Terrestrial biosphere and global change: the carbon cycle at the land surface Han Dolman [ Wageningen, NL
Bottom up: forest inventories, models Top Down: atmospheric methods The Dual constraint approach for carbon balances
The Global Carbon Cycle Atmosphere 750, + 3 per year Deforestation Terrestrial production & respiration Fossil fuels & cement production Oceanic exchange Terrestrial ecosystem Vegetation 610 Soils1400 Litter 60 _____________ Total2070 Surface ocean 1020 Marine biota 3 DOC 700 Ocean 38,100 Sediment 0.4 Fossil fuel reserves 4000 Carbonate rocks 65x
Interannual variability
A global network
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
CO 2 eddy fluxes over 2 years in the Central and Southern Amazon Data are 10-day averages. Missing data are green or dark blue
Manaus: slight sesaonality
Rebio Jaru: Seasonality
Annual C-uptake in the Amazon
Monthly NEE Loobos
Interannual variability in NEE Loobos
What is causing the variation in NEE? Radiation load Length of growing season
Growing season length
Conservation between carbon and water fluxes (WUE)
Coupling of H 2 0-CO 2 flux at ecosystem level
The Carbon Balance of a Forest
Land Use Change
Flask sampling Weather Fossil fuel emission Biospheric uptake Flux aircraft Free troposphere CO2 Landscape scale monitoring m C/dt+uM m C/ x+vM m C/ y = (C i -C m )/ t -W i ) I / m -A-R+M m C f / t
Future: regional integration?
CarboEurope - Flux Monitoring Sites 32 eddy correlation flux measurement towers 8 sites with process studies 5 with aircraft CO 2 profiles 7 chronosequences In addition (not shown): 10 stations of background atmospheric CO 2 monitoring plus 10 stations from NOAA / CMDL