... | ... | @@ -28,12 +28,12 @@ Here are the different model experiments with the corresponding color in the plo |
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**Results** show that:
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- Fig. 1: the mean Atlantic OHT increases north of 60N and decreases south of 60N compared to the control run in the experiments where the SST restoring is imposed in the North Atlantic and northern North Atlantic (no clear change with the restoring occurring only at the BSO); the OHT increase north of 60N is logical as the SST is getting warmer; the reason for the decrease south of 60N is probably linked to a weakening of the ocean circulation at latitudes lower than 60N following the increase in SST (so decrease in density) (see Fig. 8);
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- Fig. 2: the total OHT to the Arctic through all Arctic straits (BSO, Fram, Bering, Davis) clearly increases with increasing SST; the strength of the increase in OHT increases with higher SST and is clearly higher with the North Atlantic domain compared to the 2 other domains; with the BSO domain, the OHT increase is relatively small; so the larger the domain for the SST increase, the higher the resulting OHT increase;
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- Fig. 2: the total OHT to the Arctic through all Arctic straits (BSO, Fram, Bering, Davis) clearly increases with increasing SST; the increase in OHT is larger with higher SST and is clearly larger with the North Atlantic domain compared to the 2 other domains; with the BSO domain, the OHT increase is relatively small; so the larger the domain for the SST increase, the higher the resulting OHT increase;
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- Fig. 3: this is the OHT through the BSO, which is the most important OHT contributor to the Arctic; results are broadly consistent with Fig. 2, except that the increase in OHT does not linearly increase with the increase in SST when the BSO domain (smallest domain) is considered;
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- Fig. 4: there is an overall OHT increase at Fram Strait with SST when using the 2 first (larger) domains and not really when using the BSO domain; however, the OHT increase is much lower than for the BSO and the increase occurs in the first 20 years of the simulation before decreasing to values close or below the control run;
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- the OHT at the Bering Strait also increases with increasing SST for all 3 domains, but the strength of the
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increase is much lower compared to BSO and Fram; and the changes in OHT at Davis Strait are very small in all experiments (not shown);
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- Figs. 5 and 6: the total Arctic-sea ice area (SIA) and volume (SIV) decrease in all experiments with SST increase, in agreement with the OHT increase; the strength of the SIA decrease is higher with increased SST for the 2 first domains, but not for the BSO domain (where the strength of the SIA decrease is relatively similar between the 3 experiments);
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- Figs. 5 and 6: the total Arctic-sea ice area (SIA) and volume (SIV) decrease in all experiments with higher SST, in agreement with the OHT increase; the SIA decrease is larger with increased SST for the 2 first domains, but not for the BSO domain (where the strength of the SIA decrease is relatively similar between the 3 experiments);
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- Fig. 7: the spatial extent of the SST increase follows the domain used for the SST restoring, with a larger spatial extent in the SST increase with the larger domain;
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- Fig. 8: the mixed layer depth in the Labrador, northern North Atlantic and Greenland-Iceland-Norway (GIN) Seas decreases with SST increase for the 2 larger domains (North Atlantic and northern North Atlantic); this probably explains the OHT decreases south of 60N, following a weakening of the overturning circulation.
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