Evaluating a regional climate model simulation of Greenland ice sheet snow and firn density for improved surface mass balance estimates

Alexander, P.; Tedesco, M.; Koening, L.; Fettweis, Xavier

doi:10.1029/2019GL084101

Article (Scientific journals)

Evaluating a regional climate model simulation of Greenland ice sheet snow and firn density for improved surface mass balance estimates

Alexander, P.; Tedesco, M.; Koening, L. et al.

2019 • In Geophysical Research Letters

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https://hdl.handle.net/2268/240310

DOI
10.1029/2019GL084101

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Abstract :

[en] Modeling vertical profiles of snow and firn density near the surface of the Greenland ice sheet (GrIS) is key to estimating GrIS mass balance, and by extension, global sea level change. To understand sources of error in simulated GrIS density, we compare GrIS density profiles from a leading regional climate model with coincident in situ measurements. We identify key contributors to model density and mass balance biases, including underestimated simulated fresh snow density (which leads to underestimation of density in the top 1 m of snow by ~10%). In areas undergoing frequent melting, positive density biases (of 7% in the top 1 m, and 10% between 1 and 10 m) are likely associated with errors in representing meltwater production, retention and refreezing. The results highlight the importance of accurately capturing fresh snow density and meltwater processes in models used to estimate GrIS mass balance change.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Alexander, P.

Tedesco, M.

Koening, L.

Fettweis, Xavier ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie

Language :

English

Title :

Evaluating a regional climate model simulation of Greenland ice sheet snow and firn density for improved surface mass balance estimates

Publication date :

11 October 2019

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Wiley, Washington, United States - District of Columbia

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL084101

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since 15 October 2019

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