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Global Climate Modelling Department “Physical Climate System” Mojib Latif, Erich Roeckner and Uwe Mikolajewicz
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Outline Scientific questions Modelling philosophy
MPI global climate models Variability and predictability of the THC Quasi-equilibrium response to insolation changes Outlook
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Scientific questions (I)
Internal climate variability What are the mechanisms of climate variations on seasonal to interdecadal timescales? How predictable are these variations?
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Scientific questions (II)
Forced climate variability Can we understand the paleo-climatic record? What is the response of the climate system to anthropogenic forcing? extreme events stability of the THC
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Modelling philosophy The long-term goal is the development of a hierarchy of Earth System Models. A high-resolution model for simulations up to a few hundred years. A medium-resolution model for simulations up to a few thousand years. A coarse-resolution Earth System Model for simulations of glacial/interglacial cycles.
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MPI global climate models (I)
Seasonal to interdecadal timescales, 20th and 21st century integrations Current workhorse: ECHAM5(T42), MPI-OM1 (C-HOPE, Marsland et al. 2002) incl. dynamic/thermodynamic sea ice model, no flux adjustments. Under development: substantial increase in resolution for shorter integrations (T106 for atmosphere, eddy-permitting in the ocean). Inclusion of biogeochemistry
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MPI global climate models (II)
Paleo-climatic studies Current workhorse: ECHAM3(T21), LSG-1 incl. thermodynamic sea ice model, with flux adjustments Under development: ECHAM5(T21), LSG-2 incl. dynamic/thermodynamic sea ice model, HAMOCC-4, LPJ, SICOPOLIS
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Simulation of North Atlantic ocean heat transport with ECHAM5/MPI-OM-1
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Simulation of North Atlantic overturning ECHAM5/MPI-OM-1
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Simulation of North Atlantic multi-decadal variability
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THC/SST relationship
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Greenhouse gas (1%) integrations
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Externally forced variability
6K simulation 6K Global temperature control North Atlantic SST North Atlantic SSS North Atlantic overturning
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6K simulation surface temperature change
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6K simulation precipitation change
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Outlook Interactions between the physical climate system and the biogeochemical cycles, e.g. the carbon cycle Dynamics of glacial/interglacial transitions New dynamical core Consistency of tracer advection and dynamics Regionally enhanced resolution Non-hydrostatic Icosahedral grid
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