Abstract
The present study uses the general circulation model of the Laboratoire de Météorologie Dynamique (LMD-GCM) coupled to the land-surface, vegetation model SECHIBA. The impact of deforestation on climate is discussed. Replacing tropical forests by degraded pastures changes albedo, the roughness length and the hydrological properties of the surface. The experiment was carried out over eleven years using the observed sea surface temperature from 1978 to 1988, which includes two major El Niño events. The discussion of the results in this study is limited to the regional impact of deforestation. The changes found for the surface fluxes in Amazonia, Africa and Indonesia are examined in detail and compared in order to understand the impact on temperature. Special attention is paid to feedback mechanisms which compensate for the surface changes and to the statistical significance of these results within the tropical variability of climate. It is shown that the relatively small regional impact of deforestation in this study is statistically significant and largely independent of the El Niño-Southern Oscillation phenomenon.
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References
Bunker A (1976) Computations of surface energy flux and annual air-sea interaction cycles of the north atlantic ocean. Mon Weather Rev 104:1122–1140
Chu P-S (1991) Brazil's climate anomalies and ENSO. In: Glantz M, Katz R, Nicholls N (eds) Teleconnections linking worldwide climate anomalies. Cambridge University Press, Cambridge, UK, pp 43–72
Conover W (1980) Practical nonparametric statistics, (2dn) John Wiley, New York, pp 357–363
Dickinson RE, Henderson-Sellers A (1988) Modelling tropical deforestation: a study of GCM land-surface parametrizations. Quart J R Meteorol Soc 114:439–462
Dorman J, Sellers P (1989) A global climatology of albedo, roughness length and stomatal resistance for atmospheric general circulation models as represented by the simple biosphere model (SiB). J Appl Meteorol 28:833–855
Ducoudré N, Laval K, Perrier A (1993) SECHIBA, a new set of parametrizations of the hydrologic exchanges at the land/atmosphere interface within the LMD atmospheric general circulation model. J Clim 6(2):248–273
Figueroa S, Nobre CA (1990) Precipitation distribution over central and western tropical South America. Climanàlise 5:36–45
Golitsyn G, Grachov A (1986) Free convection of multicomponent media and parametrization of air-sea interaction at light winds. Ocean-Air Interact 1:57–78
Harzallah A, Sadourny R (1994) Internal versus SST-forced variability as simulated by an atmospheric general circulation model. J Clim (accepted)
Henderson-Sellers A, Dickinson RE, Durbridge T, Kennedy P, McGuffie K, Pitman A (1993) Tropical deforestation: modelling local and regional-scale climate change. J Geophys Res 98(D4):7289–7315
Hirst A, Hastenrath S (1983) Diagnostics of hydrometeorological anomalies in the Zäire (Congo) basin. Quart J R Meteorol Soc 109:879–890
Houghton J, Jenkins J, Ephraums J (eds) (1990) Climate change, the IPCC scientific assessment. Cambridge University Press, Cambridge, UK, pp 194–239
Hulme M (1992) A 1951–80 global land precipitation climatology for the evaluation of general circulation models. Clim Dyn 7:57–72
Kendall M, Stuart A (1968) The advanced theory of statistics. Griffin, London, Vol 111, p 357
Lau N-C (1985) Modeling the seasonal dependence of the atmospheric response to observed El Niños in 1962–76. Mon Weather Rev 113:1970–96
Laval K, Picon L (1986) Effect of a change of the surface albedo of the Sahel on Climate. J Atmos Sci 43:2418–2429
Le Treut H, Li Z-X (1991) Sensitivity of an atmospheric general circulation model to prescribed SST changes: feedback effects associated with the simulation of cloud optical properties. Clint Dyn 5:175–187
Lean J, Warrilow DA (1989) Simulation of the regional climatic impact of Amazon deforestation. Nature 342:411–413
Nobre C, Sellers P, Shukla J (1991) Amazonian deforestation and the regional climate change. J Clim 4:957–988
Polcher J, Laval K (1994) The impact of African and Amazonian deforestation on tropical climate. J Hydrol 155:389–405
Polcher J, Harzallah A, Bony S, Chalita S, Cohen-Solal E, Forichon M. Hourdin F, LeTreut H, Levan P, Li Z-X, Rogel P (1991) Le cycle 5 du modèle de circulation générale du LMD. Techn Rep LMD Internal Note 170, LMD/ENS 24, rue Lhomond 75231 Paris Cedex 05
Rasmusson E, Carpenter T (1982) Variations in the tropical sea surface temperature and surface wind fields associated with the Southern Oscillation/El Niño. Mon Weather Rev 110:354–384
Reynolds RW (1988) A real-time global sea surface temperature analysis. J Clim 1:75–86
Sadourny R, Laval K (1984) January and July performance of the LMD general circulation model. In: Berger AL, Nicolis C (eds) New perspectives in climate modelling. Elsevier Science Publishers, Amsterdam, pp 173–197
Shukla J, Wallace J (1983) Numerical simulation of the atmospheric response to equatorial Pacific sea surface temperature anomalies. J Atmos Sci 40:1613–1630
Shukla J, Nobre CA, Sellers P (1990) Amazon deforestation and climate change. Science 247:1322–1325
Wright IR, Gash JHC, Da Rochas HR, Shuttleworth WJ, Nobre CA, Maitelli GT, Zamparoni CAGP, Carvalho RPA (1992) Dry season micrometeorology of central Amazonian ranchland. Quart J R Meteorol Soc 118:1083–1099
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Polcher, J., Laval, K. A statistical study of the regional impact of deforestation on climate in the LMD GCM. Climate Dynamics 10, 205–219 (1994). https://doi.org/10.1007/BF00208988
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DOI: https://doi.org/10.1007/BF00208988