Seminar: A hierarchy of two-way coupled earth system-ice sheet model simulations with the MPI-ESM
On 13-Nov at 14:00 Christian Rodehacke will give a talk with the title: "A hierarchy of two-way coupled earth system-ice sheet model simulations with the MPI-ESM"
Oplysninger om arrangementet
Tidspunkt
Sted
DMI, Lyngbyvej 100, København
Arrangør
The seminar will take place in the "Daneborg"- room at DMI, Lyngbyvej 100, KBH Ø. Ask for "Joe" at the reception.
Fell free to pass the invitation around.
Abstract:
Christian Rodehacke*# Florian Ziemen*, Miren Vizcaino^, and Uwe Mikolajewicz*
*Max-Planck-Institut für Meteorologie Hamburg ^Technical University of Delft, Department of Geoscience and Remote Sensing # Now at DMI
As ice sheets belong to the slowest climate components, they are usually not interactively coupled in current climate models. Therefore, long-term climate projections are incomplete and only the consideration of ice sheet interactions allows tackling fundamental questions, such as how do ice sheets modify the reaction of the climate systems under a strong CO2 forcing? How do different coupling mechanisms and ice sheet models shape the results?
For future projections the current CMIP-5 earth system model MPI-ESM and the former version are coupled either via energy balance calculation or the traditional positive degree day approach (PPD method) to the two distinct ice sheet models SICOPOLIS and PISM. The first half of the talk addresses results from the newer CMIP5 system that has generally a higher spatial resolution and is coupled exclusively via energy balance calculation with a modified version of PISM. The second part focuses on comparisons of different model configurations by utilizing the coarser resolved former earth system. Here we identified how strong different coupling schemes (PDD versus energy balance) and ice sheet models (SICOPOLIS vs mPISM) influence model results.
Under a strong CO2 forcing a disintegrating Greenlandic ice sheet contributes to a rising sea level and has the potential to alter the formation of deep water masses in the adjacent formation sites Labrador Sea and Nordic Seas. We will present results for idealized forcings, such as a growing atmospheric CO2 concentration that rises by 1% per year until four-times the pre-industrial level has been reached. We will discuss the reaction of the ice sheet and immediate responses of the ocean to ice loss.