On the ocean's response to enhanced Greenland runoff in model experiments: relevance of mesoscale dynamics and atmospheric coupling
-
Published:2023-02-20
Issue:1
Volume:19
Page:141-167
-
ISSN:1812-0792
-
Container-title:Ocean Science
-
language:en
-
Short-container-title:Ocean Sci.
Author:
Martin TorgeORCID, Biastoch ArneORCID
Abstract
Abstract. Increasing Greenland Ice Sheet melting is anticipated to impact water mass transformation in the subpolar North Atlantic and ultimately the meridional overturning circulation. Complex ocean and climate models are widely applied to estimate magnitude and timing of related impacts under global warming.
We discuss the role of the ocean mean state, subpolar water mass transformation, mesoscale eddies, and atmospheric coupling in shaping the response of the subpolar North Atlantic Ocean to enhanced Greenland runoff.
In a suite of eight dedicated 60- to 100-year-long model experiments with and without atmospheric coupling, with eddy processes parameterized and explicitly simulated and with regular and significantly enlarged Greenland runoff, we find
(1) a major impact by the interactive atmosphere in enabling a compensating temperature feedback,
(2) a non-negligible influence by the ocean mean state biased towards greater stability in the coupled simulations,
both of which make the Atlantic meridional overturning circulation less susceptible to the freshwater perturbation applied, and
(3) a more even spreading and deeper mixing of the runoff tracer in the subpolar North Atlantic and enhanced inter-gyre exchange with the subtropics in the strongly eddying simulations.
Overall, our experiments demonstrate the important role of mesoscale ocean dynamics and atmosphere feedback in projections of the climate system response to enhanced Greenland Ice Sheet melting and hence underline the necessity to advance scale-aware eddy parameterizations for next-generation climate models.
Funder
Bundesministerium für Bildung und Forschung
Publisher
Copernicus GmbH
Subject
Cell Biology,Developmental Biology,Embryology,Anatomy
Reference101 articles.
1. Aschwanden, A., Fahnestock, M. A., Truffer, M., Brinkerhoff, D. J., Hock, R.,
Khroulev, C., Mottram, R., and Khan, S. A.: Contribution of the Greenland Ice
Sheet to sea level over the next millennium, Sci. Adv., 5, eaav9396,
https://doi.org/10.1126/sciadv.aav9396, 2019. a 2. Bakker, P., Schmittner, A., Lenaerts, J. T. M., Abe-Ouchi, A., Bi, D., van den
Broeke, M. R., Chan, W.-L., Hu, A., Beadling, R. L., Marsland, S. J.,
Mernild, S. H., Saenko, O. A., Swingedouw, D., Sullivan, A., and Yin, J.:
Fate of the Atlantic Meridional Overturning Circulation: Strong decline under
continued warming and Greenland melting, Geophys. Res. Lett., 43,
12252–12260, https://doi.org/10.1002/2016gl070457, 2016. a 3. Bamber, J. L., Tedstone, A. J., King, M. D., Howat, I. M., Enderlin, E. M.,
van den Broeke, M. R., and Noel, B.: Land Ice Freshwater Budget of the Arctic
and North Atlantic Oceans: 1. Data, Methods, and Results, J.
Geophys. Res.-Ocean., 123, 1827–1837, https://doi.org/10.1002/2017jc013605,
2018. a, b, c, d 4. Barletta, V. R., Sørensen, L. S., and Forsberg, R.: Scatter of mass changes
estimates at basin scale for Greenland and Antarctica, The Cryosphere, 7,
1411–1432, https://doi.org/10.5194/tc-7-1411-2013, 2013. a 5. Behrens, E., Biastoch, A., and Böning, C. W.: Spurious AMOC trends in global
ocean sea-ice models related to subarctic freshwater forcing, Ocean
Model., 69, 39–49, https://doi.org/10.1016/j.ocemod.2013.05.004, 2013. a, b
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|