Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium
Among ice core drilling sites in the European Alps, Colle Gnifetti (CG) is the only non-temperate glacier to offer climate records dating back at least 1000 years. This unique long-term archive is the result of an exceptionally low net accumulation driven by wind erosion and rapid annual layer thinn...
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ftuniveneziairis:oai:iris.unive.it:10278/5014724 2024-04-14T08:13:04+00:00 Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium Bohleber P. Erhardt T. Spaulding N. Hoffmann H. Fischer H. Mayewski P. Bohleber, P. Erhardt, T. Spaulding, N. Hoffmann, H. Fischer, H. Mayewski, P. 2018 https://hdl.handle.net/10278/5014724 https://doi.org/10.5194/cp-14-21-2018 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000419807800001 volume:14 issue:1 firstpage:21 lastpage:37 numberofpages:17 journal:CLIMATE OF THE PAST https://hdl.handle.net/10278/5014724 doi:10.5194/cp-14-21-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85045853189 Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2018 ftuniveneziairis https://doi.org/10.5194/cp-14-21-2018 2024-03-21T18:11:36Z Among ice core drilling sites in the European Alps, Colle Gnifetti (CG) is the only non-temperate glacier to offer climate records dating back at least 1000 years. This unique long-term archive is the result of an exceptionally low net accumulation driven by wind erosion and rapid annual layer thinning. However, the full exploitation of the CG time series has been hampered by considerable dating uncertainties and the seasonal summer bias in snow preservation. Using a new core drilled in 2013 we extend annual layer counting, for the first time at CG, over the last 1000 years and add additional constraints to the resulting age scale from radiocarbon dating. Based on this improved age scale, and using a multi-core approach with a neighbouring ice core, we explore the time series of stable water isotopes and the mineral dust proxies Ca2+ and insoluble particles. Also in our latest ice core we face the already known limitation to the quantitative use of the stable isotope variability based on a high and potentially non-stationary isotope/temperature sensitivity at CG. Decadal trends in Ca2+ reveal substantial agreement with instrumental temperature and are explored here as a potential site-specific supplement to the isotope-based temperature reconstruction. The observed coupling between temperature and Ca2+ trends likely results from snow preservation effects and the advection of dust-rich air masses coinciding with warm temperatures. We find that if calibrated against instrumental data, the Ca2+-based temperature reconstruction is in robust agreement with the latest proxy-based summer temperature reconstruction, including a "Little Ice Age" cold period as well as a medieval climate anomaly. Part of the medieval climate period around AD 1100-1200 clearly stands out through an increased occurrence of dust events, potentially resulting from a relative increase in meridional flow and/or dry conditions over the Mediterranean. Article in Journal/Newspaper ice core Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Climate of the Past 14 1 21 37 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Bohleber P. Erhardt T. Spaulding N. Hoffmann H. Fischer H. Mayewski P. Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
Among ice core drilling sites in the European Alps, Colle Gnifetti (CG) is the only non-temperate glacier to offer climate records dating back at least 1000 years. This unique long-term archive is the result of an exceptionally low net accumulation driven by wind erosion and rapid annual layer thinning. However, the full exploitation of the CG time series has been hampered by considerable dating uncertainties and the seasonal summer bias in snow preservation. Using a new core drilled in 2013 we extend annual layer counting, for the first time at CG, over the last 1000 years and add additional constraints to the resulting age scale from radiocarbon dating. Based on this improved age scale, and using a multi-core approach with a neighbouring ice core, we explore the time series of stable water isotopes and the mineral dust proxies Ca2+ and insoluble particles. Also in our latest ice core we face the already known limitation to the quantitative use of the stable isotope variability based on a high and potentially non-stationary isotope/temperature sensitivity at CG. Decadal trends in Ca2+ reveal substantial agreement with instrumental temperature and are explored here as a potential site-specific supplement to the isotope-based temperature reconstruction. The observed coupling between temperature and Ca2+ trends likely results from snow preservation effects and the advection of dust-rich air masses coinciding with warm temperatures. We find that if calibrated against instrumental data, the Ca2+-based temperature reconstruction is in robust agreement with the latest proxy-based summer temperature reconstruction, including a "Little Ice Age" cold period as well as a medieval climate anomaly. Part of the medieval climate period around AD 1100-1200 clearly stands out through an increased occurrence of dust events, potentially resulting from a relative increase in meridional flow and/or dry conditions over the Mediterranean. |
author2 |
Bohleber, P. Erhardt, T. Spaulding, N. Hoffmann, H. Fischer, H. Mayewski, P. |
format |
Article in Journal/Newspaper |
author |
Bohleber P. Erhardt T. Spaulding N. Hoffmann H. Fischer H. Mayewski P. |
author_facet |
Bohleber P. Erhardt T. Spaulding N. Hoffmann H. Fischer H. Mayewski P. |
author_sort |
Bohleber P. |
title |
Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
title_short |
Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
title_full |
Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
title_fullStr |
Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
title_full_unstemmed |
Temperature and mineral dust variability recorded in two low-accumulation Alpine ice cores over the last millennium |
title_sort |
temperature and mineral dust variability recorded in two low-accumulation alpine ice cores over the last millennium |
publishDate |
2018 |
url |
https://hdl.handle.net/10278/5014724 https://doi.org/10.5194/cp-14-21-2018 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000419807800001 volume:14 issue:1 firstpage:21 lastpage:37 numberofpages:17 journal:CLIMATE OF THE PAST https://hdl.handle.net/10278/5014724 doi:10.5194/cp-14-21-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85045853189 |
op_doi |
https://doi.org/10.5194/cp-14-21-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
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37 |
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1796310947550199808 |