Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland
Two high-sediment-accumulation-rate Icelandic lakes, the glacial lake Hvítárvatn and the non-glaciallake Haukadalsvatn, contain numerous tephra layers of known age, which together with highresolutionpaleomagnetic secular variations allow synchronization with a well-dated marine core from the shelf n...
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/33817 2023-06-11T04:11:57+02:00 Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland Geirsdottir, A. Miller, Gifford Larsen, D. Olafsdottir, S. 2013 restricted https://hdl.handle.net/20.500.11937/33817 unknown Elsevier http://www.sciencedirect.com/science/article/pii/S0277379113001157 http://hdl.handle.net/20.500.11937/33817 8.2 Event Holocene paleoclimate Lake sediment Little Ice Age Thermal Maximum Medieval warm period Iceland Holocene Abrupt climate transitions Neoglaciation Journal Article 2013 ftcurtin https://doi.org/20.500.11937/33817 2023-05-30T19:37:51Z Two high-sediment-accumulation-rate Icelandic lakes, the glacial lake Hvítárvatn and the non-glaciallake Haukadalsvatn, contain numerous tephra layers of known age, which together with highresolutionpaleomagnetic secular variations allow synchronization with a well-dated marine core from the shelf north of Iceland. A composite standardized climate record from the two lakes provides a single time series that efficiently integrates multi-proxy data that reflect the evolution of summer temperaturesthrough the Holocene. The first-order trends in biogenic silica (BSi), d13C, and C:N rise relatively abruptly following deglaciation, reaching maximum values shortly after 8 ka following a complex minimum between 8.7 and 8.0 ka. The Holocene Thermal Maximum (HTM) in the lakes is marked by all proxies, with a sharp transition out of the 8 ka cold event into peak summer warmth by 7.9 ka, and continuing warm with some fluctuations until 5.5 ka. Decreasing summer insolation after the HTM is reflected by incremental cooling, initially w5.5 ka, with subsequent cold perturbations recorded by all proxies 4.3 to 4.0 ka and 3.1 to 2.8 ka. The strongest disturbance occurred after 2 ka with initial summer cooling occurring between 1.4 and 1.0 ka, followed by a more severe drop in summer temperatures after 0.7 ka culminating between 0.5 and 0.2 ka. Following each late Holocene cold departure, BSi re-equilibrated at a lower value independent of the sediment accumulation rate. Some of the abrupt shifts may be related to Icelandic volcanism influencing catchment stability, but the lack of a full recovery to pre-existing values after the perturbation suggests increased periglacial activity, decreased vegetation cover, and glacier growth in the highlands of Iceland. The similarity in timing, direction and magnitude of our multi-proxy records from glacial and non-glacial lakes, and from the adjacent marine shelf, suggests that our composite record reflects large-scale shifts in ocean/atmosphere circulation throughout the northern North ... Article in Journal/Newspaper glacier Iceland North Atlantic Curtin University: espace Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Haukadalsvatn ENVELOPE(-21.625,-21.625,65.054,65.054) Hvítárvatn ENVELOPE(-19.837,-19.837,64.612,64.612) |
institution |
Open Polar |
collection |
Curtin University: espace |
op_collection_id |
ftcurtin |
language |
unknown |
topic |
8.2 Event Holocene paleoclimate Lake sediment Little Ice Age Thermal Maximum Medieval warm period Iceland Holocene Abrupt climate transitions Neoglaciation |
spellingShingle |
8.2 Event Holocene paleoclimate Lake sediment Little Ice Age Thermal Maximum Medieval warm period Iceland Holocene Abrupt climate transitions Neoglaciation Geirsdottir, A. Miller, Gifford Larsen, D. Olafsdottir, S. Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
topic_facet |
8.2 Event Holocene paleoclimate Lake sediment Little Ice Age Thermal Maximum Medieval warm period Iceland Holocene Abrupt climate transitions Neoglaciation |
description |
Two high-sediment-accumulation-rate Icelandic lakes, the glacial lake Hvítárvatn and the non-glaciallake Haukadalsvatn, contain numerous tephra layers of known age, which together with highresolutionpaleomagnetic secular variations allow synchronization with a well-dated marine core from the shelf north of Iceland. A composite standardized climate record from the two lakes provides a single time series that efficiently integrates multi-proxy data that reflect the evolution of summer temperaturesthrough the Holocene. The first-order trends in biogenic silica (BSi), d13C, and C:N rise relatively abruptly following deglaciation, reaching maximum values shortly after 8 ka following a complex minimum between 8.7 and 8.0 ka. The Holocene Thermal Maximum (HTM) in the lakes is marked by all proxies, with a sharp transition out of the 8 ka cold event into peak summer warmth by 7.9 ka, and continuing warm with some fluctuations until 5.5 ka. Decreasing summer insolation after the HTM is reflected by incremental cooling, initially w5.5 ka, with subsequent cold perturbations recorded by all proxies 4.3 to 4.0 ka and 3.1 to 2.8 ka. The strongest disturbance occurred after 2 ka with initial summer cooling occurring between 1.4 and 1.0 ka, followed by a more severe drop in summer temperatures after 0.7 ka culminating between 0.5 and 0.2 ka. Following each late Holocene cold departure, BSi re-equilibrated at a lower value independent of the sediment accumulation rate. Some of the abrupt shifts may be related to Icelandic volcanism influencing catchment stability, but the lack of a full recovery to pre-existing values after the perturbation suggests increased periglacial activity, decreased vegetation cover, and glacier growth in the highlands of Iceland. The similarity in timing, direction and magnitude of our multi-proxy records from glacial and non-glacial lakes, and from the adjacent marine shelf, suggests that our composite record reflects large-scale shifts in ocean/atmosphere circulation throughout the northern North ... |
format |
Article in Journal/Newspaper |
author |
Geirsdottir, A. Miller, Gifford Larsen, D. Olafsdottir, S. |
author_facet |
Geirsdottir, A. Miller, Gifford Larsen, D. Olafsdottir, S. |
author_sort |
Geirsdottir, A. |
title |
Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
title_short |
Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
title_full |
Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
title_fullStr |
Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
title_full_unstemmed |
Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland |
title_sort |
abrupt holocene climate transitions in the northern north atlantic region recorded by synchronized lacustrine records in iceland |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://hdl.handle.net/20.500.11937/33817 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-21.625,-21.625,65.054,65.054) ENVELOPE(-19.837,-19.837,64.612,64.612) |
geographic |
Glacial Lake Haukadalsvatn Hvítárvatn |
geographic_facet |
Glacial Lake Haukadalsvatn Hvítárvatn |
genre |
glacier Iceland North Atlantic |
genre_facet |
glacier Iceland North Atlantic |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0277379113001157 http://hdl.handle.net/20.500.11937/33817 |
op_doi |
https://doi.org/20.500.11937/33817 |
_version_ |
1768387407666741248 |