Abstract
The impact of changes in volume, heat and freshwater fluxes through Arctic gateways on sea ice, circulation and fresh water and heat contents of the Arctic and North Atlantic Oceans is not fully understood. To explore the role played by each gateway, we use a regional sea-ice ocean general circulation model with a fixed atmospheric forcing. We run sensitivity simulations with combinations of Bering Strait (BS) and Canadian Arctic Archipelago (CAA) open and closed inspired by paleogeography of the Arctic. We show that fluxes through BS influence the Arctic, Atlantic and Nordic Seas while the impact of the CAA is more dominant in the Nordic Seas. In the experiments with BS closed, there is a change in the surface circulation of the Arctic with a weakening of the Beaufort Gyre by about thirty percent. As a consequence, the Siberian river discharge is spread offshore to the west, rather than being directly advected away by the Transpolar Drift. This results in a decrease of salinity in the upper 50 m across much of the central Arctic and East Siberian and Chukchi Seas. We also find an increase in stratification between the surface and subsurface layers after closure of BS. Moreover, closure of the BS results in an upward shift of the relatively warm waters lying between 50 and 120 m, as well as a reorganization of heat storage and transport. Consequently, more heat is kept in the upper layers of the Arctic Ocean, thus increasing the heat content in the upper 50 m and leading to a thinner sea ice cover. The CAA closing has a large impact on sea ice, temperature and salinity in the subarctic North Atlantic with opposite responses in the Greenland-Iceland-Norwegian Seas and Baffin Bay. It is also found that CAA being open or closed strongly controls the sea ice export through the Fram Strait. In all our experiments, the changes in temperature and salinity of the Barents and Kara Seas, and in fluxes through Barents Sea Opening are relatively small, suggesting that they are likely controlled by the atmospheric processes. Our results demonstrate the need to take into consideration the fluxes through the Arctic gateways when addressing the ocean and climate changes during deglaciations as well as for predictions of future climate.
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Acknowledgements
This work is an ArcTrain contribution. It was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) Grants awarded to PGM (RGPIN 227438-09, RGPIN 04357 and RGPCC 433898) and ADV (38340 and 432295) and by the Fonds de Recherche du Québec-Nature et Technologies (FRQNT). We are grateful to the NEMO development team and the Drakkar project for providing the model and continuous guidance. This work could not have been possible without the computational resources provided by Westgrid and Compute Canada, where the model simulations were run and are archived (www.computecanada.ca). We thank NCAR/UCAR for making Dai and Trenberth Global River Flow and Continental Discharge Dataset available. We acknowledge WCRP/CLIVAR Ocean Model Development Panel (OMDP) for sponsoring and organizing the Coordinated Ocean-sea ice Reference Experiments dataset (CORE). The GLORYS reanalysis project is carried out in the framework of the European Copernicus Marine Environment Monitoring Service (CMEMS). For details of model simulations, visit http://knossos.eas.ualberta.ca/anha/. This work is a contribution to NSF Grant 1504023, 1504358 awarded to A. Jahn, M. Holland and LBT. We thank the reviewers for their constructive comments and Dr. Tim Kruschke for his help.
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Appendix: Strength of Beaufort Gyre
Appendix: Strength of Beaufort Gyre
From a theoretical point of view, the influx of PV through the BS has the largest share in the PV budget of the Arctic as it is a shallow gateway (Yang 2005). Since the wind field is unchanged, the change in the potential vorticity balance is the main factor changing the strength of Beaufort Gyre. The advection of potential vorticity is a function of torque due to the joint effect of density and topographic gradients (JEBAR effect) and the torques exerted by the wind and bottom stresses. By applying this theory to our model analysis, we find that since those terms for wind and bottom stresses are kept unchanged in our sensitivity experiments, closing BS and the associated change in the density field is responsible for the change in the advection of PV, and thus the change in the Beaufort Gyre. It should be noted that the resolution of our model (Fig. 1) is slightly coarser than the Rossby radius of deformation in the Arctic (ranging between 2 and 15 km; Timmermans and Marshall 2020), and therefore, our model is not eddy resolving and might not be fully compatible with the mentioned theory (Figs.
10,
11,
12).
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Karami, M.P., Myers, P.G., de Vernal, A. et al. The role of Arctic gateways on sea ice and circulation in the Arctic and North Atlantic Oceans: a sensitivity study with an ocean-sea-ice model. Clim Dyn 57, 2129–2151 (2021). https://doi.org/10.1007/s00382-021-05798-6
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DOI: https://doi.org/10.1007/s00382-021-05798-6