1. Comparison of some Transcom Continuous Experiment results for Hegyhatsal and Cabauw tall towers A.T. Vermeulen*, G. Pieterse, L. Haszpra, and the Transcom Continuous experiment participants

2. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 2 Setup Only tall towers in Europe operational in 2002-2003: Cabauw – NL Hegyhatsal – HU In Transcom continuous: Fluxes of fossil fuel are constant over the year (1x1 degree res) Sib fluxes give the best results, are shown here Influence of ocean fluxes is quite small for the continental stations Output for more than 100 stations About 10 transport models, will show CE-IP models + 1 American

3. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 3 TM5 REMO TM3vfg

4. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 4 TM5 COMET

5. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 5

6. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 6 All in numbers… StationR2RMSE%stdevStationR2RMSE%stdev REMOCBW200.598013.5118HUN100.446410.6121 CBW600.570610.4156HUN480.38779.6140 CBW1200.59848.8105HUN820.364810.278 CBW2000.60317.6120HUN1150.545110.994 COMETCBW20 HUN10 CBW600.670610.6179HUN480.55498.6183 CBW120 HUN82 CBW200 HUN115 TM5CBW200.72436.383HUN100.496110.1146 CBW600.71527.387HUN480.56508.1116 CBW1200.72548.393HUN820.54528.697 CBW2000.690011.994HUN1150.63426.4109 LMDZthCBW200.62867.366HUN100.411211.075 CBW600.57599.060HUN480.44049.283 CBW1200.597610.160HUN820.47539.372 CBW2000.482115.451HUN1150.53637.284 TM3vfgCBW200.516014.856HUN100.349011.585 CBW600.60789.972HUN480.45329.198 CBW1200.63248.370HUN820.42749.793 CBW2000.64567.280HUN1150.52667.3106 LMDZCBW200.405316.557HUN100.349011.585 CBW600.595810.172HUN480.45329.198 CBW1200.59008.975HUN820.42749.793 CBW2000.62127.474HUN1150.52667.3106 AM2CBW200.367817.059HUN100.368411.385 CBW600.502311.270HUN480.41459.499 CBW1200.52729.579HUN820.324610.583 CBW2000.5600883HUN1150.48407.6101

7. CarboEurope-IP: Open Science Conference on the GHG Cycle in the Northern Hemisphere, Crete, Nov 2006 Transcom continuous: comp. with obs at CBW and HUN 7 Conclusions Exercise demonstrates big progress in modelling: higher resolution models represent the tall tower sites quite well: models agree more than less! CBW is predicted to be dominated by fossil fuel fluxes, still influence of biosphere is detectable CBW is represented better in the models than HUN Still significant differences between models despite equal input fluxes More detailed study will be needed to look at: influence of vertical resolution+diffusion scheme other surface station data Tall tower data + models form great combination for update on flux schemes Potential for increased perfomance when fluxes are optimised (COMET CH 4 : R 2 =0.9; CO 2 : R 2 =0.6)