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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 on theme: "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."— Presentation transcript:

1 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

2 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(?)

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

4 PALVAREX III: Data assimilation Proxies Calibration data set Reconstruction

5 Assimilation of proxies many possible states (model) Reduced range of possible states („assimilation“) Ensemble Kalman Filter ECHAM5.4, T63L31, 30 members 1600-2010, run at CSCS

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

7 Current state: around 1800

8 Nudged runs > (not started yet) —Use 20CR to nudge ECHAM5-HAM (1871-2008) —Some tests performed, need to carefully look at interpolation (mass consistency)

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