Presentation on theme: "CarboEurope Results: Vulnerability of Carbon Sink by Climate Change Chairman Han Dolman Alterra, Wageningen, The Netherlands European Office Annette Freibauer."— Presentation transcript:
CarboEurope Results: Vulnerability of Carbon Sink by Climate Change Chairman Han Dolman Alterra, Wageningen, The Netherlands European Office Annette Freibauer Max-Planck-Institute for Biogeochemistry, Jena, Germany
Ciais et al. West European land uptake:NAO linked?
ECCP Working Group Research, Subgroup Sinks Stockholm Meeting: Sinks in Europe ForestGrasslandArable LandWetland Area (Mio ha) C stock (Pg)6.8? Sink (Pg/y) ? Other GHGssource?sourcesourcesource!
Freeze/Thaw and Ice Affected Regions (Global Freezing Index) Approximate distribution of frost and ice affected regions (i.e. areas with a freezing index > 0). Global freezing index is defined as the cumulative number of degree-days with air temperatures below 0 °C as determined from long-term ( ) mean monthly global surface air temperatures. (Source: Legates and Willmott 1990, courtesy of NSIDC)
Boreal Spring Freeze-Thaw Transition Events from: Running, Way, McDonald, Kimball, Frolking, Keyser and Zimmermann EOS Trans. AGU (1999)
Growing season length critical in boreal systems Example: Northern Finland
Simulated daily net carbon exchange (NEE) accumulation within a mature boreal Picea mariana (black spruce) stand in central Manitoba, Canada (after Frolking et al. 1996). Inter-Annual Variability of Net Carbon Ecosystem Exchange in a Boreal Picea mariana Stand
Interannual variability in NEE in temperate coniferous forest driven by NPP? Example: Scots Pine in NL
/963/964/965/966/967/968/969/96 10/9611/9612/96 1/973/97 4/975/976/977/978/979/97 10/9711/9712/97 1/982/983/984/985/986/987/988/989/98 10/9811/9812/98 date CO 2 soil efflux ( mol m -2 sec ) soil moisture (%Vol.),soil temperature(°C) Sresp RH soil T soil Mediterranean forest: NEE driven by drought limitation of soil respiration? Example: Soil respiration for Q. ilex forest
Carbon sink indicators: Biome-specific change in C stocks and C fluxes Separate indicators for soil and biomass Boreal regions: vulnerability of soil C through temperature rise enhanced NPP through longer growing season risk of high CH4 release from warming wetlands Temperate regions: vulnerability of NPP to extreme events vulnerability of NPP by drought spells Mediterranean regions: drought limitation of soil respiration vulnerability of C stocks by drought and fire