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Blocking representation in the ERA-Interim driven EURO-CORDEX RCMs

Abstract: While Regional Climate Models (RCMs) have been shown to yield improved simulations compared to General Circulation Model (GCM), their representation of large-scale phenomena like atmospheric blocking has been hardly addressed. Here, we evaluate the ability of RCMs to simulate blocking situations present in their reanalysis driving data and analyse the associated impacts on anomalies and biases of European 2-m air temperature (TAS) and precipitation rate (PR). Five RCM runs stem from the EURO-CORDEX ensemble while three RCMs are WRF models with different nudging realizations, all of them driven by ERA-Interim for the period 1981?2010. The detected blocking systems are allocated to three sectors of the Euro-Atlantic region, allowing for a characterization of distinctive blocking-related TAS and PR anomalies. Our results indicate some misrepresentation of atmospheric blocking over the EURO-CORDEX domain, as compared to the driving reanalysis. Most of the RCMs showed fewer blocks than the driving data, while the blocking misdetection was negligible for RCMs strongly conditioned to the driving data. A higher resolution of the RCMs did not improve the representation of atmospheric blocking. However, all RCMs are able to reproduce the basic anomaly structure of TAS and PR connected to blocking. Moreover, the associated anomalies do not change substantially after correcting for the misrepresentation of blocking in RCMs. The overall model bias is mainly determined by pattern biases in the representations of surface parameters during non-blocking situations. Biases in blocking detections tend to have a secondary influence in the overall bias due to compensatory effects of missed blockings and non-blockings. However, they can lead to measurable effects in the presence of a strong blocking underestimation.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Climate Dynamics March 2019, Volume 52, Issue 5?6, pp 3291?3306

Editorial: Springer

 Fecha de publicación: 01/03/2019

Nº de páginas: 16

Tipo de publicación: Artículo de Revista

DOI: 10.1007/s00382-018-4335-8

ISSN: 0930-7575,1432-0894

Proyecto español: CGL2015-66583- R ; CGL2015-69699-R

Url de la publicación: https://link.springer.com/article/10.1007/s00382-018-4335-8#citeas

Autores/as

JURY, MARTIN WOLFGANG

JOSE MANUEL GUTIERREZ LLORENTE

BARRIOPEDRO, DAVID