The Effects of Model-Generated Climatic Changes due to a CO2 Doubling on Desertification Processes in the Mediterranean Area

  • H. J. Jung
  • W. Bach
Conference paper


For the estimation of a climatic change induced by a doubling of atmospheric CO2 we use the results of three-dimensional general circulation models (GCM). Although the results from present climate modeling cannot be considered as predictions of future climatic conditions due to the inherent models’ deficits, they can still serve a useful purpose in climate change scenarios. The reason for this is that climate models are the only tools available to study the response of the climate system to a perturbation in a physically consistent manner and that such types of models can provide a consistent data set of high temporal and spatial resolution. For the Mediterranean area, the results obtained from three different GCMs, namely, the British Meteorological Office model (BMO), the Goddard Institute of Space Studies model (GISS), and the National Center for Atmospheric Research model (NCAR) are shown. The regional and seasonal distributions of temperature, precipitation, and soil moisture are used to study the potential for desertification. The results indicate that the CO2-induced changes for temperature generated by the three models are quite similar. The values of the area mean change range between 2.5 and 4.2 K. The precipitation response results in a diverse pattern. The physical mechanisms likely to be responsible for the climatic changes are identified and their statistical significance is tested. This type of work will help us develop the methodology and assist us in gaining insight into the use of climate model scenarios for impact analysis.


Soil Moisture General Circulation Model Climatic Change Scenario Ocean Heat Transport Soil Moisture Change 
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  1. 1.
    Bach, W. (1984). Our threatened climate: Ways of averting the CO2-problem through rational energy use, Reidel Publ. Co., Dordrecht.Google Scholar
  2. 2.
    Bach, W., Jung, H.J. and Knottenberg, H. (1984). Developments of regional climate scenarios. In: Socioeconomic impacts of climatic changes, Report for the EEC and the BMFT, Dornier System, Friedrichshafen.Google Scholar
  3. 3.
    Chervin, R.M. (1981). On the comparison of observed and GCM simulated climate ensembles, J. Atmos. Sci. 38, 885–901.CrossRefGoogle Scholar
  4. 4.
    Dennett, M.O., Elston, J. and Diegoq, R. (1980). Weather and yields of tobacco, sugar beet and wheat in Europe, Agr. Meteor., 21, 249–263.CrossRefGoogle Scholar
  5. 5.
    Gates, W.L. (1983). The use of general circulation models in the analysis of the ecosystem impacts of a climatic change. Paper presented at the Study Conference on the sensitivity of ecosystem and society to climatic change, Villach, 19–23 September, 1983.Google Scholar
  6. 6.
    Gates, W.L. and Bach, W. (1981). Analysis of a model simulated climate change as a scenario for impact studies. Report for the German Federal Environmental Agency, R&D No. 104-102-513, 163pp.Google Scholar
  7. 7.
    Hansen, J., Russell, G., Rind, D., Stone, P., Lacis, A., Lebedeff, S., Ruedy, R. and Travis, L. 1983). Efficient three dimensional global models for climate studies: Models I and II, Mon. Wea. Rev. 110, 609–662.CrossRefGoogle Scholar
  8. 8.
    Hansen, J., Lacis, A., Rind, D., Russell, G., Stone, P., Fung, J., Lerner, J., Ruedy, R. (1984). Climate sensitivity experiments with a threedimensional model: Analysis of feedback mechanisms (unpublished manuscript).Google Scholar
  9. 9.
    Katz, R.W. (1982). Statistical evaluation of climate experiments with general circulation models: A parametric time series modeling approach, J. Atmos. Sci. 39, 1446–1455.CrossRefGoogle Scholar
  10. 10.
    Lough, J.M., Wigley, T.M.L. and Palutikof, J.P. (1983). Climate and climate impact scenarios for Europe in a warmer world, J. Cl. and Appl. Meteor., 22, 1673–1684.CrossRefGoogle Scholar
  11. 11.
    Manabe, S. (1969). Climate and the ocean circulation I: the atmospheric circulation and the hydrology of the earth’s surface. Mon. Wea. Rev., 97, 739–774.CrossRefGoogle Scholar
  12. 12.
    Manabe, S., Wetherald, R.T. and Stouffer, R.J. (1981). Summer dryness due to an increase of atmospheric CO2 concentration, Climatic Change 3, 347–386.CrossRefGoogle Scholar
  13. 13.
    Mitchell, J.F.B. (1983a). The seasonal response of a general circulation model to changes in CO2 and sea surface temperature, Q.J.R. Met. Soc. 109, 113–152.CrossRefGoogle Scholar
  14. 14.
    Mitchell, J.F.B. (1983b). The hydrological cycle as simulated by an atmospheric general circulation model. In: A. Street-Perrott et al. (eds.) Variations in the global water budget, 429–446, Reidel Publ. Co., Dordrecht.CrossRefGoogle Scholar
  15. 15.
    Rind, D. (1982). The influence of ground moisture conditions in North America on summer climate as modeled in the GISS GCM, Mon. Wea. Rev., 110, 1487–1494.CrossRefGoogle Scholar
  16. 16.
    Rowntree, P.R. and Bolton, J.A. (1983). Effects of soil moisture anomalies over Europe in summer. In: A. Street-Perrott et al. (eds.) Variations in the global water budget, 447–462, Reidel Publ. Co., Dordrecht.CrossRefGoogle Scholar
  17. 17.
    Schlesinger, M.E. (1983). Simulating CO2-induced climatic change with mathematical climate models: Capabilities, limitations and prospects, III3–III139, US DOE 021, Washington, D.C..Google Scholar
  18. 18.
    US NRC (1983). Changing climate, National Academy Press., Washington, D.C..Google Scholar
  19. 19.
    Washington, W.M. and Meehl, G.A. (1984). Seasonal cycle experiments on the climate sensitivity due to a doubling of CO2 with an atmospheric general circulation model coupled to a simple mixed layer ocean model, J. Geophys. Res. (in press).Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1986

Authors and Affiliations

  • H. J. Jung
    • 1
  • W. Bach
    • 1
  1. 1.Center for Applied Climatology and Environmental Studies, Dept. of GeographyUniversity of MünsterMünsterWest-Germany

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