Location of Repository

The inter-annual variability of Africa's ecosystem productivity: a multi-model analysis

By U. Weber, M. Jung, M. Reichstein, C. Beer, M. Braakhekke, V. Lehsten, D. Ghent, Jörg Kaduk, N. Viovy, P. Ciais, N. Gobron and C. Rödenbeck

Abstract

We are comparing spatially explicit process-model based estimates of the terrestrial carbon balance and its components over Africa and confront them with remote sensing based proxies of vegetation productivity and atmospheric inversions of land-atmosphere net carbon exchange. Particular emphasis is on characterizing the patterns of interannual variability of carbon fluxes and analyzing the factors and processes responsible for it. For this purpose simulations with the terrestrial biosphere models ORCHIDEE, LPJ-DGVM, LPJ-Guess and JULES have been performed using a standardized modeling protocol and a uniform set of corrected climate forcing data. \ud \ud While the models differ concerning the absolute magnitude of carbon fluxes, we find several robust patterns of interannual variability among the models. Models exhibit largest interannual variability in southern and eastern Africa, regions which are primarily covered by herbaceous vegetation. Interannual variability of the net carbon balance appears to be more strongly influenced by gross primary production than by ecosystem respiration. A principal component analysis indicates that moisture is the main driving factor of interannual gross primary production variability for those regions. On the contrary in a large part of the inner tropics radiation appears to be limiting in two models. These patterns are partly corroborated by remotely sensed vegetation properties from the SeaWiFS satellite sensor. Inverse atmospheric modeling estimates of surface carbon fluxes are less conclusive at this point, implying the need for a denser network of observation stations over Africa

Publisher: Copernicus Publications
Year: 2009
DOI identifier: 10.5194/bgd-5-4035-2008
OAI identifier: oai:lra.le.ac.uk:2381/8976
Journal:

Suggested articles

Preview

Citations

  1. (1997). (Eds.): Plant Functional Types, doi
  2. (2005). A 53-year data set for land surface models, doi
  3. (1980). A biogeochemical model of photosynthesis in leaves of C3 species. doi
  4. (2005). A dynamic global vegetation model for studies of the coupled atmosphere biosphere system, doi
  5. (2005). A generalized, bioclimatic index to predict foliar phenology in response to climate, doi
  6. (1984). A Theory of Forest Dynamics: The Ecological Implications of Forest Succession Models, doi
  7. (2000). Advanced vegetation indices optimized for up-coming sensors: Design, performance, and applications, doi
  8. (2007). Africa and the global carbon cycle, doi
  9. (2006). Amazon rainforests green-up with sunlight in dry season, doi
  10. (1996). An integrated biosphere model of land surface processes, terrestrial carbon balance and vegetation dynamics, doi
  11. (2003). Analyzing the causes and spatial pattern of the European doi
  12. (2003). Carbon in Amazon Forest: Unexpected Seasonal Fluxes and Disturbance – Induced Losses.
  13. (2007). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Changem, edited by: doi
  14. (2006). Climate-carbon cycle feedback analysis: Results from the (CMIP)-M-4 model intercomparison, doi
  15. (2003). Cloud cover limits net CO2 uptake and growth of a rainforest tree during tropical rainy seasons, doi
  16. (2005). Comparing and evaluating process-based ecosystem model predictions of carbon and water fluxes in major European forest biomes, doi
  17. (2003). Continental-scale comparisons of terrestrial carbon sinks estimated from satellite data and ecosystem modeling 1982–1998, doi
  18. (1990). Deforestation history of the eastern rain forests of Madagascar from satellite images, doi
  19. (2006). Detecting leaf phenology of seasonally moist tropical forests in South America with multi-temporal MODIS images, Remote Sens. doi
  20. (2007). Determinants of terrestrial ecosystem carbon balance inferred from European eddy covariance flux sites, doi
  21. (2006). Development of a 50-year High Resolution Global Dataset of Meteorological Forcings for Land Surface Modeling, doi
  22. (2008). Diagnostic assessment of European gross primary production, doi
  23. (2005). Estimating CO2 sources and sinks from atmospheric mixing ratio measurements using a global inversion of atmospheric transport.
  24. (2003). Evaluation of ecosystem dynamics, plant geography and terrestrial carbon cycling in the LPJ dynamic global vegetation model, doi
  25. (2008). Global fire activity patters (1996–2006) and climatic influence: an analysis using the World Fire Atlas, doi
  26. (2007). Global Fire Emissions Database, doi
  27. (2001). Global response of terrestrial ecosystem structure and function to CO2 and climate change: results from six dynamic global vegetation models, doi
  28. (1996). IGBP-DIS soil data set for pedotransfer function development, Working paper and
  29. (2000). Impact of ENSO on East African ecosystems: a multivariate analysis based on climate and remote sensing data, doi
  30. (1982). Increases in Global Terrestrial Net Primary Production from doi
  31. (1997). Interannual variability in global biomass burning emission from doi
  32. (1999). Interannual variability in terrestrial net primary production: Exploration of trends and controls on regional to global scales, doi
  33. (2008). Interannual variability of photosynthesis across Africa and its attribution, doi
  34. (1969). Net Radiation to Various Surfaces, doi
  35. (1984). Nutrient Cycling, and Nutrient Limitation in Tropical Forests, doi
  36. (1994). On the temperature dependence of soil respiration, doi
  37. (2001). Representation of vegetation dynamics in the modelling of terrestrial ecosystems: comparing two contrasting approaches within European climate space, doi
  38. (2000). Satellite – Observed Sensitivity of World Land Ecosystems to El Nin˜o/La Nin˜a, Remote Sens. doi
  39. (1996). Satellite based identification of linked vegetation index and sea surface anomaly areas from 1982–1990 for Africa, doi
  40. (2002). The NCEP–NCAR 50-Year Reanalysis: Monthly Means CD-ROM and Documentation. doi
  41. (2001). The role of fire disturbance for global vegetation dynamics: coupling fire into a Dynamic Global Vegetation Model, Global Ecol. doi
  42. (2003). The state of vegetation doi
  43. (1998). The Tropical Rainfall Measuring Mission (TRMM) sensor package, doi
  44. (2003). Uncertainties in Precipitation and Their Impacts o Runoff Estimates, doi
  45. (2009). www.biogeosciences.net/6/285/2009/ U. Weber et al.: Interannual variability of Africas ecosystem productivity 295 doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.