Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements
Surface processes in high latitudes play an important role in global climate and thus understanding the physics of these systems is critical for improving climate projections. The characterization of the stable water isotopologue flux between the surface and the atmosphere offers the potential to co...
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ftawi:oai:epic.awi.de:54797 2024-09-15T18:04:21+00:00 Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements Wahl, S. Steen‐Larsen, H. C. Reuder, J. Hörhold, M. 2021 https://epic.awi.de/id/eprint/54797/ https://doi.org/10.1029/2020JD034400 https://hdl.handle.net/10013/epic.09ebfee2-2ab4-40a5-a90c-721d7eccb95a unknown Wahl, S. , Steen‐Larsen, H. C. , Reuder, J. and Hörhold, M. (2021) Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements , Journal of Geophysical Research: Atmospheres, 126 (13) . doi:10.1029/2020JD034400 <https://doi.org/10.1029/2020JD034400> , hdl:10013/epic.09ebfee2-2ab4-40a5-a90c-721d7eccb95a EPIC3Journal of Geophysical Research: Atmospheres, 126(13), ISSN: 2169-897X Article isiRev 2021 ftawi https://doi.org/10.1029/2020JD034400 2024-06-24T04:27:29Z Surface processes in high latitudes play an important role in global climate and thus understanding the physics of these systems is critical for improving climate projections. The characterization of the stable water isotopologue flux between the surface and the atmosphere offers the potential to constrain parameterizations of these physical surface exchange processes in numerical models. In addition, observations of isotopologue surface fluxes allow the evaluation of surface fluxes as a process influencing the formation of the climate signal retrieved from ice core isotopologue records. Here, we present a record of stable water isotopologue surface fluxes measured in-situ in the accumulation zone of the Greenland Ice Sheet at the East Greenland Ice Core Project site. We measured isotopologue fluxes above the snow surface directly by combining high-frequency eddy covariance measurements with low-frequency isotopologue measurements from a cavity ring-down spectrometer (CRDS). We developed a method to correct for the high-frequency loss of the CRDS by combining humidity measurements from both the CRDS and eddy covariance instruments. Using this approach our measurements provide the first direct observations of water isotopologue fluxes in polar areas. We observed a clear diurnal cycle in the fluxes of the different water isotopologues. The isotopic composition of the sublimation and deposition flux showed to be dependent on the snow and vapor isotopic composition, respectively. To a first order, the isotopic composition of the sublimation flux could be derived assuming equilibrium fractionation during sublimation. Article in Journal/Newspaper East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Atmospheres 126 13 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Surface processes in high latitudes play an important role in global climate and thus understanding the physics of these systems is critical for improving climate projections. The characterization of the stable water isotopologue flux between the surface and the atmosphere offers the potential to constrain parameterizations of these physical surface exchange processes in numerical models. In addition, observations of isotopologue surface fluxes allow the evaluation of surface fluxes as a process influencing the formation of the climate signal retrieved from ice core isotopologue records. Here, we present a record of stable water isotopologue surface fluxes measured in-situ in the accumulation zone of the Greenland Ice Sheet at the East Greenland Ice Core Project site. We measured isotopologue fluxes above the snow surface directly by combining high-frequency eddy covariance measurements with low-frequency isotopologue measurements from a cavity ring-down spectrometer (CRDS). We developed a method to correct for the high-frequency loss of the CRDS by combining humidity measurements from both the CRDS and eddy covariance instruments. Using this approach our measurements provide the first direct observations of water isotopologue fluxes in polar areas. We observed a clear diurnal cycle in the fluxes of the different water isotopologues. The isotopic composition of the sublimation and deposition flux showed to be dependent on the snow and vapor isotopic composition, respectively. To a first order, the isotopic composition of the sublimation flux could be derived assuming equilibrium fractionation during sublimation. |
format |
Article in Journal/Newspaper |
author |
Wahl, S. Steen‐Larsen, H. C. Reuder, J. Hörhold, M. |
spellingShingle |
Wahl, S. Steen‐Larsen, H. C. Reuder, J. Hörhold, M. Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
author_facet |
Wahl, S. Steen‐Larsen, H. C. Reuder, J. Hörhold, M. |
author_sort |
Wahl, S. |
title |
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
title_short |
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
title_full |
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
title_fullStr |
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
title_full_unstemmed |
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements |
title_sort |
quantifying the stable water isotopologue exchange between the snow surface and lower atmosphere by direct flux measurements |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54797/ https://doi.org/10.1029/2020JD034400 https://hdl.handle.net/10013/epic.09ebfee2-2ab4-40a5-a90c-721d7eccb95a |
genre |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
genre_facet |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
op_source |
EPIC3Journal of Geophysical Research: Atmospheres, 126(13), ISSN: 2169-897X |
op_relation |
Wahl, S. , Steen‐Larsen, H. C. , Reuder, J. and Hörhold, M. (2021) Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements , Journal of Geophysical Research: Atmospheres, 126 (13) . doi:10.1029/2020JD034400 <https://doi.org/10.1029/2020JD034400> , hdl:10013/epic.09ebfee2-2ab4-40a5-a90c-721d7eccb95a |
op_doi |
https://doi.org/10.1029/2020JD034400 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
13 |
_version_ |
1810441838533804032 |