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North American Carbon Program Site-level Interim Synthesis Model Data Comparison (Site MDC)

The NACP Site MDC project aims to assess consistency between modeled and observed carbon fluxes at tower sites. Multiple models are used at diverse locations to identify strengths, weaknesses, and quantify uncertainties. The project involves various analyses focusing on carbon, heat fluxes, soil conditions, and isotopes. The goal is to bridge the gap by comparing outputs, emphasizing on model bias and uncertainty. Preliminary results from Howland site simulations show promising outcomes. Visit the provided links for further information and access to model outputs.

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North American Carbon Program Site-level Interim Synthesis Model Data Comparison (Site MDC)

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  1. North American Carbon Program Site-level Interim Synthesis Model Data Comparison (Site MDC) Kevin Schaefer, Peter Thornton, Ken Davis, Dan Ricciuto, Bob Cook, and the NACP Site-Level Interim Synthesis Team

  2. Site MDC Objectives “Are the modeled and observed carbon fluxes consistent with each other - and if not, why?” • Multiple models at multiple towers • 25 priority 1 sites • 34 priority 2 sites • 22 models • Quantify uncertainty • Identify strengths and weaknesses • http://isynth-site.pbwiki.com/

  3. NACP Interim Synthesis Activities • Site MDC • Regional and continental • Mid-Continent Intensive • Non-CO2 Greenhouse Gases • http://nacp.ornl.gov/mast-dc/

  4. Schedule • December, 2007: start planning • October 20, 2008: start model simulations • November 3, 2008: final deadline tower inputs • December AGU: mini-workshop • January 7-9: Full workshop at ORNL • February 17-20: NACP All-Investigators Mtg

  5. Quantifying bias & uncertainty • Multiple analysis teams • Multiple foci: • Fluxes: Carbon, latent heat, sensible heat • Environment: soil temperature & moisture • Isotopes: 13C, 18O, and 15N • Diurnal to inter-annual time scales

  6. Priority 1 Tower Sites Priority 2 Tower Sites

  7. Participating Models

  8. Inputs to Models • Gap-filled observed weather • Filled using nearby towers, NCDC/ASOS sites, and DAYMET data • See Dan Ricciuto poster • MODIS and AVHRR NDVI LAI & fPAR • Standardized fluxes and uncertainty • Filtering and gap-filling • Random error • Systematic error

  9. Inputs to Models • AmeriFlux Biological Data Template • Models physical constants and initial conditions • Full template desirable, high priority list a must • Soil texture, vegetation type • Stand age, species dist., biomass, phenology • Land Use and Disturbance history • Disturbance date and type • Harvest, downfall, crop rotation, irrigation

  10. Output from Models • Standard netcdf output files • Model Survey • Model uncertainty • Parameter estimation • Model structure • Initial conditions

  11. Preliminary Results: Howland NEE Point Simulations with gap-filled weather Date (year) Extracted from regional model results Date (year)

  12. Preliminary Results: Howland Annual NEE

  13. Preliminary Results: Howland GPP Howland: GPP comparison

  14. Preliminary Results: Howland Annual GPP

  15. Conclusions • Thank you! • AmeriFlux, Fluxnet Canada, Fluxnet Synthesis • DOE, CarboEurope, Canadian Carbon program • We anticipate some very cool results

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