the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Influence of initial stratification, wind and sea ice on the modelled oceanic circulation in Nares Strait, northwest Greenland
Abstract. Nares Strait in northwest Greenland is one of the main gateways for oceanic freshwater and heat exchanges between the Arctic and the North Atlantic. With a changing Arctic climate, understanding the processes that govern the oceanic circulation in Arctic straits has become crucial and urgent, but this cannot be done with current geographically and temporally sparse in-situ observations only. High resolution regional modelling is thus required, but costly. We here report on one-year sensitivity experiments performed with the coupled ice-ocean regional model MITgcm to determine the relative importance of wind forcing, initial stratification and sea ice thickness on the accuracy of the modelled oceanic circulation in Nares Strait. We find that the modelled basin's circulation is mainly driven by density gradients in the upper oceanic layer, making accurate initial fields of temperature and salinity essential for a realistic oceanic circulation. The influence of the wind and sea ice thickness is less important, potentially making such high resolution fields not necessary for accurate strait modelling, provided these results are valid for other sea ice models as well. Comparison with ship-based measurements collected in summer 2015 reveals the experiments to be too cold at the surface, probably because of a not-dynamic-enough sea ice cover. Although the modelled freshwater is rather accurate, large efforts need to be put into observing the ocean and the sources of freshwater continuously throughout the year to produce realistic and efficient model simulations of the Arctic Straits, key players in the entire Arctic system and global climate.
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Interactive discussion
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RC1: 'os-2018-122 (referee) - referee comment request', Anonymous Referee #1, 13 Dec 2018
- SC1: 'Response to the reviewer', Céline Heuzé, 17 Dec 2018
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RC2: 'Review of manuscript os-2018-122', Anonymous Referee #2, 20 Dec 2018
- AC1: 'Response to reviewer', Lovisa Waldrop Bergman, 14 Jan 2019
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RC3: 'Review of manuscript os-2018-122', Anonymous Referee #3, 27 Dec 2018
- AC2: 'Response to reviewer', Lovisa Waldrop Bergman, 14 Jan 2019
Interactive discussion
-
RC1: 'os-2018-122 (referee) - referee comment request', Anonymous Referee #1, 13 Dec 2018
- SC1: 'Response to the reviewer', Céline Heuzé, 17 Dec 2018
-
RC2: 'Review of manuscript os-2018-122', Anonymous Referee #2, 20 Dec 2018
- AC1: 'Response to reviewer', Lovisa Waldrop Bergman, 14 Jan 2019
-
RC3: 'Review of manuscript os-2018-122', Anonymous Referee #3, 27 Dec 2018
- AC2: 'Response to reviewer', Lovisa Waldrop Bergman, 14 Jan 2019
Data sets
CTD data Petermann15 C. Heuzé and A. Wåhlin https://doi.org/10.1594/PANGAEA.893180
The ERA‐Interim reanalysis: configuration and performance of the data assimilation system D. P. Dee, S. M. Uppala, A. J. Simmons, P. Berrisford, P. Poli, S. Kobayashi, U. Andrae, M. A. Balmaseda, G. Balsamo, P. Bauer, P. Bechtold, A. C. M. Beljaars, L. van de Berg, J. Bidlot, N. Bormann, C. Delsol, R. Dragani, M. Fuentes, A. J. Geer, L. Haimberger, S. B. Healy, H. Hersbach, E. V. Hólm, L. Isaksen, P. Kållberg, M. Köhler, M. Matricardi, A. P. McNally, B. M. Monge‐Sanz, J.‐J. Morcrette, B.‐K. Park, C. Peubey, P. de Rosnay, C. Tavolato, J.‐N. Thépaut, and F. Vitart https://doi.org/10.1002/qj.828
MIMOC: A Global Monthly Isopycnal Upper-Ocean Climatology with Mixed Layers S. Schmidtko, G. C. Johnson, and J. M. Lyman https://doi.org/10.1002/jgrc.20122
The Copernicus Marine Environment Monitoring Service Ocean State Report Von Schuckmann et al. https://doi.org/10.1080/1755876X.2016.1273446
Climate and carbon cycle changes from 1850 to 2100 in MPI-ESM simulations for the coupled model intercomparison project phase 5 Giorgetta et al. https://doi.org/10.1002/jame.20038
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Lovisa Waldrop Bergman
Céline Heuzé
This preprint has been withdrawn.
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