“Biosphere Experiment” Intercomparison of atmospheric CO2 simulations based on biosphere fluxes from different terrestrial ecosystem models U. Karstens,

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Presentation transcript:

“Biosphere Experiment” Intercomparison of atmospheric CO2 simulations based on biosphere fluxes from different terrestrial ecosystem models U. Karstens, P. Peylin and CarboEurope terrestrial biosphere modellers CarboEurope atmospheric transport modellers

“Question” Can we validate / falsify the different terrestrial models with existing continuous European measurements ?

Biosphere experiment Strategy: Forward model simulations of atmospheric CO2 using biosphere fluxes from the model intercomparison in CarboEurope-IP Integration Differences in fluxes —> differences in CO2 concentration Comparison with observations of atmospheric CO2 as additional evaluation of simulated fluxes Problems: Biosphere fluxes are only available for Europe —> complete with ‘standard‘ global biosphere fluxes Sub-daily temporal resolution is needed —> reconstruct diurnal cycle based on REMO hourly radiation

Terrestrial Ecosystem Models daily GPP and respiration or hourly NEE available: models grid time 2002-2005 region 02 03 04 05 ANN 0.25° daily X - Europe BIOME-BGC JULES 1.0° hourly PIXGRO ORCHIDEE global 3-hrly

Forward transport model simulations Global transport models: LMDZ, TM5, TM3 Regional transport models: REMO, DEHM Lagrangian transport model: COMET 2002–2005 CO2 surface fluxes: Biospheric fluxes from CE model intercomparison (Europe) GPP and respiration -> 3-hourly fluxes ‘Standard‘ biospheric fluxes (global) BIOME-BGC, ORCHIDEE Fossil fuel emissions (global) TransCom 2002-2003 Sea-air exchange (global) TransCom 2002-2003

Transport model + different TEMs Hegyhatsal 115m

Transport model + different TEMs Hegyhatsal 115m

HUN (115 m) 2002 2003 Mean across tracers (3 models) 2002 2003 2002 2003 Mean across tracers (3 models) TM5 LMDZ REMO 2002 2003 Mean across models (5 tracers)

HUN (115 m) 2002 2003 Mean across tracers (3 models) 2002 2003 2002 2003 Mean across tracers (3 models) TM5 LMDZ REMO 2002 2003 Mean across models (5*2 tracers)

HUN (115 m) 2002 2003 Mean across tracers (3 models) 2002 2003 2002 2003 Mean across tracers (3 models) TM5 LMDZ REMO 2002 2003 Mean across models (10 tracers)

Standard deviation [ppm] Fossil fuel experiment Biosphere experiment Station Transport Tracer MHD 0.73 0.25 PAL 0.61 0.28 BSC 0.99 0.50 CMN 1.00 0.24 SCH 1.12 0.33 HUN115 1.42 0.60 SAC 2.22 1.15 CBW200 2.30 0.79 Station Transport Tracer MHD - - PAL 2.03 2.71 BSC - - CMN 0.89 1.03 SCH 1.67 1.81 HUN115 1.69 3.17 SAC - - CBW200 - - Transport differences Tracer differences ≈ 2 - 4 Transport differences Tracer differences ≈ 0.6 - 1

REMO+TEM-simulated CO2 July 2003 BIOME-BGC JULES ANN PIXGRO -18 -15 -21 -27 -9 -3 3 9 -24 -6 -12 6 ppm daytime sampled CO2 (bio) at 300 m

REMO+TEM-simulated CO2 July 2003 different fluxes outside Europe ORCHIDEE ORCHIDEE global BIOME-BGC global ORCHIDEE -18 -15 -21 -27 -9 -3 3 9 -24 -6 -12 6 ppm daytime sampled CO2 (bio) at 300 m

Comparison at mountain/tower sites REMO+TEM-simulated CO2 daytime sampled daily mean CO2 (bio+fos +oce)

Comparison at mountain/tower sites seasonal variations filtered daytime sampled daily mean CO2 (bio+fos +oce)

Comparison at mountain/tower sites internal vs. external sources filtered daytime sampled daily mean CO2 (bio+fos +oce)

Comparison at mountain/tower sites seasonal variation relative to Mace Head filtered daytime sampled daily mean CO2 (bio+fos +oce)

Comparison in lower troposphere REMO+TEM-simulated CO2 at 1000 m at 3000 m daytime sampled daily mean CO2 (bio+fos +oce)

Comparison in lower troposphere seasonal variations at 1000 m at 3000 m filtered daytime sampled daily mean CO2 (bio+fos +oce)

Comparison in lower troposphere seasonal variations at 1000 m at 3000 m filtered daytime sampled daily mean CO2 (bio+fos +oce)

Discussion What can we learn ? Next steps: Significant differences in some regions ! Differences due to transport smaller than due to fluxes ! Evaluation of regional TEM fluxes through a comparison of simulated and observed atmospheric CO2 ? Contribution from fluxes inside Europe vs. outside Europe ? Next steps: Evaluate simulations for time period 2002-2005 More models ? ! Feedback to biosphere modellers

Thanks for contributing to the biosphere experiment: Transport modellers: Bakr Badawy Camilla Geels Maarten Krol Christian Rödenbeck Alex Vermeulen Biosphere modellers: Galina Churkina Ralf Geyer Chris Jones Dario Papale John Tenhunen Kristina Trusilova Mona Vetter Nicolas Viovy CarboEurope Experimentalists for providing observation data