Unprecedented recent summer warmth in Arctic Canada
Arctic air temperatures have increased in recent decades, along with documented reductions in sea ice, glacier size, and snow cover. However, the extent to which recent Arctic warming has been anomalous with respect to long-term natural climate variability remains uncertain. Here we use 145 radiocar...
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2013
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/28670 2023-06-11T04:08:06+02:00 Unprecedented recent summer warmth in Arctic Canada Miller, Gifford Lehman, S. Refsnider, K. Southon, J. Zhong, Y. 2013 restricted https://hdl.handle.net/20.500.11937/28670 unknown American Geophysical Union http://onlinelibrary.wiley.com/doi/10.1002/2013GL057188/suppinfo http://hdl.handle.net/20.500.11937/28670 greenland ice-sheet regeneration maximum Arctic amplification insolation glaciers core recent warming holocene climate-change Arctic Journal Article 2013 ftcurtin https://doi.org/20.500.11937/28670 2023-05-30T19:35:05Z Arctic air temperatures have increased in recent decades, along with documented reductions in sea ice, glacier size, and snow cover. However, the extent to which recent Arctic warming has been anomalous with respect to long-term natural climate variability remains uncertain. Here we use 145 radiocarbon dates on rooted tundra plants revealed by receding cold-based ice caps in the eastern Canadian Arctic to show that 5000years of regional summertime cooling has been reversed, with average summer temperatures of the last similar to 100years now higher than during any century in more than 44,000years, including the peak warmth of the early Holocene when high-latitude summer insolation was 9% greater than present. Reconstructed changes in snowline elevation suggest that summers cooled similar to 2.7 degrees C over the past 5000years, approximately twice the response predicted by Coupled Model Intercomparison Project Phase 5 climate models. Our results indicate that anthropogenic increases in greenhouse gases have led to unprecedented regional warmth. Article in Journal/Newspaper Arctic Climate change glacier glacier* Greenland Ice Sheet Sea ice Tundra Curtin University: espace Arctic Canada Greenland |
institution |
Open Polar |
collection |
Curtin University: espace |
op_collection_id |
ftcurtin |
language |
unknown |
topic |
greenland ice-sheet regeneration maximum Arctic amplification insolation glaciers core recent warming holocene climate-change Arctic |
spellingShingle |
greenland ice-sheet regeneration maximum Arctic amplification insolation glaciers core recent warming holocene climate-change Arctic Miller, Gifford Lehman, S. Refsnider, K. Southon, J. Zhong, Y. Unprecedented recent summer warmth in Arctic Canada |
topic_facet |
greenland ice-sheet regeneration maximum Arctic amplification insolation glaciers core recent warming holocene climate-change Arctic |
description |
Arctic air temperatures have increased in recent decades, along with documented reductions in sea ice, glacier size, and snow cover. However, the extent to which recent Arctic warming has been anomalous with respect to long-term natural climate variability remains uncertain. Here we use 145 radiocarbon dates on rooted tundra plants revealed by receding cold-based ice caps in the eastern Canadian Arctic to show that 5000years of regional summertime cooling has been reversed, with average summer temperatures of the last similar to 100years now higher than during any century in more than 44,000years, including the peak warmth of the early Holocene when high-latitude summer insolation was 9% greater than present. Reconstructed changes in snowline elevation suggest that summers cooled similar to 2.7 degrees C over the past 5000years, approximately twice the response predicted by Coupled Model Intercomparison Project Phase 5 climate models. Our results indicate that anthropogenic increases in greenhouse gases have led to unprecedented regional warmth. |
format |
Article in Journal/Newspaper |
author |
Miller, Gifford Lehman, S. Refsnider, K. Southon, J. Zhong, Y. |
author_facet |
Miller, Gifford Lehman, S. Refsnider, K. Southon, J. Zhong, Y. |
author_sort |
Miller, Gifford |
title |
Unprecedented recent summer warmth in Arctic Canada |
title_short |
Unprecedented recent summer warmth in Arctic Canada |
title_full |
Unprecedented recent summer warmth in Arctic Canada |
title_fullStr |
Unprecedented recent summer warmth in Arctic Canada |
title_full_unstemmed |
Unprecedented recent summer warmth in Arctic Canada |
title_sort |
unprecedented recent summer warmth in arctic canada |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
https://hdl.handle.net/20.500.11937/28670 |
geographic |
Arctic Canada Greenland |
geographic_facet |
Arctic Canada Greenland |
genre |
Arctic Climate change glacier glacier* Greenland Ice Sheet Sea ice Tundra |
genre_facet |
Arctic Climate change glacier glacier* Greenland Ice Sheet Sea ice Tundra |
op_relation |
http://onlinelibrary.wiley.com/doi/10.1002/2013GL057188/suppinfo http://hdl.handle.net/20.500.11937/28670 |
op_doi |
https://doi.org/20.500.11937/28670 |
_version_ |
1768381220082679808 |