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Edouard L. Davin, Reto Stöckli, Paulo J. C. Oliveira, Sonia I. Seneviratne

Edouard L. Davin, Reto Stöckli, Paulo J. C. Oliveira, Sonia I. Seneviratne Institute for Atmospheric and Climate Science, ETH Zürich. Coupling CLM3.5 with the COSMO regional model. LMWG meeting, Breckenridge, June 2008. Context. The Land-Climate Interactions group @ ETH.

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Edouard L. Davin, Reto Stöckli, Paulo J. C. Oliveira, Sonia I. Seneviratne

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  1. Edouard L. Davin, Reto Stöckli, Paulo J. C. Oliveira, Sonia I. Seneviratne Institute for Atmospheric and Climate Science, ETH Zürich Coupling CLM3.5 with the COSMO regional model LMWG meeting, Breckenridge, June 2008

  2. Context The Land-Climate Interactions group @ ETH • 2 projects using CLM3.5 are starting in the group: • PhD Paulo Oliveira: Past and future trends in the hydrological cycle (poster). • Coupling of CLM3.5 with COSMO (started by Reto Stöckli)

  3. The MAIOLICA project ETH-Funded project MAIOLICA (started april 2008). Goal: “explore the links between the atmosphere and the biosphere within the Earth system”. Activity 3a: “understanding of regional interactions of the biosphere with the climate at the scale of the European continent, for both present and future climate conditions“.

  4. The COSMO model Numerical weather prediction LM 1.1 Regional climate simulations LM 2.16 Climate-LM 1 LM 2.19 Climate-LM 2 LM 3.x Climate-LM 2.x • Non-hydrostatic mesoscale model. • Community Model shared with several institutions in Europe: GKSS, ETH Zurich, JRC, DWD, MeteoSwiss, ... • Resolution typically around 50km for climate simulations over Europe. COSMO 4.0

  5. Land surface scheme The new COSMO-CLM RCM: COSMO CLM3.5 TERRA is currently integrated in COSMO as the land surface component. TERRA is mostly a “soil model” without explicit representation of vegetation processes. A more detailed land surface scheme is needed in order to represent biosphere-atmosphere interactions (coupling between photosynthesis and transpiration, root uptake, phenology, carbon cycle…). The new model represents an advance in the regional climate modelling community (e.g., EU-projects PRUDENCE & ENSEMBLES).

  6. 20th century climate • There is systematic biases in simulations of european climate by RCMs (e.g., RCMs within PRUDENCE). • Could some of these biases be alleviated by a better representation of land surface processes? • We will run a 20th century simulation with COSMO-CLM3.5 driven by ERA40 and compare it with existing simulations with COSMO and other RCMs (e.g. PRUDENCE, ENSEMBLES). Summer temperature interannual variability: COSMO minus CRU (Jaeger et al., 2008)

  7. Future scenarios (Seneviratne et al, 2006) • Atmosphere-sol moisture coupling. Identify land surface feedbacks and processes relevant for future climate projections over Europe.

  8. Future scenarios • Atmosphere-sol moisture coupling. • Change in vegetation functioning and structure (LAI, stomatal conductance..). • Land cover change. • Identify land surface feedbacks and processes relevant for future climate projections over Europe. • Simulations over the 21st century will be carried out with the new COSMO-CLM3.5 driven by a CGM.

  9. Preliminary results Comparison of COSMO-CLM3.5 versus COSMO (1 year run without spinup) Annual mean sensible heat (W/m2) Annual mean latent heat (W/m2) Comparison with flux measurements at Tharandt (Germany)

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