Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals
The accelerating flux of glacial meltwater to the oceans due to global warming is a potential trigger for future climate disturbance. Past disruption of Atlantic Ocean circulation, driven by melting of land-based ice, is linked in models to reduced ocean-atmosphere heat transfer and abrupt cooling d...
Published in: | Journal of Geophysical Research: Earth Surface |
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Language: | English |
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John Wiley and Sons Inc.
2023
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/156131/ https://doi.org/10.1029/2022JF006951 https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:156131 2023-06-11T04:14:18+02:00 Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals Bromley, Gordon Putnam, Aaron Hall, Brenda Rademaker, Kurt Thomas, Holly Balter-Kennedy, Allie Barker, Stephen Rice, Donald 2023-01-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/156131/ https://doi.org/10.1029/2022JF006951 https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf en eng John Wiley and Sons Inc. https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf Bromley, Gordon, Putnam, Aaron, Hall, Brenda, Rademaker, Kurt, Thomas, Holly, Balter-Kennedy, Allie, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431 and Rice, Donald 2023. Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals. Journal of Geophysical Research. Earth Surface 128 (1) , e2022JF006951. 10.1029/2022JF006951 https://doi.org/10.1029/2022JF006951 file https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf doi:10.1029/2022JF006951 cc_by_4_0 Article PeerReviewed 2023 ftunivcardiff https://doi.org/10.1029/2022JF006951 2023-05-04T22:39:05Z The accelerating flux of glacial meltwater to the oceans due to global warming is a potential trigger for future climate disturbance. Past disruption of Atlantic Ocean circulation, driven by melting of land-based ice, is linked in models to reduced ocean-atmosphere heat transfer and abrupt cooling during stadial events. The most recent stadial, the Younger Dryas (YD), is traditionally viewed as a severe cooling centered on the North Atlantic but with hemispheric influence. However, indications of summer warmth question whether YD cooling was truly year-round or restricted to winter. Here, we present a beryllium-10-dated glacier record from the north-east North Atlantic, coupled with 2-D glacier-climate modeling, to reconstruct Lateglacial summer air temperature patterns. Our record reveals that, contrary to the prevailing model, the last glacial advance in Scotland did not occur during the YD but predated the stadial, while the YD itself was characterized by warming-driven deglaciation. We argue that these apparently paradoxical findings can be reconciled with regional and global climate events by invoking enhanced North Atlantic seasonality—with anomalously cold winters but warming summers—as an intrinsic response to globally increased poleward heat fluxes. Article in Journal/Newspaper North Atlantic Cardiff University: ORCA (Online Research @ Cardiff) Journal of Geophysical Research: Earth Surface 128 1 |
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Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
The accelerating flux of glacial meltwater to the oceans due to global warming is a potential trigger for future climate disturbance. Past disruption of Atlantic Ocean circulation, driven by melting of land-based ice, is linked in models to reduced ocean-atmosphere heat transfer and abrupt cooling during stadial events. The most recent stadial, the Younger Dryas (YD), is traditionally viewed as a severe cooling centered on the North Atlantic but with hemispheric influence. However, indications of summer warmth question whether YD cooling was truly year-round or restricted to winter. Here, we present a beryllium-10-dated glacier record from the north-east North Atlantic, coupled with 2-D glacier-climate modeling, to reconstruct Lateglacial summer air temperature patterns. Our record reveals that, contrary to the prevailing model, the last glacial advance in Scotland did not occur during the YD but predated the stadial, while the YD itself was characterized by warming-driven deglaciation. We argue that these apparently paradoxical findings can be reconciled with regional and global climate events by invoking enhanced North Atlantic seasonality—with anomalously cold winters but warming summers—as an intrinsic response to globally increased poleward heat fluxes. |
format |
Article in Journal/Newspaper |
author |
Bromley, Gordon Putnam, Aaron Hall, Brenda Rademaker, Kurt Thomas, Holly Balter-Kennedy, Allie Barker, Stephen Rice, Donald |
spellingShingle |
Bromley, Gordon Putnam, Aaron Hall, Brenda Rademaker, Kurt Thomas, Holly Balter-Kennedy, Allie Barker, Stephen Rice, Donald Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
author_facet |
Bromley, Gordon Putnam, Aaron Hall, Brenda Rademaker, Kurt Thomas, Holly Balter-Kennedy, Allie Barker, Stephen Rice, Donald |
author_sort |
Bromley, Gordon |
title |
Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
title_short |
Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
title_full |
Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
title_fullStr |
Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
title_full_unstemmed |
Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals |
title_sort |
lateglacial shifts in seasonality reconcile conflicting north atlantic temperature signals |
publisher |
John Wiley and Sons Inc. |
publishDate |
2023 |
url |
https://orca.cardiff.ac.uk/id/eprint/156131/ https://doi.org/10.1029/2022JF006951 https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf Bromley, Gordon, Putnam, Aaron, Hall, Brenda, Rademaker, Kurt, Thomas, Holly, Balter-Kennedy, Allie, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431 and Rice, Donald 2023. Lateglacial shifts in seasonality reconcile conflicting North Atlantic temperature signals. Journal of Geophysical Research. Earth Surface 128 (1) , e2022JF006951. 10.1029/2022JF006951 https://doi.org/10.1029/2022JF006951 file https://orca.cardiff.ac.uk/id/eprint/156131/1/BromleyG2023LateglacialShiftsJGR.pdf doi:10.1029/2022JF006951 |
op_rights |
cc_by_4_0 |
op_doi |
https://doi.org/10.1029/2022JF006951 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
128 |
container_issue |
1 |
_version_ |
1768392234788454400 |