Abstract
In order to estimate a transient response of the local hydrological cycle and vegetation cover in the African monsoon area to global climate changes, a simple two-dimensional water vapor transport model coupled with a carbon cycle model for the soil was used. The key difference from other models is that we take into account a positive feedback between the precipitation and development of the vegetation root system in the underlying surface. As our calculation shows, this feedback is responsible for a long-term transient response of local hydrological cycles to the global temperature changes. In the case of a four component vegetation system - tropical forests, savannah, semi desert and desert, (and 2 °C ocean surface water warming), a new steady-state is reached in about 1500 years.
In previous works of other authors, the increase of summer precipitations during Holocene or Last Interglacial could be explained only as a result of the surface temperature increase in the intracontinental parts of Africa. However, from paleodata indicates, the temperature in the intracontinental regions of Africa rather decreased during warm epochs of geological past: Holocene optimum, Last Interglacial and middle Pliocene climatic optimum. Our simple model simulations agree with both paleoprecipitation and paleotemperature data.
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Arakawa, A.: ‘Design of the UCLA General Circulation Model’, Numerical simulation of weather and climate technical report No. 7, Dept. of Met., UCLA.
Atlas of the World Water Balance: 1974, Moscow, Gidrometeoizdat.
Barash, M. S., Oskina, N. S., Ivanova, Ye. I.: 1980, ‘The Upwellings of African Coastal Waters in the Late Pleistocene Studied by the Data on Planktonic Foraminifers’,Oceanology 20, in Russ.
Borzenkova, I. I., 1987, ‘The Features of Moisture Conditions on the Land in the Northern Hemisphere in the Geological Past’,Meteorol. Gidrol. 10, in Russ.
Borzenkova, I. I., 1990, ‘Moisture Conditions in the Arid Regions of the Northern Hemisphere during the Late Glacial-Holocene’,Izv. Acad. Sci. USSR 2, in Russ.
Borzenkova, I. I., Zubakov, V. A., Lapenis, A. G., 1992, ‘Global Climate Changes during the Warm Epochs of the Past’,Meteorol. Gidrol. 8, 25–37, in Russ.
Budyko, M. I.: 1974,Climate and Life, English translation edited by Miller, D. H., Academic Press, N.Y.
Budyko, M. I. and Izrael, Ya. A.: 1991,Anthropogenic Climatic Change, University of Arizona Press, Tucson, pp. 277–318.
Byutner, E. K. and Shabalova, M. V.: 1989, ‘Modeling the Seasonal Course of Hydrologic Cycle Components’,Meteorol. Gidrol. 12, in Russ.
Byutner, E. K. and Shabalova, M. V., 1990, ‘Modeling of Hydrological Cycle in Ocean-Atmosphere-Active Soil Layer system’,Meteorol. Gidrol. 10, in Russ.
Charney, J. C.: 1975, ‘Dynamics of Desert and Drought in the Saheli’,Quart. J. R. Met. Soc. 101, 193. CLIMAP Project Members: 1984, ‘The Last Interglacial Ocean’,Quat. Res. 21, 123-224.
Climate Change, The IPCC Scientific Assessment: 1990, Houghton, J. T., Jenkins, G. J., and Ephraums, J. J. (eds.), Cambridge University Press.
Climate Change in Australia Would Bring Heat and Extreme Rainstorms, Climate Alert 4(4), 1991.
Crowley, T. C.: 1990, ‘Are there Any Satisfactory Geologic Analogs for a Future Greenhouse Warming?’J. Clim. 3, 1282–1292.
Crowley, T. C.: 1991, ‘Modeling Pliocene Warmth’,Quat. Sci. Rev. 10, 275–282.
Eagleson, P. S.: 1982, ‘Land Surface Processes in Atmospheric General Circulation Models’, Cambridge Univ. Press, Cambridge, U.S.A.
Gasse, F.: 1980, ‘Quaternary Changes in Lake-Levels and Diatom Assemblage on the South-Eastern Margin of the Sahara’,Paleoecol. Africa 12, 333–350.
Glenn, A., Goodfriend, M., Magaritz, M., Carmi, I.: 1986, ‘A High Stand of the Dead Sea at the End of the Neolithic Period: Paleoclimatic and Archaeological Implications’,Clim. Change 9(3), 349–356.
Hansen, J.et al.: 1983, ‘Efficient Three-Dimensional Global Models for Climate Studies: Model I and II’,Mon. Wea. Rev. 111(4), 609–662.
Hansen, J.et al.: 1988, ‘Global Climate Changes as Forecast by Goddard Institute for Space Studies Three-Dimensional Model’,J. Geophys. Res. 93(D8).
Hoffert, M. I. and Covey, C.: 1992, ‘Deriving Global Climate Sensitivity from Paleoclimate Reconstructions’,Nature 360, 573–576.
