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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fttriple:oai:gotriple.eu:kN-L8tHkurjwVX913NPII 2023-05-15T16:22:37+02:00 Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures Sánchez-Montes, Maria Luisa McClymont, Erin L. Lloyd, Jeremy M. Müller, Juliane Cowan, Ellen A. Zorzi, Coralie 2020-02-14 https://doi.org/10.5194/cp-16-299-2020 https://cp.copernicus.org/articles/16/299/2020/ en eng doi:10.5194/cp-16-299-2020 10670/1.1t9qab https://cp.copernicus.org/articles/16/299/2020/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2020 fttriple https://doi.org/10.5194/cp-16-299-2020 2023-01-22T17:52:35Z 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. Text glaciers Ice Sheet Subarctic Alaska Unknown Gulf of Alaska Pacific Climate of the Past 16 1 299 313 |
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geo envir Sánchez-Montes, Maria Luisa McClymont, Erin L. Lloyd, Jeremy M. Müller, Juliane Cowan, Ellen A. Zorzi, Coralie Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures |
topic_facet |
geo envir |
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 |
Text |
author |
Sánchez-Montes, Maria Luisa McClymont, Erin L. Lloyd, Jeremy M. Müller, Juliane Cowan, Ellen A. Zorzi, Coralie |
author_facet |
Sánchez-Montes, Maria Luisa McClymont, Erin L. Lloyd, Jeremy M. Müller, Juliane Cowan, Ellen A. Zorzi, Coralie |
author_sort |
Sánchez-Montes, Maria Luisa |
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 |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-299-2020 https://cp.copernicus.org/articles/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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-16-299-2020 10670/1.1t9qab https://cp.copernicus.org/articles/16/299/2020/ |
op_rights |
undefined |
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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1766010619895480320 |