Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation
During the last glacial termination, the upper North Pacific Ocean underwent dramatic and rapid changes in oxygenation that lead to the transient intensification of oxygen minimum zones (OMZs), recorded by the widespread occurrence of laminated sediments on circum-Pacific continental margins. We pre...
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Online Access: | https://doi.org/10.5194/cp-10-2215-2014 https://cp.copernicus.org/articles/10/2215/2014/ |
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fttriple:oai:gotriple.eu:zPdjHpG-Jq5Zo_zEMdT4y 2023-05-15T15:43:21+02:00 Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation Kuehn, H. Lembke-Jene, L. Gersonde, R. Esper, O. Lamy, F. Arz, H. Kuhn, G. Tiedemann, R. 2018-09-27 https://doi.org/10.5194/cp-10-2215-2014 https://cp.copernicus.org/articles/10/2215/2014/ en eng Copernicus Publications doi:10.5194/cp-10-2215-2014 10670/1.8dz8fp 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/2215/2014/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-10-2215-2014 2023-01-22T18:11:52Z During the last glacial termination, the upper North Pacific Ocean underwent dramatic and rapid changes in oxygenation that lead to the transient intensification of oxygen minimum zones (OMZs), recorded by the widespread occurrence of laminated sediments on circum-Pacific continental margins. We present a new laminated sediment record from the mid-depth (1100 m) northern Bering Sea margin that provides insight into these deglacial OMZ maxima with exceptional, decadal-scale detail. Combined ultrahigh-resolution micro-X-ray-fluorescence (micro-XRF) data and sediment facies analysis of laminae reveal an alternation between predominantly terrigenous and diatom-dominated opal sedimentation. The diatomaceous laminae are interpreted to represent spring/summer productivity events related to the retreating sea ice margin. We identified five laminated sections in the deglacial part of our site. Lamina counts were carried out on these sections and correlated with the Bølling–Allerød and Preboreal phases in the North Greenland Ice Core (NGRIP) oxygen isotope record, indicating an annual deposition of individual lamina couplets (varves). The observed rapid decadal intensifications of anoxia, in particular within the Bølling–Allerød, are tightly coupled to short-term warm events through increases in regional export production. This dependence of laminae formation on warmer temperatures is underlined by a correlation with published Bering Sea sea surface temperature records and δ18O data of planktic foraminifera from the Gulf of Alaska. The rapidity of the observed changes strongly implies a close atmospheric teleconnection between North Pacific and North Atlantic regions. We suggest that concomitant increases in export production and subsequent remineralization of organic matter in the Bering Sea, in combination with oxygen-poor waters entering the Being Sea, drove down oxygen concentrations to values below 0.1 mL L−1 and caused laminae preservation. Calculated benthic–planktic ventilation ages show no significant variations ... Article in Journal/Newspaper Bering Sea Greenland Greenland ice core ice core NGRIP North Atlantic North Greenland Sea ice Alaska Unknown Bering Sea Greenland Gulf of Alaska Pacific Climate of the Past 10 6 2215 2236 |
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geo envir Kuehn, H. Lembke-Jene, L. Gersonde, R. Esper, O. Lamy, F. Arz, H. Kuhn, G. Tiedemann, R. Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
topic_facet |
geo envir |
description |
During the last glacial termination, the upper North Pacific Ocean underwent dramatic and rapid changes in oxygenation that lead to the transient intensification of oxygen minimum zones (OMZs), recorded by the widespread occurrence of laminated sediments on circum-Pacific continental margins. We present a new laminated sediment record from the mid-depth (1100 m) northern Bering Sea margin that provides insight into these deglacial OMZ maxima with exceptional, decadal-scale detail. Combined ultrahigh-resolution micro-X-ray-fluorescence (micro-XRF) data and sediment facies analysis of laminae reveal an alternation between predominantly terrigenous and diatom-dominated opal sedimentation. The diatomaceous laminae are interpreted to represent spring/summer productivity events related to the retreating sea ice margin. We identified five laminated sections in the deglacial part of our site. Lamina counts were carried out on these sections and correlated with the Bølling–Allerød and Preboreal phases in the North Greenland Ice Core (NGRIP) oxygen isotope record, indicating an annual deposition of individual lamina couplets (varves). The observed rapid decadal intensifications of anoxia, in particular within the Bølling–Allerød, are tightly coupled to short-term warm events through increases in regional export production. This dependence of laminae formation on warmer temperatures is underlined by a correlation with published Bering Sea sea surface temperature records and δ18O data of planktic foraminifera from the Gulf of Alaska. The rapidity of the observed changes strongly implies a close atmospheric teleconnection between North Pacific and North Atlantic regions. We suggest that concomitant increases in export production and subsequent remineralization of organic matter in the Bering Sea, in combination with oxygen-poor waters entering the Being Sea, drove down oxygen concentrations to values below 0.1 mL L−1 and caused laminae preservation. Calculated benthic–planktic ventilation ages show no significant variations ... |
format |
Article in Journal/Newspaper |
author |
Kuehn, H. Lembke-Jene, L. Gersonde, R. Esper, O. Lamy, F. Arz, H. Kuhn, G. Tiedemann, R. |
author_facet |
Kuehn, H. Lembke-Jene, L. Gersonde, R. Esper, O. Lamy, F. Arz, H. Kuhn, G. Tiedemann, R. |
author_sort |
Kuehn, H. |
title |
Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
title_short |
Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
title_full |
Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
title_fullStr |
Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
title_full_unstemmed |
Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation |
title_sort |
laminated sediments in the bering sea reveal atmospheric teleconnections to greenland climate on millennial to decadal timescales during the last deglaciation |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-10-2215-2014 https://cp.copernicus.org/articles/10/2215/2014/ |
geographic |
Bering Sea Greenland Gulf of Alaska Pacific |
geographic_facet |
Bering Sea Greenland Gulf of Alaska Pacific |
genre |
Bering Sea Greenland Greenland ice core ice core NGRIP North Atlantic North Greenland Sea ice Alaska |
genre_facet |
Bering Sea Greenland Greenland ice core ice core NGRIP North Atlantic North Greenland Sea ice Alaska |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-10-2215-2014 10670/1.8dz8fp 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/2215/2014/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-10-2215-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
6 |
container_start_page |
2215 |
op_container_end_page |
2236 |
_version_ |
1766377441404649472 |