Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae
The fast decline of Arctic sea ice is a leading indicator of ongoing global climate change and is receiving substantial public and scientific attention. Projections suggest that Arctic summer sea ice may virtually disappear within the course of the next 50 or even 30 yr with rapid Arctic warming. Ho...
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2019
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Online Access: | https://oceanrep.geomar.de/id/eprint/48115/ https://oceanrep.geomar.de/id/eprint/48115/1/Hetzinger%20et%20al.pdf https://doi.org/10.1130/G46507.1 |
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ftoceanrep:oai:oceanrep.geomar.de:48115 2023-05-15T14:25:29+02:00 Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae Hetzinger, Steffen Halfar, Jochen Zajacz, Zoltán Wisshak, Max 2019 text https://oceanrep.geomar.de/id/eprint/48115/ https://oceanrep.geomar.de/id/eprint/48115/1/Hetzinger%20et%20al.pdf https://doi.org/10.1130/G46507.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/48115/1/Hetzinger%20et%20al.pdf Hetzinger, S. , Halfar, J., Zajacz, Z. and Wisshak, M. (2019) Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae. Geology, 47 (10). pp. 963-967. DOI 10.1130/G46507.1 <https://doi.org/10.1130/G46507.1>. doi:10.1130/G46507.1 cc_by_4.0 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1130/G46507.1 2023-04-07T15:47:56Z The fast decline of Arctic sea ice is a leading indicator of ongoing global climate change and is receiving substantial public and scientific attention. Projections suggest that Arctic summer sea ice may virtually disappear within the course of the next 50 or even 30 yr with rapid Arctic warming. However, limited observational records and lack of annual-resolution marine sea-ice proxies hamper the assessment of long-term changes in sea ice, leading to large uncertainties in predictions of its future evolution under global warming. Here, we use long-lived encrusting coralline algae that strongly depend on light availability as a new in situ proxy to reconstruct past variability in the duration of seasonal sea-ice cover. Our data represent the northernmost annual-resolution marine sea-ice reconstruction to date, extending to the early 19th century off Svalbard. Algal records show that the decreasing trend in sea-ice cover in the high Arctic had already started at the beginning of the 20th century, earlier than previously reported from sea-ice reconstructions based on terrestrial archives. Our data further suggest that, although sea-ice extent varies on multidecadal time scales, the lowest sea-ice values within the past 200 yr occurred at the end of the 20th century. Article in Journal/Newspaper Arctic Arctic Climate change Global warming Sea ice Svalbard OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Svalbard Geology 47 10 963 967 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The fast decline of Arctic sea ice is a leading indicator of ongoing global climate change and is receiving substantial public and scientific attention. Projections suggest that Arctic summer sea ice may virtually disappear within the course of the next 50 or even 30 yr with rapid Arctic warming. However, limited observational records and lack of annual-resolution marine sea-ice proxies hamper the assessment of long-term changes in sea ice, leading to large uncertainties in predictions of its future evolution under global warming. Here, we use long-lived encrusting coralline algae that strongly depend on light availability as a new in situ proxy to reconstruct past variability in the duration of seasonal sea-ice cover. Our data represent the northernmost annual-resolution marine sea-ice reconstruction to date, extending to the early 19th century off Svalbard. Algal records show that the decreasing trend in sea-ice cover in the high Arctic had already started at the beginning of the 20th century, earlier than previously reported from sea-ice reconstructions based on terrestrial archives. Our data further suggest that, although sea-ice extent varies on multidecadal time scales, the lowest sea-ice values within the past 200 yr occurred at the end of the 20th century. |
format |
Article in Journal/Newspaper |
author |
Hetzinger, Steffen Halfar, Jochen Zajacz, Zoltán Wisshak, Max |
spellingShingle |
Hetzinger, Steffen Halfar, Jochen Zajacz, Zoltán Wisshak, Max Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
author_facet |
Hetzinger, Steffen Halfar, Jochen Zajacz, Zoltán Wisshak, Max |
author_sort |
Hetzinger, Steffen |
title |
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
title_short |
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
title_full |
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
title_fullStr |
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
title_full_unstemmed |
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae |
title_sort |
early start of 20th-century arctic sea-ice decline recorded in svalbard coralline algae |
publisher |
GSA (Geological Society of America) |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/48115/ https://oceanrep.geomar.de/id/eprint/48115/1/Hetzinger%20et%20al.pdf https://doi.org/10.1130/G46507.1 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic Climate change Global warming Sea ice Svalbard |
genre_facet |
Arctic Arctic Climate change Global warming Sea ice Svalbard |
op_relation |
https://oceanrep.geomar.de/id/eprint/48115/1/Hetzinger%20et%20al.pdf Hetzinger, S. , Halfar, J., Zajacz, Z. and Wisshak, M. (2019) Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae. Geology, 47 (10). pp. 963-967. DOI 10.1130/G46507.1 <https://doi.org/10.1130/G46507.1>. doi:10.1130/G46507.1 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G46507.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
10 |
container_start_page |
963 |
op_container_end_page |
967 |
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1766297865656729600 |