Université de Fribourg

Firn data compilation reveals widespread decrease of firn air content in western Greenland

Vandecrux, Baptiste ; MacFerrin, Michael ; Machguth, Horst ; Colgan, William T. ; As, Dirk van ; Heilig, Achim ; Stevens, C. Max ; Charalampidis, Charalampos ; Fausto, Robert S. ; Morris, Elizabeth M. ; Mosley-Thompson, Ellen ; Koenig, Lora ; Montgomery, Lynn N. ; Miège, Clément ; Simonsen, Sebastian B. ; Ingeman-Nielsen, Thomas ; Box, Jason E.

In: The Cryosphere, 2019, vol. 13, no. 3, p. 845–859

The perennial snow, or firn, on the Greenland ice sheet each summer stores part of the meltwater formed at the surface, buffering the ice sheet’s contribution to sea level. We gathered observations of firn air content, indicative of the space available in the firn to retain meltwater, and find that this air content remained stable in cold regions of the firn over the last 65 years but...

Université de Fribourg

A snow density dataset for improving surface boundary conditions in greenland ice sheet firn modeling

Fausto, Robert S. ; Box, Jason E. ; Vandecrux, Baptiste ; As, Dirk van ; Steffen, Konrad ; MacFerrin, Michael J. ; Machguth, Horst ; Colgan, William ; Koenig, Lora S. ; McGrath, Daniel ; Charalampidis, Charalampos ; Braithwaite, Roger J.

In: Frontiers in Earth Science, 2018, vol. 6, p. -

The surface snow density of glaciers and ice sheets is of fundamental importance in converting volume to mass in both altimetry and surface mass balance studies, yet it is often poorly constrained. Site-specific surface snow densities are typically derived from empirical relations based on temperature and wind speed. These parameterizations commonly calculate the average density of the top...

Université de Fribourg

Reconstructions of the 1900–2015 Greenland ice sheet surface mass balance using the regional climate MAR model

Fettweis, Xavier ; Box, Jason E. ; Agosta, Cécile ; Amory, Charles ; Kittel, Christoph ; Lang, Charlotte ; As, Dirk van ; Machguth, Horst ; Gallée, Hubert

In: The Cryosphere, 2017, vol. 11, no. 2, p. 1015–1033

With the aim of studying the recent Greenland ice sheet (GrIS) surface mass balance (SMB) decrease relative to the last century, we have forced the regional climate MAR (Modèle Atmosphérique Régional; version 3.5.2) model with the ERA-Interim (ECMWF Interim Re-Analysis; 1979–2015), ERA-40 (1958–2001), NCEP–NCARv1 (National Centers for Environmental Prediction–National Center for...