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| Zhang, Xiao; Prange, Matthias; Merkel, Ute; Schulz, Michael. |
| Pronounced millennial-scale climate variability during marine isotope stage 3 (MIS3) is considered to be linked to changes in the state of the Atlantic meridional overturning circulation (AMOC), i.e., a warm interstadial/cold stadial state corresponds to a strong/weak AMOC. Based on a series of freshwater hosing/extraction experiments with the state-of-the-art Community Climate System Model version 3, we construct a global spatial fingerprint of oceanic temperature anomalies in response to AMOC changes under MIS3 boundary conditions. Highest sensitivity to AMOC changes, especially in summer, is found in northeastern North Atlantic sea surface temperature, but a characteristic temperature fingerprint is also found at subsurface levels. After testing... |
| Tipo: Text |
Palavras-chave: Atlantic meridional overturning circulation; Dansgaard-Oeschger events; Global climate modeling. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00351/46267/46052.pdf |
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| Zhang, Xiao. |
| v Abstract This thesis focused on the Atlantic Meridional Overturning Circulation (AMOC) stability and global climate responses of an altered AMOC in the late Neogene by performing computer simulations, using both intermediate complexity climate models and state-of-the-art coupled climate models. Two time slices were studied: 1) 38 ka BP (kilo years before present), during Heinrich event 4, and 2) around 4- 5 million years ago, when the Panamanian Seaway finally gradually closed. The AMOC is one of the most important climate systems modulating the world climate due to the significant amount of oceanic transport of heat, carbon and nutrients. Understanding the AMOC stability behaviour is essential to investigate climate in the past and present as well as... |
| Tipo: Text |
Palavras-chave: Atlantic Meridional Overturning Circulation; Climate instability; State-of-the-art model simulation. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00505/61710/65679.pdf |
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