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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 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 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
Brasil: LBA-EUSTACH Sites Manaus K34 and Manaus C14 Caxiuana Rebio Jaru Fazenda Nossa Senhora
Towers at Reserva Biologica do Rio Jaru ‘Abracos’ New tower
CO2 eddy fluxes over 2 years in the Central and SouthernAmazon Data are 10-day averages. Missing data are green or dark blue
What is causing the variation in NEE? Length of growing season Radiation load
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
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