Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures.
The initiation and evolution of the Cordilleran Ice Sheet are relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses along...
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Copernicus Publications
2020
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Online Access: | http://dro.dur.ac.uk/30237/ http://dro.dur.ac.uk/30237/1/30237.pdf https://doi.org/10.5194/cp-16-299-2020 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:30237 2023-05-15T16:22:37+02:00 Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. Sánchez-Montes, M.L. McClymont, E.L. Lloyd, J.M. Müller, J. Cowan, E.A. Zorzi, C. de Vernal, A. 2020-02-14 application/pdf http://dro.dur.ac.uk/30237/ http://dro.dur.ac.uk/30237/1/30237.pdf https://doi.org/10.5194/cp-16-299-2020 unknown Copernicus Publications dro:30237 issn:1814-9324 issn: 1814-9332 doi:10.5194/cp-16-299-2020 http://dro.dur.ac.uk/30237/ https://doi.org/10.5194/cp-16-299-2020 http://dro.dur.ac.uk/30237/1/30237.pdf © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. CC-BY Climate of the past, 2020, Vol.16(1), pp.299-313 [Peer Reviewed Journal] Article PeerReviewed 2020 ftunivdurham https://doi.org/10.5194/cp-16-299-2020 2023-03-02T23:26:34Z The initiation and evolution of the Cordilleran Ice Sheet are relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses alongside ice-rafted debris (IRD), terrigenous, and marine organic matter inputs to the GOA through the late Pliocene and early Pleistocene. The first IRD contribution from tidewater glaciers in southwest Alaska is recorded at 2.9 Ma, indicating that the Cordilleran Ice Sheet extent increased in the late Pliocene. A higher occurrence of IRD and higher sedimentation rates in the GOA during the early Pleistocene, at 2.5 Ma, occur in synchrony with SSTs warming on the order of 1 ∘C relative to the Pliocene. All records show a high degree of variability in the early Pleistocene, indicating highly efficient ocean–climate–ice interactions through warm SST–ocean evaporation–orographic precipitation–ice growth mechanisms. A climatic shift towards ocean circulation in the subarctic Pacific similar to the pattern observed during negative Pacific Decadal Oscillation (PDO) conditions today occurs with the development of more extensive Cordilleran glaciation and may have played a role through increased moisture supply to the subarctic Pacific. The drop in atmospheric CO2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation. Article in Journal/Newspaper glaciers Ice Sheet Subarctic Alaska Durham University: Durham Research Online Gulf of Alaska Pacific Climate of the Past 16 1 299 313 |
institution |
Open Polar |
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Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
The initiation and evolution of the Cordilleran Ice Sheet are relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses alongside ice-rafted debris (IRD), terrigenous, and marine organic matter inputs to the GOA through the late Pliocene and early Pleistocene. The first IRD contribution from tidewater glaciers in southwest Alaska is recorded at 2.9 Ma, indicating that the Cordilleran Ice Sheet extent increased in the late Pliocene. A higher occurrence of IRD and higher sedimentation rates in the GOA during the early Pleistocene, at 2.5 Ma, occur in synchrony with SSTs warming on the order of 1 ∘C relative to the Pliocene. All records show a high degree of variability in the early Pleistocene, indicating highly efficient ocean–climate–ice interactions through warm SST–ocean evaporation–orographic precipitation–ice growth mechanisms. A climatic shift towards ocean circulation in the subarctic Pacific similar to the pattern observed during negative Pacific Decadal Oscillation (PDO) conditions today occurs with the development of more extensive Cordilleran glaciation and may have played a role through increased moisture supply to the subarctic Pacific. The drop in atmospheric CO2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation. |
format |
Article in Journal/Newspaper |
author |
Sánchez-Montes, M.L. McClymont, E.L. Lloyd, J.M. Müller, J. Cowan, E.A. Zorzi, C. de Vernal, A. |
spellingShingle |
Sánchez-Montes, M.L. McClymont, E.L. Lloyd, J.M. Müller, J. Cowan, E.A. Zorzi, C. de Vernal, A. Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
author_facet |
Sánchez-Montes, M.L. McClymont, E.L. Lloyd, J.M. Müller, J. Cowan, E.A. Zorzi, C. de Vernal, A. |
author_sort |
Sánchez-Montes, M.L. |
title |
Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
title_short |
Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
title_full |
Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
title_fullStr |
Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
title_full_unstemmed |
Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures. |
title_sort |
late pliocene cordilleran ice sheet development with warm northeast pacific sea surface temperatures. |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
http://dro.dur.ac.uk/30237/ http://dro.dur.ac.uk/30237/1/30237.pdf https://doi.org/10.5194/cp-16-299-2020 |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
glaciers Ice Sheet Subarctic Alaska |
genre_facet |
glaciers Ice Sheet Subarctic Alaska |
op_source |
Climate of the past, 2020, Vol.16(1), pp.299-313 [Peer Reviewed Journal] |
op_relation |
dro:30237 issn:1814-9324 issn: 1814-9332 doi:10.5194/cp-16-299-2020 http://dro.dur.ac.uk/30237/ https://doi.org/10.5194/cp-16-299-2020 http://dro.dur.ac.uk/30237/1/30237.pdf |
op_rights |
© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-16-299-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
1 |
container_start_page |
299 |
op_container_end_page |
313 |
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1766010619724562432 |