Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records
Surface processes alter the water stable isotope signal of the surface snow after deposition. However, it remains an open question to which extent surface post-depositional processes should be considered when inferring past climate information from ice core records. Here, we present simulations for...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2023
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Online Access: | https://epic.awi.de/id/eprint/58130/ https://epic.awi.de/id/eprint/58130/1/Dietrich_et_al_2023.pdf https://doi.org/10.1029/2023gl104249 https://hdl.handle.net/10013/epic.6598c00c-423b-4dec-99f5-84039b38492f |
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ftawi:oai:epic.awi.de:58130 2023-12-24T10:17:11+01:00 Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records Dietrich, Laura J Steen‐Larsen, Hans Christian Wahl, Sonja Jones, Tyler R Town, Michael S Werner, Martin 2023-10-28 application/pdf https://epic.awi.de/id/eprint/58130/ https://epic.awi.de/id/eprint/58130/1/Dietrich_et_al_2023.pdf https://doi.org/10.1029/2023gl104249 https://hdl.handle.net/10013/epic.6598c00c-423b-4dec-99f5-84039b38492f unknown American Geophysical Union (AGU) https://epic.awi.de/id/eprint/58130/1/Dietrich_et_al_2023.pdf Dietrich, L. J. , Steen‐Larsen, H. C. , Wahl, S. , Jones, T. R. , Town, M. S. and Werner, M. orcid:0000-0002-6473-0243 (2023) Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records , Geophysical Research Letters, 50 (20) . doi:10.1029/2023gl104249 <https://doi.org/10.1029/2023gl104249> , hdl:10013/epic.6598c00c-423b-4dec-99f5-84039b38492f EPIC3Geophysical Research Letters, American Geophysical Union (AGU), 50(20), ISSN: 0094-8276 Article isiRev 2023 ftawi https://doi.org/10.1029/2023gl104249 2023-11-27T00:23:17Z Surface processes alter the water stable isotope signal of the surface snow after deposition. However, it remains an open question to which extent surface post-depositional processes should be considered when inferring past climate information from ice core records. Here, we present simulations for the Greenland Ice Sheet, combining outputs from two climate models with an isotope-enabled snowpack model. We show that surface vapor exchange and associated fractionation imprint a climate signal into the firn, resulting in an increase in the annual mean value of δ18O by +2.3‰ and a reduction in d-excess by −6.3‰. Further, implementing isotopic fractionation during surface vapor exchange improves the representation of the observed seasonal amplitude in δ18O from 65.0% to 100.2%. Our results stress that surface vapor exchange is important in the climate proxy signal formation and needs consideration when interpreting ice core climate records. Article in Journal/Newspaper Greenland ice core Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Geophysical Research Letters 50 20 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Surface processes alter the water stable isotope signal of the surface snow after deposition. However, it remains an open question to which extent surface post-depositional processes should be considered when inferring past climate information from ice core records. Here, we present simulations for the Greenland Ice Sheet, combining outputs from two climate models with an isotope-enabled snowpack model. We show that surface vapor exchange and associated fractionation imprint a climate signal into the firn, resulting in an increase in the annual mean value of δ18O by +2.3‰ and a reduction in d-excess by −6.3‰. Further, implementing isotopic fractionation during surface vapor exchange improves the representation of the observed seasonal amplitude in δ18O from 65.0% to 100.2%. Our results stress that surface vapor exchange is important in the climate proxy signal formation and needs consideration when interpreting ice core climate records. |
format |
Article in Journal/Newspaper |
author |
Dietrich, Laura J Steen‐Larsen, Hans Christian Wahl, Sonja Jones, Tyler R Town, Michael S Werner, Martin |
spellingShingle |
Dietrich, Laura J Steen‐Larsen, Hans Christian Wahl, Sonja Jones, Tyler R Town, Michael S Werner, Martin Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
author_facet |
Dietrich, Laura J Steen‐Larsen, Hans Christian Wahl, Sonja Jones, Tyler R Town, Michael S Werner, Martin |
author_sort |
Dietrich, Laura J |
title |
Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
title_short |
Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
title_full |
Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
title_fullStr |
Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
title_full_unstemmed |
Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records |
title_sort |
snow‐atmosphere humidity exchange at the ice sheet surface alters annual mean climate signals in ice core records |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/58130/ https://epic.awi.de/id/eprint/58130/1/Dietrich_et_al_2023.pdf https://doi.org/10.1029/2023gl104249 https://hdl.handle.net/10013/epic.6598c00c-423b-4dec-99f5-84039b38492f |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
EPIC3Geophysical Research Letters, American Geophysical Union (AGU), 50(20), ISSN: 0094-8276 |
op_relation |
https://epic.awi.de/id/eprint/58130/1/Dietrich_et_al_2023.pdf Dietrich, L. J. , Steen‐Larsen, H. C. , Wahl, S. , Jones, T. R. , Town, M. S. and Werner, M. orcid:0000-0002-6473-0243 (2023) Snow‐Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records , Geophysical Research Letters, 50 (20) . doi:10.1029/2023gl104249 <https://doi.org/10.1029/2023gl104249> , hdl:10013/epic.6598c00c-423b-4dec-99f5-84039b38492f |
op_doi |
https://doi.org/10.1029/2023gl104249 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
20 |
_version_ |
1786205139576553472 |