Article (Scientific journals)
Greenland summer blocking characteristics: an evaluation of a high-resolution multi-model ensemble
Luu, Linh N.; Hanna, Edward; de Alwis Pitts, Dilkushi et al.
2024In Climate Dynamics
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Abstract :
[en] AbstractAtmospheric blocking is a phenomenon that can lead to extreme weather events over a large region, yet its causes are not fully understood. Global climate models show limitations in representing Northern Hemisphere blocking, especially its frequency, and decadal variability in Greenland blocking in summer in the recent decades. In this study we evaluate the ability of high-resolution (HighResMIP) Earth System Models (ESMs) to simulate summer blocking over the Greenland area, using different but complementary methods to describe the characteristics of blocking. We find that the HighResMIP ensemble can reproduce the spatial pattern of Greenland blocking events, albeit with systematic biases, and capture the relative frequencies of the main blocking patterns: namely the wave breaking structure, North Atlantic ridge, and omega-type blocking. However, the HighResMIP ensemble fails to simulate the observed temporal variations of Greenland blocking index (GB2) and the extremely high values of daily GB2 observed in recent decades. In addition, we do not find clearly superior representation of blocking features from higher-resolution in HighResMIP models compared with lower-resolution models. We also find large sea surface temperature (SST) biases over the North Atlantic and seas surrounding Greenland, and biases in moisture transport over the North Atlantic toward Greenland, especially over the western flank of blocking areas, which might together contribute to model biases in the representation of blocking magnitude.
Research Center/Unit :
SPHERES - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Luu, Linh N. 
Hanna, Edward
de Alwis Pitts, Dilkushi
Maddison, Jacob
Screen, James A.
Catto, Jennifer L.
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Greenland summer blocking characteristics: an evaluation of a high-resolution multi-model ensemble
Publication date :
16 October 2024
Journal title :
Climate Dynamics
ISSN :
0930-7575
eISSN :
1432-0894
Publisher :
Springer Science and Business Media LLC
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NERC - Natural Environment Research Council
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since 17 October 2024

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