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SEMINAR<br>
<br>
<b>Name</b><br>
Michiel Helsen<br>
Utrecht University, The Netherlands<br>
<br>
<b>Title</b><br>
Simulating Holocene Greenland ice sheet retreat in an ice sheet -
earth system model framework<br>
<br>
<b>Time and place</b><br>
Tuesday 20 October 2015, 11.15<br>
Room C609, Arrhenius Laboratory, 6th floor<br>
<br>
<b>Abstract</b><br>
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.<br>
<br>
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.<br>
<b><br>
</b><b>Welcome!</b><br>
<br>
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