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Figure 8.4. Time series of anomalous non-fossil-fuel net land-atmosphere flux from the inversion (solid line, PgC y-1) compared with fire counts compiled by the European Space Agency (dashed line, arbitrary scale), both aggregated over two continental areas (Rödenbeck et al. 2003).







Figure 8.4. Time series of anomalous non-fossil-fuel net land-atmosphere flux from the inversion (solid line, PgC y-1) compared with fire counts compiled by the European Space Agency (dashed line, arbitrary scale), both aggregated over two continental areas (Rödenbeck et al. 2003).

addressed, however, additional carbon fluxes not normally simulated by the ecosystem process models must be included. These include the source-sink patterns of lateral carbon transports by carbon-containing trade products (Tschirley and Servin, Chapter 21, this volume) and through erosion and rivers. In addition, air-sea carbon fluxes in marginal seas and from ocean shelves have to be taken into account (Chen, Chapter 18, this volume). It still remains to be shown that the planned efforts for intense carbon cycle observations in particular regions (e.g., North America [North American Carbon Observation Plan; Wofsy and Harris 2002] or Europe [CarboEurope; Schulze 2003]), together with detailed regional atmospheric modeling, will indeed provide consistent patterns of carbon sources and sinks inferred by the different approaches. Ultimately, the multitude of different data streams on the state of the carbon cycle from the atmosphere, oceans, and terrestrial surface might be merged into a regional or global data assimilation system, similar to the ones employed in current weather forecast models. The development of such a system, however, constitutes a huge challenge for the coming years.

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