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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ftdoajarticles:oai:doaj.org/article:25688240b1d14879a8283c6146a8bb08 2023-05-15T16:22:37+02:00 Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures M. L. Sánchez-Montes E. L. McClymont J. M. Lloyd J. Müller E. A. Cowan C. Zorzi 2020-02-01T00:00:00Z https://doi.org/10.5194/cp-16-299-2020 https://doaj.org/article/25688240b1d14879a8283c6146a8bb08 EN eng Copernicus Publications https://www.clim-past.net/16/299/2020/cp-16-299-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-299-2020 1814-9324 1814-9332 https://doaj.org/article/25688240b1d14879a8283c6146a8bb08 Climate of the Past, Vol 16, Pp 299-313 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-299-2020 2022-12-31T06:18:15Z 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 CO 2 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 Directory of Open Access Journals: DOAJ Articles Gulf of Alaska Pacific Climate of the Past 16 1 299 313 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. L. Sánchez-Montes E. L. McClymont J. M. Lloyd J. Müller E. A. Cowan C. Zorzi Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 CO 2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation. |
format |
Article in Journal/Newspaper |
author |
M. L. Sánchez-Montes E. L. McClymont J. M. Lloyd J. Müller E. A. Cowan C. Zorzi |
author_facet |
M. L. Sánchez-Montes E. L. McClymont J. M. Lloyd J. Müller E. A. Cowan C. Zorzi |
author_sort |
M. L. Sánchez-Montes |
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 |
https://doi.org/10.5194/cp-16-299-2020 https://doaj.org/article/25688240b1d14879a8283c6146a8bb08 |
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, Vol 16, Pp 299-313 (2020) |
op_relation |
https://www.clim-past.net/16/299/2020/cp-16-299-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-299-2020 1814-9324 1814-9332 https://doaj.org/article/25688240b1d14879a8283c6146a8bb08 |
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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1766010625578762240 |