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| Kurahashi-nakamura, Takasumi; Paul, Andre; Munhoven, Guy; Merkel, Ute; Schulz, Michael. |
| We developed a coupling scheme for the Community Earth System Model version 1.2 (CESM1.2) and the Model of Early Diagenesis in the Upper Sediment of Adjustable complexity (MEDUSA), and explored the effects of the coupling on solid components in the upper sediment and on bottom seawater chemistry by comparing the coupled model's behaviour with that of the uncoupled CESM having a simplified treatment of sediment processes. CESM is a fully coupled atmosphere-ocean-sea-ice-land model and its ocean component (the Parallel Ocean Program version 2; POP2) includes a biogeochemical component (the Biogeochemical Elemental Cycling model; BEC). MEDUSA was coupled to POP2 in an offline manner so that each of the models ran separately and sequentially with regular... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00676/78790/81068.pdf |
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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... |
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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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| Ronge, Thomas A.; Steph, Silke; Tiedemann, Ralf; Prange, Matthias; Merkel, Ute; Nuernberg, Dirk; Kuhn, Gerhard. |
| Glacial/interglacial changes in Southern Ocean's air-sea gas exchange have been considered as important mechanisms contributing to the glacial/interglacial variability in atmospheric CO2. Hence, understanding past variability in Southern Ocean intermediate to deep water chemistry and circulation is fundamental to constrain the role of these processes on modulating glacial/interglacial changes in the global carbon cycle. Our study focused on the glacial/interglacial variability in the vertical extent of southwest Pacific Antarctic Intermediate Water (AAIW). We compared carbon and oxygen isotope records from epibenthic foraminifera of sediment cores bathed in modern AAIW and Upper Circumpolar Deep Water (UCDW; 943–2066 m water depth) to monitor changes in... |
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Palavras-chave: AAIW; UCDW; SW-Pacific; Stable isotopes. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00294/40568/39465.pdf |
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