Climatic Drivers of Ice Slabs and Firn Aquifers in Greenland

Author:

Brils M.1ORCID,Munneke P. Kuipers1ORCID,Jullien N.2ORCID,Tedstone A. J.2ORCID,Machguth H.2,van de Berg W. J.1ORCID,van den Broeke M. R.1ORCID

Affiliation:

1. Institute for Marine and Atmospheric Research Utrecht University Utrecht The Netherlands

2. Department of Geosciences University of Fribourg Fribourg Switzerland

Abstract

AbstractRecent observations revealed the existence of ice slabs and aquifers on the Greenland ice sheet (GrIS). Both affect the ice sheet's hydrology: ice slabs facilitate runoff and aquifers modulate drainage to the bed. However, their climatic drivers and history remain unclear, as most observations cover only two decades. Here, we present a model simulation of the evolution of GrIS ice slabs and aquifers (1980–2020), evaluated using radar measurements. The results show that accumulation, melt and rain rates are good predictors for the spatial distribution of ice slabs and aquifers. Both features were already present in the late 1980s, and their extent remained relatively constant until the beginning of this century, after which increased melt led to their expansion. We show that almost any transect from the coast to the ice‐sheet interior will cross either an ice slab region, or an aquifer, or both.

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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