Rapid shifts in subarctic Pacific climate between 138 and 70 ka
During the past decades, remarkable changes in sea-surface temperature (SST) and sea-ice extent have been observed in the marginal seas of the subarctic Pacific. However, little is known about natural climate variability at millennial time scales far beyond instrumental observations. Geological prox...
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2014
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ftoceanrep:oai:oceanrep.geomar.de:26434 2023-05-15T16:29:34+02:00 Rapid shifts in subarctic Pacific climate between 138 and 70 ka Max, L. Belz, L. Tiedemann, Ralf Fahl, Kirsten Nürnberg, Dirk Riethdorf, Jan-Rainer 2014-10 text https://oceanrep.geomar.de/id/eprint/26434/ https://oceanrep.geomar.de/id/eprint/26434/1/Max%20et.al.pdf https://doi.org/10.1130/G35879.1 en eng GSA, Geological Society of America https://oceanrep.geomar.de/id/eprint/26434/1/Max%20et.al.pdf Max, L., Belz, L., Tiedemann, R., Fahl, K., Nürnberg, D. and Riethdorf, J. R. (2014) Rapid shifts in subarctic Pacific climate between 138 and 70 ka. Geology, 42 (10). pp. 899-902. DOI 10.1130/G35879.1 <https://doi.org/10.1130/G35879.1>. doi:10.1130/G35879.1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2014 ftoceanrep https://doi.org/10.1130/G35879.1 2023-04-07T15:15:53Z During the past decades, remarkable changes in sea-surface temperature (SST) and sea-ice extent have been observed in the marginal seas of the subarctic Pacific. However, little is known about natural climate variability at millennial time scales far beyond instrumental observations. Geological proxy records, such as those derived from marine sediments, offer a unique opportunity to investigate millennial-scale natural climate variability of the Artic and subarctic environments during past glacial-interglacial cycles. Here we provide reconstructions of sea-ice variability inferred from IP25 (Ice Proxy with 25 carbon atoms) sea-ice biomarker and SST fluctuations based on alkenone unsaturation index (Graphic) of the subarctic Pacific realm between 138 and 70 ka. Warmest sea-surface conditions were found during the early Eemian interglacial (128 to 126 ka), exceeding modern SSTs by ∼2 °C. The further North Pacific climate evolution is marked by pronounced oscillations in SST and sea-ice extent on millennial time scales, which correspond remarkably well to short-term temperature oscillations known from Greenland and the North Atlantic. These results imply a common forcing, which seems to be closely coupled to dynamics of the Atlantic meridional overturning circulation. However, immediate propagation of such climate fluctuations far beyond the North Atlantic basin suggests a rapid circumpolar coupling mechanism probably acting through the atmosphere, a prerequisite to explain the apparent synchronicity of remote climatic reorganizations in the subarctic Pacific. Article in Journal/Newspaper Greenland North Atlantic Sea ice Subarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Pacific Geology 42 10 899 902 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
During the past decades, remarkable changes in sea-surface temperature (SST) and sea-ice extent have been observed in the marginal seas of the subarctic Pacific. However, little is known about natural climate variability at millennial time scales far beyond instrumental observations. Geological proxy records, such as those derived from marine sediments, offer a unique opportunity to investigate millennial-scale natural climate variability of the Artic and subarctic environments during past glacial-interglacial cycles. Here we provide reconstructions of sea-ice variability inferred from IP25 (Ice Proxy with 25 carbon atoms) sea-ice biomarker and SST fluctuations based on alkenone unsaturation index (Graphic) of the subarctic Pacific realm between 138 and 70 ka. Warmest sea-surface conditions were found during the early Eemian interglacial (128 to 126 ka), exceeding modern SSTs by ∼2 °C. The further North Pacific climate evolution is marked by pronounced oscillations in SST and sea-ice extent on millennial time scales, which correspond remarkably well to short-term temperature oscillations known from Greenland and the North Atlantic. These results imply a common forcing, which seems to be closely coupled to dynamics of the Atlantic meridional overturning circulation. However, immediate propagation of such climate fluctuations far beyond the North Atlantic basin suggests a rapid circumpolar coupling mechanism probably acting through the atmosphere, a prerequisite to explain the apparent synchronicity of remote climatic reorganizations in the subarctic Pacific. |
format |
Article in Journal/Newspaper |
author |
Max, L. Belz, L. Tiedemann, Ralf Fahl, Kirsten Nürnberg, Dirk Riethdorf, Jan-Rainer |
spellingShingle |
Max, L. Belz, L. Tiedemann, Ralf Fahl, Kirsten Nürnberg, Dirk Riethdorf, Jan-Rainer Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
author_facet |
Max, L. Belz, L. Tiedemann, Ralf Fahl, Kirsten Nürnberg, Dirk Riethdorf, Jan-Rainer |
author_sort |
Max, L. |
title |
Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
title_short |
Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
title_full |
Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
title_fullStr |
Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
title_full_unstemmed |
Rapid shifts in subarctic Pacific climate between 138 and 70 ka |
title_sort |
rapid shifts in subarctic pacific climate between 138 and 70 ka |
publisher |
GSA, Geological Society of America |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/26434/ https://oceanrep.geomar.de/id/eprint/26434/1/Max%20et.al.pdf https://doi.org/10.1130/G35879.1 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland North Atlantic Sea ice Subarctic |
genre_facet |
Greenland North Atlantic Sea ice Subarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/26434/1/Max%20et.al.pdf Max, L., Belz, L., Tiedemann, R., Fahl, K., Nürnberg, D. and Riethdorf, J. R. (2014) Rapid shifts in subarctic Pacific climate between 138 and 70 ka. Geology, 42 (10). pp. 899-902. DOI 10.1130/G35879.1 <https://doi.org/10.1130/G35879.1>. doi:10.1130/G35879.1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G35879.1 |
container_title |
Geology |
container_volume |
42 |
container_issue |
10 |
container_start_page |
899 |
op_container_end_page |
902 |
_version_ |
1766019281000071168 |