ETH 2011 Work with ECHAM at the at University of Bern Stefan Brönnimann 1,2 1 Institute of Geography, University of Bern, Switzerland 2 Oeschger Centre.

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Presentation transcript:

ETH 2011 Work with ECHAM at the at University of Bern Stefan Brönnimann 1,2 1 Institute of Geography, University of Bern, Switzerland 2 Oeschger Centre for Climate Change Research, Switzerland

Projects cogito (Tambora effects on climate)SOCOL/MAECHAM4 => at ETH FUPSOLSOCOL/MAECHAM5/ocean => see Tom PALVAREX III (NCCR Climate)ECHAM5.4 Nudged run (20CR)ECHAM5-HAM(?)

Tambora eruption > Use 2D aerosol model (AER) to force SOCOL; used for geoengineering, Pinatubo (Tom): Patrizia Tambora, idealized eruptions (Stefan, Tom): Florian

PALVAREX III: Data assimilation Proxies Calibration data set Reconstruction

Assimilation of proxies many possible states (model) Reduced range of possible states („assimilation“) Ensemble Kalman Filter ECHAM5.4, T63L31, 30 members , run at CSCS

Test of approach in pseudo-world Winter (Nov. to April) Summer (May to Oct.) RE for temperature correlation Bhend et al., in preparation

Current state: around 1800

Nudged runs > (not started yet) —Use 20CR to nudge ECHAM5-HAM ( ) —Some tests performed, need to carefully look at interpolation (mass consistency)