Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses
The role of mean and stochastic freshwater forcing on the generation of millennial-scale climate variability in the North Atlantic is studied using a low-order coupled atmosphere–ocean–sea ice model. It is shown that millennial-scale oscillations can be excited stochastically, when the North Atlanti...
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ftharvardudash:oai:dash.harvard.edu:1/3441488 2023-05-15T15:59:59+02:00 Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses Timmermann, Axel Gildor, Hezi Michael, Schulz Tziperman, Eli 2003 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:3441488 https://doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 en_US eng American Meteorological Society http://dx.doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 Journal of Climate Timmermann, Axel, Hezi Gildor, Michael Schulz, and Eli Tziperman. 2003. Coherent resonant millennial-scale climate oscillations triggered by massive meltwater pulses. Journal of Climate 16(15): 2569-2585. 0894-8755 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3441488 doi:10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 Journal Article 2003 ftharvardudash https://doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 2022-04-04T12:36:29Z The role of mean and stochastic freshwater forcing on the generation of millennial-scale climate variability in the North Atlantic is studied using a low-order coupled atmosphere–ocean–sea ice model. It is shown that millennial-scale oscillations can be excited stochastically, when the North Atlantic Ocean is fresh enough. This finding is used in order to interpret the aftermath of massive iceberg surges (Heinrich events) in the glacial North Atlantic, which are characterized by an excitation of Dansgaard–Oeschger events. Based on model results, it is hypothesized that Heinrich events trigger Dansgaard–Oeschger cycles and that furthermore the occurrence of Heinrich events is dependent on the accumulated climatic effect of a series of Dansgaard–Oeschger events. This scenario leads to a coupled ocean–ice sheet oscillation that shares many similarities with the Bond cycle. Further sensitivity experiments reveal that the timescale of the oscillations can be decomposed into stochastic, linear, and nonlinear deterministic components. A schematic bifurcation diagram is used to compare theoretical results with paleoclimatic data. Earth and Planetary Sciences Version of Record Article in Journal/Newspaper Dansgaard-Oeschger events Ice Sheet North Atlantic Sea ice Harvard University: DASH - Digital Access to Scholarship at Harvard |
institution |
Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
The role of mean and stochastic freshwater forcing on the generation of millennial-scale climate variability in the North Atlantic is studied using a low-order coupled atmosphere–ocean–sea ice model. It is shown that millennial-scale oscillations can be excited stochastically, when the North Atlantic Ocean is fresh enough. This finding is used in order to interpret the aftermath of massive iceberg surges (Heinrich events) in the glacial North Atlantic, which are characterized by an excitation of Dansgaard–Oeschger events. Based on model results, it is hypothesized that Heinrich events trigger Dansgaard–Oeschger cycles and that furthermore the occurrence of Heinrich events is dependent on the accumulated climatic effect of a series of Dansgaard–Oeschger events. This scenario leads to a coupled ocean–ice sheet oscillation that shares many similarities with the Bond cycle. Further sensitivity experiments reveal that the timescale of the oscillations can be decomposed into stochastic, linear, and nonlinear deterministic components. A schematic bifurcation diagram is used to compare theoretical results with paleoclimatic data. Earth and Planetary Sciences Version of Record |
format |
Article in Journal/Newspaper |
author |
Timmermann, Axel Gildor, Hezi Michael, Schulz Tziperman, Eli |
spellingShingle |
Timmermann, Axel Gildor, Hezi Michael, Schulz Tziperman, Eli Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
author_facet |
Timmermann, Axel Gildor, Hezi Michael, Schulz Tziperman, Eli |
author_sort |
Timmermann, Axel |
title |
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
title_short |
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
title_full |
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
title_fullStr |
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
title_full_unstemmed |
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses |
title_sort |
coherent resonant millennial-scale climate oscillations triggered by massive meltwater pulses |
publisher |
American Meteorological Society |
publishDate |
2003 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:3441488 https://doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 |
genre |
Dansgaard-Oeschger events Ice Sheet North Atlantic Sea ice |
genre_facet |
Dansgaard-Oeschger events Ice Sheet North Atlantic Sea ice |
op_relation |
http://dx.doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 Journal of Climate Timmermann, Axel, Hezi Gildor, Michael Schulz, and Eli Tziperman. 2003. Coherent resonant millennial-scale climate oscillations triggered by massive meltwater pulses. Journal of Climate 16(15): 2569-2585. 0894-8755 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3441488 doi:10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 |
op_doi |
https://doi.org/10.1175/1520-0442%282003%29016%3C2569%3ACRMCOT%3E2.0.CO%3B2 |
_version_ |
1766395869437886464 |