Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100
Waxing/waning of the ice sheets and the associated change in thermohaline circulation have played an important role in global climate change since major continental ice sheets appeared in the northern hemisphere about 2.75 million years ago. In the earliest glacial stages, however, establishment of...
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ftdoajarticles:oai:doaj.org/article:1594c4a7a63d4ccfa269221eb0d9323d 2023-05-15T16:40:27+02:00 Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 Masao eOhno Tatsuya eHayashi Masahiko eSato Yoshihiro eKuwahara Asami eMizuta Itsuro eKita Tokiyuki eSato Akihiro eKano 2016-05-01T00:00:00Z https://doi.org/10.3389/feart.2016.00055 https://doaj.org/article/1594c4a7a63d4ccfa269221eb0d9323d EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/feart.2016.00055/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2016.00055 https://doaj.org/article/1594c4a7a63d4ccfa269221eb0d9323d Frontiers in Earth Science, Vol 4 (2016) rock magnetism Integrated Ocean Drilling Program Early pleistocene Ice-rafted debris North Atlantic Deep Water Science Q article 2016 ftdoajarticles https://doi.org/10.3389/feart.2016.00055 2022-12-31T14:42:50Z Waxing/waning of the ice sheets and the associated change in thermohaline circulation have played an important role in global climate change since major continental ice sheets appeared in the northern hemisphere about 2.75 million years ago. In the earliest glacial stages, however, establishment of the linkage between ice sheet development and ocean circulation remain largely unclear. Here we show new high-resolution records of marine isotope stage 100 recovered from deep-sea sediments on the Gardar Drift, in the subpolar North Atlantic. Results of a wide range of analyses clearly reveal the influence of millennial-scale variability in iceberg discharge on ocean surface condition and bottom current variability in the subpolar North Atlantic during marine isotope stage 100. We identified eight events of ice-rafted debris, which occurred mostly with decreases in sea surface temperature and in current components indicating North Atlantic Deep Water. These decreases are interpreted by weakened deep water formation linked to iceberg discharge, similarly to observations from the last glacial period. Dolomite fraction of the ice-rafted events in early MIS 100 like the last glacial Heinrich events suggests massive collapse of the Laurentide ice sheet in North America. At the same time, our early glacial data suggest differences from the last glacial period: absence of 1470-year periodicity in the interactions between ice sheets and ocean, and northerly shift of the ice-rafted debris belt. Our high-resolution data largely improve the picture of ice-sheet/ocean interactions on millennial time scales in the early glacial period after major Northern Hemisphere glaciation. Article in Journal/Newspaper Ice Sheet North Atlantic Deep Water North Atlantic Directory of Open Access Journals: DOAJ Articles Frontiers in Earth Science 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
rock magnetism Integrated Ocean Drilling Program Early pleistocene Ice-rafted debris North Atlantic Deep Water Science Q |
spellingShingle |
rock magnetism Integrated Ocean Drilling Program Early pleistocene Ice-rafted debris North Atlantic Deep Water Science Q Masao eOhno Tatsuya eHayashi Masahiko eSato Yoshihiro eKuwahara Asami eMizuta Itsuro eKita Tokiyuki eSato Akihiro eKano Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
topic_facet |
rock magnetism Integrated Ocean Drilling Program Early pleistocene Ice-rafted debris North Atlantic Deep Water Science Q |
description |
Waxing/waning of the ice sheets and the associated change in thermohaline circulation have played an important role in global climate change since major continental ice sheets appeared in the northern hemisphere about 2.75 million years ago. In the earliest glacial stages, however, establishment of the linkage between ice sheet development and ocean circulation remain largely unclear. Here we show new high-resolution records of marine isotope stage 100 recovered from deep-sea sediments on the Gardar Drift, in the subpolar North Atlantic. Results of a wide range of analyses clearly reveal the influence of millennial-scale variability in iceberg discharge on ocean surface condition and bottom current variability in the subpolar North Atlantic during marine isotope stage 100. We identified eight events of ice-rafted debris, which occurred mostly with decreases in sea surface temperature and in current components indicating North Atlantic Deep Water. These decreases are interpreted by weakened deep water formation linked to iceberg discharge, similarly to observations from the last glacial period. Dolomite fraction of the ice-rafted events in early MIS 100 like the last glacial Heinrich events suggests massive collapse of the Laurentide ice sheet in North America. At the same time, our early glacial data suggest differences from the last glacial period: absence of 1470-year periodicity in the interactions between ice sheets and ocean, and northerly shift of the ice-rafted debris belt. Our high-resolution data largely improve the picture of ice-sheet/ocean interactions on millennial time scales in the early glacial period after major Northern Hemisphere glaciation. |
format |
Article in Journal/Newspaper |
author |
Masao eOhno Tatsuya eHayashi Masahiko eSato Yoshihiro eKuwahara Asami eMizuta Itsuro eKita Tokiyuki eSato Akihiro eKano |
author_facet |
Masao eOhno Tatsuya eHayashi Masahiko eSato Yoshihiro eKuwahara Asami eMizuta Itsuro eKita Tokiyuki eSato Akihiro eKano |
author_sort |
Masao eOhno |
title |
Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
title_short |
Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
title_full |
Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
title_fullStr |
Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
title_full_unstemmed |
Millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
title_sort |
millennial-scale interaction between ice sheets and ocean circulation during marine isotope stage 100 |
publisher |
Frontiers Media S.A. |
publishDate |
2016 |
url |
https://doi.org/10.3389/feart.2016.00055 https://doaj.org/article/1594c4a7a63d4ccfa269221eb0d9323d |
genre |
Ice Sheet North Atlantic Deep Water North Atlantic |
genre_facet |
Ice Sheet North Atlantic Deep Water North Atlantic |
op_source |
Frontiers in Earth Science, Vol 4 (2016) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/feart.2016.00055/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2016.00055 https://doaj.org/article/1594c4a7a63d4ccfa269221eb0d9323d |
op_doi |
https://doi.org/10.3389/feart.2016.00055 |
container_title |
Frontiers in Earth Science |
container_volume |
4 |
_version_ |
1766030845939810304 |