Warming of surface waters in the mid-latitude North Atlantic during Heinrich events
During the six Heinrich events of the last 70 kyr, episodic calving from the circum-Atlantic ice sheets released large numbers of icebergs into the North Atlantic. These icebergs and associated meltwater flux are hypothesized to have led to a shutdown of Atlantic Meridional Overturning Circulation a...
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Online Access: | https://epic.awi.de/id/eprint/34349/ http://onlinelibrary.wiley.com/doi/10.1029/2012PA002354/abstract;jsessionid=DAA85C843639D7BBA18B6ECEA2479F5A.f03t02 https://hdl.handle.net/10013/epic.42644 |
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ftawi:oai:epic.awi.de:34349 2023-05-15T17:25:44+02:00 Warming of surface waters in the mid-latitude North Atlantic during Heinrich events Naafs, Bernhard David Adriaan Hefter, Jens Gruetzner, Jens Stein, Rüdiger 2013 https://epic.awi.de/id/eprint/34349/ http://onlinelibrary.wiley.com/doi/10.1029/2012PA002354/abstract;jsessionid=DAA85C843639D7BBA18B6ECEA2479F5A.f03t02 https://hdl.handle.net/10013/epic.42644 unknown AMER GEOPHYSICAL UNION Naafs, B. D. A. , Hefter, J. orcid:0000-0002-5823-1966 , Gruetzner, J. orcid:0000-0001-5445-2393 and Stein, R. orcid:0000-0002-4453-9564 (2013) Warming of surface waters in the mid-latitude North Atlantic during Heinrich events , Paleoceanography, 28 (1), pp. 153-163 . doi:10.1029/2012PA002354 <https://doi.org/10.1029/2012PA002354> , hdl:10013/epic.42644 EPIC3Paleoceanography, AMER GEOPHYSICAL UNION, 28(1), pp. 153-163, ISSN: 0883-8305 Article isiRev 2013 ftawi https://doi.org/10.1029/2012PA002354 2021-12-24T15:39:07Z During the six Heinrich events of the last 70 kyr, episodic calving from the circum-Atlantic ice sheets released large numbers of icebergs into the North Atlantic. These icebergs and associated meltwater flux are hypothesized to have led to a shutdown of Atlantic Meridional Overturning Circulation and severe cooling in large parts of the Northern Hemisphere. However, due to the limited availability of high-resolution records, the magnitude of sea surface temperature (SST) changes related to the impact of Heinrich events on the midlatitude North Atlantic is poorly constrained. Here we present a record of U37K′-based SSTs derived from sediments of Integrated Ocean Drilling Project Site U1313, located at the southern end of the ice-rafted debris (IRD) belt in the midlatitude North Atlantic (41°N). We demonstrate that all six Heinrich events are associated with a rapid warming of surface waters by 2–4°C in a few thousand years. The presence of IRD leaves no doubt about the simultaneous timing and correlation between rapid surface water warming and Heinrich events. We argue that this warming in the midlatitude North Atlantic is related to a northward expansion of the subtropical gyre during Heinrich events. As a wide range of studies demonstrated that in the central IRD belt Heinrich events are associated with low SSTs, these results thus identify an antiphased (seesaw) pattern in SSTs during Heinrich events between the midlatitude (warm) and northern North Atlantic (cold). This highlights the complex response of surface water characteristics in the North Atlantic to Heinrich events that is poorly reproduced by freshwater hosing experiments and challenges the widely accepted view that, within the IRD belt of the North Atlantic, Heinrich events coincide with periods of low SSTs. Article in Journal/Newspaper North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Paleoceanography 28 1 153 163 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
During the six Heinrich events of the last 70 kyr, episodic calving from the circum-Atlantic ice sheets released large numbers of icebergs into the North Atlantic. These icebergs and associated meltwater flux are hypothesized to have led to a shutdown of Atlantic Meridional Overturning Circulation and severe cooling in large parts of the Northern Hemisphere. However, due to the limited availability of high-resolution records, the magnitude of sea surface temperature (SST) changes related to the impact of Heinrich events on the midlatitude North Atlantic is poorly constrained. Here we present a record of U37K′-based SSTs derived from sediments of Integrated Ocean Drilling Project Site U1313, located at the southern end of the ice-rafted debris (IRD) belt in the midlatitude North Atlantic (41°N). We demonstrate that all six Heinrich events are associated with a rapid warming of surface waters by 2–4°C in a few thousand years. The presence of IRD leaves no doubt about the simultaneous timing and correlation between rapid surface water warming and Heinrich events. We argue that this warming in the midlatitude North Atlantic is related to a northward expansion of the subtropical gyre during Heinrich events. As a wide range of studies demonstrated that in the central IRD belt Heinrich events are associated with low SSTs, these results thus identify an antiphased (seesaw) pattern in SSTs during Heinrich events between the midlatitude (warm) and northern North Atlantic (cold). This highlights the complex response of surface water characteristics in the North Atlantic to Heinrich events that is poorly reproduced by freshwater hosing experiments and challenges the widely accepted view that, within the IRD belt of the North Atlantic, Heinrich events coincide with periods of low SSTs. |
format |
Article in Journal/Newspaper |
author |
Naafs, Bernhard David Adriaan Hefter, Jens Gruetzner, Jens Stein, Rüdiger |
spellingShingle |
Naafs, Bernhard David Adriaan Hefter, Jens Gruetzner, Jens Stein, Rüdiger Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
author_facet |
Naafs, Bernhard David Adriaan Hefter, Jens Gruetzner, Jens Stein, Rüdiger |
author_sort |
Naafs, Bernhard David Adriaan |
title |
Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
title_short |
Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
title_full |
Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
title_fullStr |
Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
title_full_unstemmed |
Warming of surface waters in the mid-latitude North Atlantic during Heinrich events |
title_sort |
warming of surface waters in the mid-latitude north atlantic during heinrich events |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/34349/ http://onlinelibrary.wiley.com/doi/10.1029/2012PA002354/abstract;jsessionid=DAA85C843639D7BBA18B6ECEA2479F5A.f03t02 https://hdl.handle.net/10013/epic.42644 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
EPIC3Paleoceanography, AMER GEOPHYSICAL UNION, 28(1), pp. 153-163, ISSN: 0883-8305 |
op_relation |
Naafs, B. D. A. , Hefter, J. orcid:0000-0002-5823-1966 , Gruetzner, J. orcid:0000-0001-5445-2393 and Stein, R. orcid:0000-0002-4453-9564 (2013) Warming of surface waters in the mid-latitude North Atlantic during Heinrich events , Paleoceanography, 28 (1), pp. 153-163 . doi:10.1029/2012PA002354 <https://doi.org/10.1029/2012PA002354> , hdl:10013/epic.42644 |
op_doi |
https://doi.org/10.1029/2012PA002354 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
1 |
container_start_page |
153 |
op_container_end_page |
163 |
_version_ |
1766117224233304064 |