Oceanic versus atmospheric mechanisms of the North Atlantic warming hole ...
Over the past century, a large region of the subpolar North Atlantic experienced a slight cooling, dubbed the North Atlantic Warming Hole (NAWH). A similar warming hole also emerges in the global warming projections for this region. The causes of the NAWH remain under debate as both oceanic (the Atl...
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| Format: | Conference Object |
| Language: | unknown |
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GFZ German Research Centre for Geosciences
2023
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| Online Access: | https://dx.doi.org/10.57757/iugg23-3730 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020813 |
| Summary: | Over the past century, a large region of the subpolar North Atlantic experienced a slight cooling, dubbed the North Atlantic Warming Hole (NAWH). A similar warming hole also emerges in the global warming projections for this region. The causes of the NAWH remain under debate as both oceanic (the Atlantic meridional overturning circulation) and atmospheric processes can potentially explain this phenomenon. Here, we compare the results of several recent studies investigating the mechanisms of the NAWH. In the future climate the warming hole appears to be strongly linked to the AMOC weakening as seen for example in large-ensemble simulations using CESM1 (Liu et al. 2020). However, sensitivity experiments with coupled GCMs also show that a warming hole can be induced by remotely-induced wind changes in the North Atlantic. Specifically, Arctic sea ice decline is shown to cause a strong warming hole within the southern part of the subpolar gyre without any significant change in the AMOC (Ferster et al. 2022). ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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