotopic composition in the upper subcentimeter of the snow exhibits a diurnal variation with amplitudes in δ(18)O and δD of ~2.5‰ and ~13‰, respectively. As comparison, such changes correspond to 10–20% of the magnitude of seasonal changes in interior Greenland snow pack isotopes and of the change across a glacial‐interglacial transition. Importantly, our observation and model results suggest, that sublimation‐induced fractionation needs to be included in simulations of exchanges between the vapor and the snow surface on diurnal timescales during summer cloud‐free conditions in northeast Greenland. |
format | Online Article Text |
id | pubmed-6559289 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-65592892019-06-17 Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland Madsen, M. V. Steen‐Larsen, H. C. Hörhold, M. Box, J. Berben, S. M. P. Capron, E. Faber, A.‐K. Hubbard, A. Jensen, M. F. Jones, T. R. Kipfstuhl, S. Koldtoft, I. Pillar, H. R. Vaughn, B. H. Vladimirova, D. Dahl‐Jensen, D. J Geophys Res Atmos Research Articles Several recent studies from both Greenland and Antarctica have reported significant changes in the water isotopic composition of near‐surface snow between precipitation events. These changes have been linked to isotopic exchange with atmospheric water vapor and sublimation‐induced fractionation, but the processes are poorly constrained by observations. Understanding and quantifying these processes are crucial to both the interpretation of ice core climate proxies and the formulation of isotope‐enabled general circulation models. Here, we present continuous measurements of the water isotopic composition in surface snow and atmospheric vapor together with near‐surface atmospheric turbulence and snow‐air latent and sensible heat fluxes, obtained at the East Greenland Ice‐Core Project drilling site in summer 2016. For two 4‐day‐long time periods, significant diurnal variations in atmospheric water isotopologues are observed. A model is developed to explore the impact of this variability on the surface snow isotopic composition. Our model suggests that the snow isotopic composition in the upper subcentimeter of the snow exhibits a diurnal variation with amplitudes in δ(18)O and δD of ~2.5‰ and ~13‰, respectively. As comparison, such changes correspond to 10–20% of the magnitude of seasonal changes in interior Greenland snow pack isotopes and of the change across a glacial‐interglacial transition. Importantly, our observation and model results suggest, that sublimation‐induced fractionation needs to be included in simulations of exchanges between the vapor and the snow surface on diurnal timescales during summer cloud‐free conditions in northeast Greenland. John Wiley and Sons Inc. 2019-03-18 2019-03-27 /pmc/articles/PMC6559289/ /pubmed/31218150 http://dx.doi.org/10.1029/2018JD029619 Text en ©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
spellingShingle | Research Articles Madsen, M. V. Steen‐Larsen, H. C. Hörhold, M. Box, J. Berben, S. M. P. Capron, E. Faber, A.‐K. Hubbard, A. Jensen, M. F. Jones, T. R. Kipfstuhl, S. Koldtoft, I. Pillar, H. R. Vaughn, B. H. Vladimirova, D. Dahl‐Jensen, D. Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title | Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title_full | Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title_fullStr | Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title_full_unstemmed | Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title_short | Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland |
title_sort | evidence of isotopic fractionation during vapor exchange between the atmosphere and the snow surface in greenland |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559289/ https://www.ncbi.nlm.nih.gov/pubmed/31218150 http://dx.doi.org/10.1029/2018JD029619 |
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