Greenland ice sheet rainfall, heat and albedo feedback impacts from the mid-August 2021 atmospheric river

Jason E. Box, Adrien Wehrlé, Dirk van As, Robert S. Fausto, Kristian K. Kjeldsen, Amrin Dachauer, Andreas P. Ahlstrøm, Ghislain Picard

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

4 Citationer (Scopus)

Abstrakt

Rainfall at the Greenland ice sheet Summit 14 August 2021, was delivered by an atmospheric river (AR). Extreme surface ablation expanded the all-Greenland bare ice area to near-record-high with snowline climbing up to 788 ± 90 m. Ice sheet wet snow extent reached 46%, a record high for the 15–31 August AMSR data since 2003. Heat-driven firn deflation averaged 0.14 ± 0.05 m at four accumulation area automatic weather stations (AWSs). Energy budget calculations from AWS data indicate that surface heating from rainfall is much smaller than from either the sensible, latent, net-longwave or solar energy fluxes. Sensitivity tests show that without the heat-driven snow-darkening, melt at 1,840 m would have totaled 28% less. Similarly, at 1,270 m elevation, without the bare ice exposure, melting would have been 51% less. Proglacial river discharge was the highest on record since 2006 for late August and confirms the melt-sustaining effect of the albedo feedback.

OriginalsprogEngelsk
Artikelnummere2021GL097356
Antal sider11
TidsskriftGeophysical Research Letters
Vol/bind49
Udgave nummer11
DOI
StatusUdgivet - 16 jun. 2022

Programområde

  • Programområde 5: Natur og klima

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