Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years
Understanding how internal climate variability influences arctic regions is required to better forecast future global climate variations. This paper investigates an annually-laminated (varved) record from the western Canadian Arctic and finds that the varves are negatively correlated with both the i...
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ftcopernicus:oai:publications.copernicus.org:cp55859 2023-05-15T14:34:19+02:00 Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years Lapointe, François Francus, Pierre Lamoureux, Scott F. Vuille, Mathias Jenny, Jean-Philippe Bradley, Raymond S. Massa, Charly 2018-09-27 application/pdf https://doi.org/10.5194/cp-13-411-2017 https://cp.copernicus.org/articles/13/411/2017/ eng eng doi:10.5194/cp-13-411-2017 https://cp.copernicus.org/articles/13/411/2017/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-13-411-2017 2020-07-20T16:23:45Z Understanding how internal climate variability influences arctic regions is required to better forecast future global climate variations. This paper investigates an annually-laminated (varved) record from the western Canadian Arctic and finds that the varves are negatively correlated with both the instrumental Pacific Decadal Oscillation (PDO) during the past century and also with reconstructed PDO over the past 700 years, suggesting drier Arctic conditions during high-PDO phases, and vice versa. These results are in agreement with known regional teleconnections, whereby the PDO is negatively and positively correlated with summer precipitation and mean sea level pressure respectively. This pattern is also evident during the positive phase of the North Pacific Index (NPI) in autumn. Reduced sea-ice cover during summer–autumn is observed in the region during PDO− (NPI+) and is associated with low-level southerly winds that originate from the northernmost Pacific across the Bering Strait and can reach as far as the western Canadian Arctic. These climate anomalies are associated with the PDO− (NPI+) phase and are key factors in enhancing evaporation and subsequent precipitation in this region of the Arctic. Collectively, the sedimentary evidence suggests that North Pacific climate variability has been a persistent regulator of the regional climate in the western Canadian Arctic. Since projected sea-ice loss will contribute to enhanced future warming in the Arctic, future negative phases of the PDO (or NPI+) will likely act to amplify this positive feedback. Text Arctic Bering Strait Sea ice Copernicus Publications: E-Journals Arctic Bering Strait Pacific Climate of the Past 13 4 411 420 |
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Open Polar |
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Copernicus Publications: E-Journals |
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English |
description |
Understanding how internal climate variability influences arctic regions is required to better forecast future global climate variations. This paper investigates an annually-laminated (varved) record from the western Canadian Arctic and finds that the varves are negatively correlated with both the instrumental Pacific Decadal Oscillation (PDO) during the past century and also with reconstructed PDO over the past 700 years, suggesting drier Arctic conditions during high-PDO phases, and vice versa. These results are in agreement with known regional teleconnections, whereby the PDO is negatively and positively correlated with summer precipitation and mean sea level pressure respectively. This pattern is also evident during the positive phase of the North Pacific Index (NPI) in autumn. Reduced sea-ice cover during summer–autumn is observed in the region during PDO− (NPI+) and is associated with low-level southerly winds that originate from the northernmost Pacific across the Bering Strait and can reach as far as the western Canadian Arctic. These climate anomalies are associated with the PDO− (NPI+) phase and are key factors in enhancing evaporation and subsequent precipitation in this region of the Arctic. Collectively, the sedimentary evidence suggests that North Pacific climate variability has been a persistent regulator of the regional climate in the western Canadian Arctic. Since projected sea-ice loss will contribute to enhanced future warming in the Arctic, future negative phases of the PDO (or NPI+) will likely act to amplify this positive feedback. |
format |
Text |
author |
Lapointe, François Francus, Pierre Lamoureux, Scott F. Vuille, Mathias Jenny, Jean-Philippe Bradley, Raymond S. Massa, Charly |
spellingShingle |
Lapointe, François Francus, Pierre Lamoureux, Scott F. Vuille, Mathias Jenny, Jean-Philippe Bradley, Raymond S. Massa, Charly Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
author_facet |
Lapointe, François Francus, Pierre Lamoureux, Scott F. Vuille, Mathias Jenny, Jean-Philippe Bradley, Raymond S. Massa, Charly |
author_sort |
Lapointe, François |
title |
Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
title_short |
Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
title_full |
Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
title_fullStr |
Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
title_full_unstemmed |
Influence of North Pacific decadal variability on the western Canadian Arctic over the past 700 years |
title_sort |
influence of north pacific decadal variability on the western canadian arctic over the past 700 years |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-13-411-2017 https://cp.copernicus.org/articles/13/411/2017/ |
geographic |
Arctic Bering Strait Pacific |
geographic_facet |
Arctic Bering Strait Pacific |
genre |
Arctic Bering Strait Sea ice |
genre_facet |
Arctic Bering Strait Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-13-411-2017 https://cp.copernicus.org/articles/13/411/2017/ |
op_doi |
https://doi.org/10.5194/cp-13-411-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
4 |
container_start_page |
411 |
op_container_end_page |
420 |
_version_ |
1766307382817718272 |