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Terrestrial biosphere and global change: the carbon cycle at the land surface

Terrestrial biosphere and global change: the carbon cycle at the land surface . Han Dolman [ dola@geo.vu.nl ] Alterra Wageningen, NL. Top Down: atmospheric methods. The Dual constraint approach for carbon balances. Bottom up: forest inventories, models. The Global Carbon Cycle.

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Terrestrial biosphere and global change: the carbon cycle at the land surface

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  1. Terrestrial biosphere and global change: the carbon cycle at the land surface Han Dolman [dola@geo.vu.nl] Alterra Wageningen, NL

  2. Top Down: atmospheric methods The Dual constraint approach for carbon balances Bottom up: forest inventories, models

  3. The Global Carbon Cycle Atmosphere 750, + 3 per year 60 6.5 90 cement production Fossil fuels & Deforestation & respiration Terrestrial production Oceanic exchange 1 -1.5 62 - 63 92 Terrestrial ecosystem Surface ocean Vegetation 610 1020 0.4 Soils 1400 Litter 60 92 40 50 100 _____________ Ocean Marine biota 4 Total 2070 38,100 3 Fossil fuel reserves 6 0.2 6 4000 DOC Sediment 700 Carbonate rocks 6 65x10

  4. Interannual variability

  5. A global network

  6. Brasil: LBA-EUSTACH Sites Manaus K34 and Manaus C14 Caxiuana Rebio Jaru Fazenda Nossa Senhora

  7. Towers at Reserva Biologica do Rio Jaru ‘Abracos’ New tower

  8. CO2 eddy fluxes over 2 years in the Central and SouthernAmazon Data are 10-day averages. Missing data are green or dark blue

  9. Manaus: slight sesaonality

  10. Rebio Jaru: Seasonality

  11. Annual C-uptake in the Amazon

  12. Monthly NEE Loobos

  13. Interannual variability in NEE Loobos

  14. What is causing the variation in NEE? Length of growing season Radiation load

  15. Growing season length

  16. Conservation between carbon and water fluxes (WUE)

  17. Coupling of H20-CO2 flux at ecosystem level

  18. The Carbon Balance of a Forest

  19. Land Use Change

  20. Landscape scale monitoring MmdC/dt+uMmdC/dx+vMmdC/dy = (Ci-Cm)/dt-Wi) I/m-A-R+MmdCf/dt Free troposphere CO2 Weather Flask sampling Flux aircraft Fossil fuel emission Biospheric uptake

  21. Future: regional integration?

  22. CarboEurope - Flux Monitoring Sites • 32 eddy correlation flux measurement towers • 8 sites with process studies • 5 with aircraft CO2 profiles • 7 chronosequences • In addition (not shown): • 10 stations of background atmospheric CO2 monitoring • plus 10 stations from • NOAA / CMDL

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