[Bolincentret-at-su.se] Seminar - Michiel Helsen - Oct 20

[Cecilia Wesslén]

SEMINAR

*Name*
Michiel Helsen
Utrecht University, The Netherlands

*Title*
Simulating Holocene Greenland ice sheet retreat in an ice sheet - earth 
system model framework

*Time and place*
Tuesday 20 October 2015, 11.15
Room C609, Arrhenius Laboratory, 6th floor

*Abstract*
The earth system model EC-Earth is a valuable tool to calculate effects 
of greenhouse gas (GHG) scenarios on various components of the climate 
system. We aim to couple a thermomechanical ice sheet model to EC-Earth 
to not only quantify effects of GHG scenarios on ice mass changes, but 
also to take into account the effects of geometrical changes of the ice 
sheet on the climate system. Preliminary steps towards a coupled model 
are undertaken.

Here we use a LGM simulation of EC-Earth to initialize a Greenland ice 
sheet model, as a starting point for a simulation of the evolution of 
the Greenland ice sheet through the Holocene. Geological evidence of ice 
sheet extent is used to constrain the size of the LGM ice sheet. An 
energy balance approach is used to calculate the surface mass balance 
(SMB) over the ice sheet, to translate atmospheric fields to a realistic 
climate forcing for the ice sheet within EC-Earth. First results point 
out that the SMB forcing from EC-Earth underestimates ablation rates, 
which hampers a realistic simulation of Holocene retreat. In addition, a 
strong negative mass balance forcing from sub-shelf melting is needed to 
reproduce Holocene ice sheet retreat rates.
*
**Welcome!*


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