Icebergs not the trigger for North Atlantic cold events
Abrupt climate change is a ubiquitous feature of the Late Pleistocene epoch1. In particular, the sequence of Dansgaard–Oeschger events (repeated transitions between warm interstadial and cold stadial conditions), as recorded by ice cores in Greenland2, are thought to be linked to changes in the mode...
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:72388 2023-05-15T16:00:04+02:00 Icebergs not the trigger for North Atlantic cold events Barker, Stephen Chen, James Gong, Xun Jonkers, Lukas Knorr, Gregor Thornalley, David 2015-04-16 application/pdf https://orca.cardiff.ac.uk/id/eprint/72388/ https://doi.org/10.1038/nature14330 https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf en eng Nature Research https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Chen, James, Gong, Xun https://orca.cardiff.ac.uk/view/cardiffauthors/A12312152.html orcid:0000-0001-9308-4431 orcid:0000-0001-9308-4431, Jonkers, Lukas https://orca.cardiff.ac.uk/view/cardiffauthors/A642653Q.html orcid:0000-0002-0253-2639 orcid:0000-0002-0253-2639, Knorr, Gregor https://orca.cardiff.ac.uk/view/cardiffauthors/A023108P.html and Thornalley, David 2015. Icebergs not the trigger for North Atlantic cold events. Nature 520 (7547) , pp. 333-336. 10.1038/nature14330 https://doi.org/10.1038/nature14330 file https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf doi:10.1038/nature14330 Article PeerReviewed 2015 ftunivcardiff https://doi.org/10.1038/nature14330 2022-11-03T23:32:35Z Abrupt climate change is a ubiquitous feature of the Late Pleistocene epoch1. In particular, the sequence of Dansgaard–Oeschger events (repeated transitions between warm interstadial and cold stadial conditions), as recorded by ice cores in Greenland2, are thought to be linked to changes in the mode of overturning circulation in the Atlantic Ocean3. Moreover, the observed correspondence between North Atlantic cold events and increased iceberg calving and dispersal from ice sheets surrounding the North Atlantic4 has inspired many ocean and climate modelling studies that make use of freshwater forcing scenarios to simulate abrupt change across the North Atlantic region and beyond5, 6, 7. On the other hand, previous studies4, 8 identified an apparent lag between North Atlantic cooling events and the appearance of ice-rafted debris over the last glacial cycle, leading to the hypothesis that iceberg discharge may be a consequence of stadial conditions rather than the cause4, 9, 10, 11. Here we further establish this relationship and demonstrate a systematic delay between pronounced surface cooling and the arrival of ice-rafted debris at a site southwest of Iceland over the past four glacial cycles, implying that in general icebergs arrived too late to have triggered cooling. Instead we suggest that—on the basis of our comparisons of ice-rafted debris and polar planktonic foraminifera—abrupt transitions to stadial conditions should be considered as a nonlinear response to more gradual cooling across the North Atlantic. Although the freshwater derived from melting icebergs may provide a positive feedback for enhancing and or prolonging stadial conditions10, 11, it does not trigger northern stadial events. Article in Journal/Newspaper Dansgaard-Oeschger events Iceland North Atlantic Planktonic foraminifera Cardiff University: ORCA (Online Research @ Cardiff) Nature 520 7547 333 336 |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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ftunivcardiff |
language |
English |
description |
Abrupt climate change is a ubiquitous feature of the Late Pleistocene epoch1. In particular, the sequence of Dansgaard–Oeschger events (repeated transitions between warm interstadial and cold stadial conditions), as recorded by ice cores in Greenland2, are thought to be linked to changes in the mode of overturning circulation in the Atlantic Ocean3. Moreover, the observed correspondence between North Atlantic cold events and increased iceberg calving and dispersal from ice sheets surrounding the North Atlantic4 has inspired many ocean and climate modelling studies that make use of freshwater forcing scenarios to simulate abrupt change across the North Atlantic region and beyond5, 6, 7. On the other hand, previous studies4, 8 identified an apparent lag between North Atlantic cooling events and the appearance of ice-rafted debris over the last glacial cycle, leading to the hypothesis that iceberg discharge may be a consequence of stadial conditions rather than the cause4, 9, 10, 11. Here we further establish this relationship and demonstrate a systematic delay between pronounced surface cooling and the arrival of ice-rafted debris at a site southwest of Iceland over the past four glacial cycles, implying that in general icebergs arrived too late to have triggered cooling. Instead we suggest that—on the basis of our comparisons of ice-rafted debris and polar planktonic foraminifera—abrupt transitions to stadial conditions should be considered as a nonlinear response to more gradual cooling across the North Atlantic. Although the freshwater derived from melting icebergs may provide a positive feedback for enhancing and or prolonging stadial conditions10, 11, it does not trigger northern stadial events. |
format |
Article in Journal/Newspaper |
author |
Barker, Stephen Chen, James Gong, Xun Jonkers, Lukas Knorr, Gregor Thornalley, David |
spellingShingle |
Barker, Stephen Chen, James Gong, Xun Jonkers, Lukas Knorr, Gregor Thornalley, David Icebergs not the trigger for North Atlantic cold events |
author_facet |
Barker, Stephen Chen, James Gong, Xun Jonkers, Lukas Knorr, Gregor Thornalley, David |
author_sort |
Barker, Stephen |
title |
Icebergs not the trigger for North Atlantic cold events |
title_short |
Icebergs not the trigger for North Atlantic cold events |
title_full |
Icebergs not the trigger for North Atlantic cold events |
title_fullStr |
Icebergs not the trigger for North Atlantic cold events |
title_full_unstemmed |
Icebergs not the trigger for North Atlantic cold events |
title_sort |
icebergs not the trigger for north atlantic cold events |
publisher |
Nature Research |
publishDate |
2015 |
url |
https://orca.cardiff.ac.uk/id/eprint/72388/ https://doi.org/10.1038/nature14330 https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf |
genre |
Dansgaard-Oeschger events Iceland North Atlantic Planktonic foraminifera |
genre_facet |
Dansgaard-Oeschger events Iceland North Atlantic Planktonic foraminifera |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Chen, James, Gong, Xun https://orca.cardiff.ac.uk/view/cardiffauthors/A12312152.html orcid:0000-0001-9308-4431 orcid:0000-0001-9308-4431, Jonkers, Lukas https://orca.cardiff.ac.uk/view/cardiffauthors/A642653Q.html orcid:0000-0002-0253-2639 orcid:0000-0002-0253-2639, Knorr, Gregor https://orca.cardiff.ac.uk/view/cardiffauthors/A023108P.html and Thornalley, David 2015. Icebergs not the trigger for North Atlantic cold events. Nature 520 (7547) , pp. 333-336. 10.1038/nature14330 https://doi.org/10.1038/nature14330 file https://orca.cardiff.ac.uk/id/eprint/72388/1/255321_2_high_res_merged_1422011316.pdf doi:10.1038/nature14330 |
op_doi |
https://doi.org/10.1038/nature14330 |
container_title |
Nature |
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520 |
container_issue |
7547 |
container_start_page |
333 |
op_container_end_page |
336 |
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1766395941113298944 |