Regional trends in the land carbon cycle and the underlying mechanisms over the period, 1980-2009 S. Sitch, P. Friedlingstein, G. Bonan, P. Canadell, P. Ciais, P.M. Cox, P. Foster, E. Gloor, K. Goldewijk, C. Huntingford, G. Hurtt, C. D. Jones, S. Piao, I.C. Prentice, C. Le Quere, P. Levy, M. R. Lomas, L. Mercado, B. Mueller, M. Reichstein, S. Running, S. I. Seneviratne, E. Shevliakova, P. Thornton, N. Viovy , G. van der Werf, F. I. Woodward, S. Zaehle, M. Zhao
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Regional trends in the land carbon cycle and the underlying mechanisms
over the period, 1980-2009
S. Sitch, P. Friedlingstein, G. Bonan, P. Canadell, P. Ciais, P.M. Cox, P. Foster, E. Gloor, K. Goldewijk, C. Huntingford, G. Hurtt, C. D. Jones, S. Piao, I.C. Prentice, C. Le Quere, P. Levy, M. R. Lomas, L. Mercado, B.
Mueller, M. Reichstein, S. Running, S. I. Seneviratne, E. Shevliakova, P. Thornton, N. Viovy , G. van der Werf, F. I. Woodward, S. Zaehle, M. Zhao
Photosynthesis
CO2
Plant respiration
CO2
CO2
Soil respiration
(heterotrophic)
RH
Net ecosystem exchange NEE
Terminology
Net Primary productivity (NPP)=
GPP-Plant respiration
RH - NPP
Gross Primary productivity (GPP)=
Photosynthesis +leaf respiration
Total CO2 emissions
Atmosphere
Data: NOAA, CDIAC; Le Quéré et al. 2009, Nature-geoscience
CO2 P
artit
ioni
ng (P
gC y
-1)
1960 20101970 1990 20001980
10
8
6
4
2
Key Diagnostic of the Carbon CycleEvolution of the fraction of total emissions that remain in the atmosphere
Fate of Anthropogenic CO2 Emissions (2000-2008)
Le Quéré et al. 2009, Nature-geoscience; Canadell et al. 2007, PNAS, updated
1.4 PgC y-1
+7.7 PgC y-1
3.0 PgC y-1
29%
4.1 PgC y-1
45%
26%2.3 PgC y-1
Modelled Natural CO2 Sinks
Le Quéré et al. 2009, Nature-geoscience
Global Annual Budget Regional Trends in Land C-Sinks (Trendy)Compare DGVM-based estimates with other
evidence- Satellite derived data
- Fluxtower data
- Atmospheric Monitoring Stations
Regional Trends in C-sinks and Annual Global Budget
GCP- Land trends: modelling protocol Contact: Stephen Sitch ([email protected]) & Pierre Friedlingstein ([email protected])Goal: To investigate the trends in NEE over the period 1980-2009