1. Fluxnet 2009 Progress
Dennis Baldocchi, Rodrigo Vargas, Youngryel Ryu, Markus Reichstein, Dario Papale, Deb Agarwal, Catharine Van Ingen, Bob Cook
GEWEX Meeting, Melbourne Australia

2. FLUXNET Community Outreach
NewsLetter, FluxLetter
Workshops
LaThuile, Feb. 2007
Asilomar, Feb 2009
Distributed, Searchable Database,
250 + sites; 950+ site-years
Coordinating Synthesis Projects and Papers
Fluxnet Visitors
Paul Stoy, Sebastiaan Luyssaert, Josep Penuelas, Bart Kruijt

3. FLUXNET DataBase, www.fluxdata.org
QA/QC
Data Standardization (names, units)
Version Control
Flux Integrals Computed
Daily, Monthly, Annual
U* corrections
Gap-Filling
Flux Partitioning
Converting NEE into GPP and Reco
Compiling Multi-faceted Site MetaData
Data
Searchable/Distributed/Manipulatable/Archived
Curating, wikis, community feedback

4. Emerging Ideas, Science Beyond Routine Flux Measurements: Products from the New and Expanding Database
Carbon Fluxes
Flux Spectra From Hours to Decade
PhotoDegradation
Mycorrhyzae
Site MetaData Syntheses
Leaf clumping, albedo and N
Ecohydrology and Water Fluxes
Water Use Efficiency
Revisiting Budyko and Priestley-Taylor
Continental/Global Upscaling of Evaporation in Time/Space
Model Data Assimilation

5. Many Scales of Flux Variance
Results demonstrate that the NEE and GEP
wavelet spectra are similar amongst plant functional types (PFT) at weekly and shorter time
scales, but significant divergence appeared among PFT at the biweekly and longer time scales,
at which NEE and GEP are relatively less variable than climate. The RE spectra rarely differ
among PFT across time scales. On average, RE spectra had greater low frequency (monthly to
interannual) variability than NEE, GEP and climate….stress need to understand biology rather than climate at longer time scales
The broader implications of this study suggest that, at shorter (hourly to weekly) time scales,
the variability of C uptake across global ecosystems responds to climatic inputs in a similar
matter regardless of PFT as revealed by the spectral analyses
Ecosystem Respiration has more Energy at low frequencies than NEE and GPP
Wavelet Spectrum emphasizes need for Long data record to disentangle
biology from climate at multi-year time scales
Data for Validating Models at long time scales
Paul Stoy et al, Biogeosciences, to be submitted

6. What Happens to the Grass? The Soil is Too Dry to Sustain Respiration
June
October

7. Separating Plants and Soil: Ecosystem Minus Soil CO2 Efflux
Summer Dry Period, Dead Grass and Dry Soil
Baldocchi, Ma, Rutledge

8. PhotoDegradation: A Process Not in Coupled Carbon-Climate Models
Baldocchi, Ma, Rutledge

9. Mycorrhizae Explain Different Connections between Climate and Carbon Flxues
Interannual variations in ecosystem CO2 fluxes at arbuscular dominated sites were primarily controlled by changes in annual precipitation.
Interannual variations in ecosystem CO2 fluxes for ectomycorrhizal dominated sites were primarily controlled by changes in mean annual temperature
Across large geographical distances, interannual variations in ecosystem CO2 fluxes for ectomycorrhizal dominated sites were primarily controlled by changes in mean annual temperature. In contrast, variations in ecosystem CO2 fluxes at arbuscular dominated sites were primarily controlled by changes in annual precipitation.
Our results support and complement the hypothesis that across large geographical distances, bioclimatic conditions strongly influence the distribution and dominance of AM and EM systems. These results provide the first large-scale assessment of terrestrial CO2 fluxes in multiple vegetation types classified according to dominant mycorrhizal association, and provide insights on potential effects of climate change on the global distribution of AM and EM systems.
Vargas et al in press. New Phytologist

10. Albedo and Nutrition
Hollinger et al 2009 Global Change Biology

11. Clumping is Ubitquitous
And Must be Considered when Inverting Radiation transfer
Ryu, Nilson, Kobayashi, Sonnentag, Baldocchi (to be submitted)

12. Water Use Efficiency, Coupling Water and Carbon Fluxes
Beer et al Global Biogeochemical Cycles

13. Test of the Budyko Curve with Evaporation Flux Measurements
Evap Demand >>
Precipitation
Precipitation >>
Evaporation, which
Is energy limited
Ppt/Rn

14. ESPM 129 Biometeorology

15. Explaining Budyko, part I
Canopy Conductance scales with LAI, which scales with Water Budget and Nutrition

16. Priestley-Taylor and Surface Conductance
Evaporation, normalized by Net Radiation, Diminishes with Reduced Conductance
Plot from Chris Williams, Clark Univ

17. Optimizing Seasonality of Vcmax improves Prediction of Fluxes
Wang et al, 2007 GCB

18. Incorporating Soil Evaporation Scheme in CABLE Improves Model Performance
Williams et al Biogeosciences

19. Using Flux Data to produce Global ET maps, V2
ET (mm H2O y-1)
Fig.9 Global Evapotranspiration (ET) driven by interpolated MERRA meteorological data and 0.5º×0.6º MODIS data averaged from 2000 to 2003.
Wenping Yuan

20. Using Flux data to produce Global ET maps, v3
Martin Jung/Markus Reichstein

22. And, WUE scales with LAI and Soil Moisture
Beer et al Global Biogeochemical Cycles

23. Albedo and Climate Forcing
Heat absorbed
Heat reflected
Albedo and Climate Forcing
Savannas
Integrated annual error, or departure in the shortwave energy budget, for each site as derived from the calculated biome mean albedo.
Grasslands
Evergreen
Deciduous
Croplands
Tom O’Hallaran

24. Global ET, 1989, ISLSCP, V1 Mean Global ET: 613 mm/y
Van den Hurk et al 2003 JGR annual average land ET 1.28 kg m-2 d-1…467.2 mm/y; 649 mm/y Boslilovich; 560 mm from Jackson, land ET is 70,000 km3 and assuming ^6 km2 land area
Mean Global ET: 613 mm/y
Fisher et al, Remote Sensing Environment, 2008