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The sensitivity of Euro-Atlantic regimes to model horizontal resolution

Strommen, K., Mavilia, I., Corti, S., Matsueda, M., Davini, P., von Hardenberg, J., Vidale, P. L. and Mizuta, R. (2019) The sensitivity of Euro-Atlantic regimes to model horizontal resolution. Geophysical Research Letters, 46 (13). pp. 7810-7818. ISSN 1944-8007

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To link to this item DOI: 10.1029/2019GL082843

Abstract/Summary

There is growing evidence that the atmospheric dynamics of the Euro-Atlantic sector during winter is driven in part by the presence of quasi-persistent regimes. However, general circulation models typically struggle to simulate these with, for example, an overly weakly persistent blocking regime. Previous studies have showed that increased horizontal resolution can improve the regime structure of a model but have so far only considered a single model with only one ensemble member at each resolution, leaving open the possibility that this may be either coincidental or model dependent. We show that the improvement in regime structure due to increased resolution is robust across multiple models with multiple ensemble members. However, while the high-resolution models have notably more tightly clustered data, other aspects of the regimes may not necessarily improve and are also subject to a large amount of sampling variability that typically requires at least three ensemble members to surmount.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:86929
Uncontrolled Keywords:Euro‐Atlantic, atmospheric dynamics, climate model, clustering, horizontal resolution, weather regimes
Publisher:American Geophysical Union

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