Physical and biogeochemical responses to freshwater-induced thermohaline variability in a zonally averaged ocean model ...
Freshwater perturbation experiments are conducted with a latitude-depth, circulation-biogeochemistry ocean model coupled to an energy balance model of the atmosphere. The aim is to identify potential effects of different changes of the Atlantic thermohaline circulation (THC). Strong THC reductions (...
| Main Authors: | , , |
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| Format: | Text |
| Language: | unknown |
| Published: |
American Geophysical Union
1999
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48350/161016 https://boris.unibe.ch/161016/ |
| Summary: | Freshwater perturbation experiments are conducted with a latitude-depth, circulation-biogeochemistry ocean model coupled to an energy balance model of the atmosphere. The aim is to identify potential effects of different changes of the Atlantic thermohaline circulation (THC). Strong THC reductions (> 50%) lead to cooling at high northern latitudes and warming in the southern hemisphere. For moderate reductions, however, cooling in the north is not accompanied by temperature changes in the south. These results are discussed in relation with a recent synchronization of isotopic records from Greenland and Antarctic ice cores based on methane, which documents north-south thermal antiphasing during the largest Greenland δ18O oscillations and no clear Antarctic counterparts during the other, shorter oscillations of the last glacial period. Simulations show that strong THC reductions resultd in PO4 enrichment and δ13C depletion below 1 km in the North Atlantic reaching, on average, about 0.5 mmol m-3 and-0.3‰ ... |
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