Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations
Using the climate model MIROC4m, we simulate self-sustained oscillations of millennial- scale periodicity in the climate and Atlantic meridional overturning circulation under glacial conditions. We show two cases of extreme climatic precession and examine the mechanism of these oscillations. When th...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020676 2023-07-23T04:20:38+02:00 Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations Kuniyoshi, Y. Abe-Ouchi, A. Sherriff-Tadano, S. Chan, W. Saito, F. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020676 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3869 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020676 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3869 2023-07-02T23:40:07Z Using the climate model MIROC4m, we simulate self-sustained oscillations of millennial- scale periodicity in the climate and Atlantic meridional overturning circulation under glacial conditions. We show two cases of extreme climatic precession and examine the mechanism of these oscillations. When the climatic precession corresponds to strong (weak) boreal seasonality, the period of the oscillation is about 1,500 (3,000) years. During the stadial, hot (cool) summer conditions in the Northern Hemisphere contribute to thin (thick) sea ice, which covers the deep convection sites, triggering early (late) abrupt climate change. During the interstadial, as sea ice is thin (thick), cold deep-water forms and cools the subsurface quickly (slowly), which influences the stratification of the North Atlantic Ocean. We show that the oscillations are explained by the internal feedbacks of the atmosphere-sea ice-ocean system, especially subsurface ocean temperature change and salt advection feedback with a positive feedback between the subpolar gyre and deep convection. Conference Object North Atlantic Sea ice GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Using the climate model MIROC4m, we simulate self-sustained oscillations of millennial- scale periodicity in the climate and Atlantic meridional overturning circulation under glacial conditions. We show two cases of extreme climatic precession and examine the mechanism of these oscillations. When the climatic precession corresponds to strong (weak) boreal seasonality, the period of the oscillation is about 1,500 (3,000) years. During the stadial, hot (cool) summer conditions in the Northern Hemisphere contribute to thin (thick) sea ice, which covers the deep convection sites, triggering early (late) abrupt climate change. During the interstadial, as sea ice is thin (thick), cold deep-water forms and cools the subsurface quickly (slowly), which influences the stratification of the North Atlantic Ocean. We show that the oscillations are explained by the internal feedbacks of the atmosphere-sea ice-ocean system, especially subsurface ocean temperature change and salt advection feedback with a positive feedback between the subpolar gyre and deep convection. |
format |
Conference Object |
author |
Kuniyoshi, Y. Abe-Ouchi, A. Sherriff-Tadano, S. Chan, W. Saito, F. |
spellingShingle |
Kuniyoshi, Y. Abe-Ouchi, A. Sherriff-Tadano, S. Chan, W. Saito, F. Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
author_facet |
Kuniyoshi, Y. Abe-Ouchi, A. Sherriff-Tadano, S. Chan, W. Saito, F. |
author_sort |
Kuniyoshi, Y. |
title |
Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
title_short |
Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
title_full |
Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
title_fullStr |
Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
title_full_unstemmed |
Effect of Climatic Precession on Dansgaard-Oeschger-Like Oscillations |
title_sort |
effect of climatic precession on dansgaard-oeschger-like oscillations |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020676 |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3869 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020676 |
op_doi |
https://doi.org/10.57757/IUGG23-3869 |
_version_ |
1772185191938260992 |