Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland
During recent decades, stable oxygen isotopes derived from tree-ring cellulose (δ18OTRC) have been frequently utilised as the baseline for palaeoclimatic reconstructions. In this context, numerous studies take advantage of the high sensitivity of trees close to their ecological distribution limit (h...
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ftunivzuerich:oai:www.zora.uzh.ch:209443 2024-06-23T07:56:02+00:00 Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland Griessinger, Jussi Meier, Wolfgang Jens-Henrik Bast, Alexander Debel, Annette Gärtner-Roer, Isabelle Gärtner, Holger 2021-06-28 application/pdf https://www.zora.uzh.ch/id/eprint/209443/ https://www.zora.uzh.ch/id/eprint/209443/1/2021_atmosphere-12-00836-v3.pdf https://doi.org/10.5167/uzh-209443 https://doi.org/10.3390/atmos12070836 eng eng MDPI Publishing https://www.zora.uzh.ch/id/eprint/209443/1/2021_atmosphere-12-00836-v3.pdf doi:10.5167/uzh-209443 doi:10.3390/atmos12070836 urn:issn:2073-4433 info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ Griessinger, Jussi; Meier, Wolfgang Jens-Henrik; Bast, Alexander; Debel, Annette; Gärtner-Roer, Isabelle; Gärtner, Holger (2021). Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland. Atmosphere, 12(7):836. Institute of Geography 910 Geography & travel Atmospheric Science Environmental Science (miscellaneous) Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftunivzuerich https://doi.org/10.5167/uzh-20944310.3390/atmos12070836 2024-05-29T01:11:41Z During recent decades, stable oxygen isotopes derived from tree-ring cellulose (δ18OTRC) have been frequently utilised as the baseline for palaeoclimatic reconstructions. In this context, numerous studies take advantage of the high sensitivity of trees close to their ecological distribution limit (high elevation or high latitudes). However, this increases the chance that indirect climatic forces such as cold ground induced by permafrost can distort the climate-proxy relationship. In this study, a tree stand of sub-alpine larch trees (Larix decidua Mill.) located in an inner alpine dry valley (Val Bever), Switzerland, was analysed for its δ18OTRC variations during the last 180 years. A total of eight L. decidua trees were analysed on an individual base, half of which are located on verified sporadic permafrost lenses approximately 500 m below the expected lower limit of discontinuous permafrost. The derived isotope time series are strongly dependent on variations in summer temperature, precipitation and large-scale circulation patterns (geopotential height fields). The results demonstrate that trees growing outside of the permafrost distribution provide a significantly stronger and more consistent climate-proxy relationship over time than permafrost-affected tree stands. The climate sensitivity of permafrost-affected trees is analogical to the permafrost-free tree stands (positive and negative correlations with temperature and precipitation, respectively) but attenuated partly leading to a complete loss of significance. In particular, decadal summer temperature variations are well reflected in δ18OTRC from permafrost-free sites (r = 0.62, p < 0.01), while permafrost-affected sites demonstrate a full lack of this dependency (r = 0.30, p > 0.05). Since both tree stands are located just a few meters away from one another and are subject to the same climatic influences, discrepancies in the isotope time series can only be attributed to variations in the trees’ source water that constraints the climatic ... Article in Journal/Newspaper permafrost University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel Atmospheric Science Environmental Science (miscellaneous) |
spellingShingle |
Institute of Geography 910 Geography & travel Atmospheric Science Environmental Science (miscellaneous) Griessinger, Jussi Meier, Wolfgang Jens-Henrik Bast, Alexander Debel, Annette Gärtner-Roer, Isabelle Gärtner, Holger Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
topic_facet |
Institute of Geography 910 Geography & travel Atmospheric Science Environmental Science (miscellaneous) |
description |
During recent decades, stable oxygen isotopes derived from tree-ring cellulose (δ18OTRC) have been frequently utilised as the baseline for palaeoclimatic reconstructions. In this context, numerous studies take advantage of the high sensitivity of trees close to their ecological distribution limit (high elevation or high latitudes). However, this increases the chance that indirect climatic forces such as cold ground induced by permafrost can distort the climate-proxy relationship. In this study, a tree stand of sub-alpine larch trees (Larix decidua Mill.) located in an inner alpine dry valley (Val Bever), Switzerland, was analysed for its δ18OTRC variations during the last 180 years. A total of eight L. decidua trees were analysed on an individual base, half of which are located on verified sporadic permafrost lenses approximately 500 m below the expected lower limit of discontinuous permafrost. The derived isotope time series are strongly dependent on variations in summer temperature, precipitation and large-scale circulation patterns (geopotential height fields). The results demonstrate that trees growing outside of the permafrost distribution provide a significantly stronger and more consistent climate-proxy relationship over time than permafrost-affected tree stands. The climate sensitivity of permafrost-affected trees is analogical to the permafrost-free tree stands (positive and negative correlations with temperature and precipitation, respectively) but attenuated partly leading to a complete loss of significance. In particular, decadal summer temperature variations are well reflected in δ18OTRC from permafrost-free sites (r = 0.62, p < 0.01), while permafrost-affected sites demonstrate a full lack of this dependency (r = 0.30, p > 0.05). Since both tree stands are located just a few meters away from one another and are subject to the same climatic influences, discrepancies in the isotope time series can only be attributed to variations in the trees’ source water that constraints the climatic ... |
format |
Article in Journal/Newspaper |
author |
Griessinger, Jussi Meier, Wolfgang Jens-Henrik Bast, Alexander Debel, Annette Gärtner-Roer, Isabelle Gärtner, Holger |
author_facet |
Griessinger, Jussi Meier, Wolfgang Jens-Henrik Bast, Alexander Debel, Annette Gärtner-Roer, Isabelle Gärtner, Holger |
author_sort |
Griessinger, Jussi |
title |
Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
title_short |
Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
title_full |
Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
title_fullStr |
Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
title_full_unstemmed |
Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland |
title_sort |
permafrost biases climate signals in δ18otree-ring series from a sub-alpine tree stand in val bever/switzerland |
publisher |
MDPI Publishing |
publishDate |
2021 |
url |
https://www.zora.uzh.ch/id/eprint/209443/ https://www.zora.uzh.ch/id/eprint/209443/1/2021_atmosphere-12-00836-v3.pdf https://doi.org/10.5167/uzh-209443 https://doi.org/10.3390/atmos12070836 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Griessinger, Jussi; Meier, Wolfgang Jens-Henrik; Bast, Alexander; Debel, Annette; Gärtner-Roer, Isabelle; Gärtner, Holger (2021). Permafrost biases climate signals in δ18Otree-ring series from a sub-alpine tree stand in Val Bever/Switzerland. Atmosphere, 12(7):836. |
op_relation |
https://www.zora.uzh.ch/id/eprint/209443/1/2021_atmosphere-12-00836-v3.pdf doi:10.5167/uzh-209443 doi:10.3390/atmos12070836 urn:issn:2073-4433 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5167/uzh-20944310.3390/atmos12070836 |
_version_ |
1802648886790062080 |