Houghton, J. T.et al. (eds.): 1990,Climate Change: The IPCC Scientific Assessment, Cambridge Univ. Press.
Kellog, W. W. and Zhao, Z.: 1988, ‘Sensitivity of Soil Moisture to Doubling of Carbon Dioxide in Climate Model Experiments’,J. Clim. 1, 348–378.
Kobak, K. I.: 1988, ‘Biotical Compounds of Carbon Cycle’, Leningrad, Gidrometeoizdat, in Russ.
Kutzbach, J. E. and Otto-Bliesner, B. L.: 1982, ‘The Sensitivity of the African-Asian Monsoonal Climate to Orbital Parameter Changes for 9000 Years B.P. in a Low-Resolution General Circulation Model’,J. Atmos. Sci. 39, 1177–1188.
Kutzbach, J. E. and Guetter, P. J.: 1984, ‘The Sensitivity of Monsoon Climates to Orbital Parameter Changes for 9000 Years B.P.: Experiments with the NCAR General Circulation Model’, in Berger, A., Imbrie, J., Hays, J. D., Kukla, G. J., and Saltzmann, B. (eds.),Milankovich and Climate, D. Reidel, Dordrecht, Netherlands, pp. 801–820.
Kutzbach, J. E. and Street-Perrott, F. A.: 1985, ‘Milankovich Forcing of Fluctuations in the Level of Tropical Lakes from 18-0 kyr B.P.’,Nature 317, 130–134.
Manabe, S. and Wetherald, R. T.: 1980, ‘On the Distribution of Climate Change Resulting from an Increase of CO2 Content of the Atmosphere’,J. Atmos. Sci. 37, 99–118.
Murzayeva, I. E., Konopleva, V. I., Devyatkin, Ye. V., Serebryanny, L. R.: 1984, ‘Pluvial Patterns during the Late Pleistocene and Holocene in the Arid Zones of Asia and Africa’,Izv. Acad. Sci. USSR N4, ser. geogr. in Russ.
Petit-Maire, N. and Riser, J. (eds.): 1983,Sahara au Sahel?, Quaternaire recent du Bassin de Taoudenni (Mali), Marseille, Imprimerie Lamy, 473 pp.
Poore, R. Z. and PRISM Project Members: 1993, ‘Pliocene Climate Reconstruction - Mid-Gauss Warming’, Supplement toEOS, April 20, p. 49.
Prell, W. L. and Kutzbach, J. E.: 1987, ‘Monsoon Variability over the Past 150,000 Years’,J. Geophys. Res. 92, 8411–8425.
Rind, D.: 1984, ‘The Influence of Vegetation on the Hydrologic Cycle in a Global Climate Model’, Climate Processes and Climate Sensitivity, Geophysical Monograph 29, Maurice Ewing Volume 5, 73-91.
Sarthein, M.et al.: 1982, ‘Atmospheric and Oceanic Circulation Pattern off Northwest Africa during the Past 25 Million Years’, inGeology of the Northwest African Continental Margin, Springer-Verlag.
Sellers, W. D.: 1965,Physical Climatology, University of Chicago Press, 272 pp.
Shine, K. P.et al.: 1990, in Houghton, J. T., Jenkins, G., and Ephraums, J. J. (eds.),Climate Change: The IPCC Scientific Assessment, Cambridge Univ. Press, pp. 41-68.
Shukla, J. and Mintz, Y.: 1982, ‘Influence of Land-Surface Evapotranspiration on the Earth's Climate’,Science 215, 1498–1501. Strahler, A. N.: 1969,Physical Geography, Wiley, (3d ed.), 733 pp.
Street-Perrot, F. A. and Perrot, R. A.: ‘Abrupt Climate Fluctuations in the Tropics: The Influence of Atlantic Ocean Circulation’,Nature 243, 6259.
Washington, W. M. and Meehl, G. A.: 1984, ‘Seasonal Cycle Experiment on the Climate Sensitivity due to Doubling of CO2 with an Atmospheric General Circulation Model Coupled to a Simple Mixed Layer Ocean Model’,J. Geophys. Res. 89(D6).
Williams, M. A. J., Faure, H. (eds.): ‘The Sahara and the Nile’, A. A. Balkema, Rotterdam.
van Zinderen Bakker, E. M. and Goetzee, J. A.: ‘A Review of Late Quaternary Pollen Studies in East, Central and Southern Africa’,Rev. Paleobot. Palynol. 55, 155–174.
Zubenok, L. I.: 1975, ‘Evaporation on the Continents’, Leningrad, Gidrometeoizdat, in Russ.
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Lapenis, A.G., Shabalova, M.V. Global climate changes and moisture conditions in the intracontinental arid zones. Climatic Change 27, 283–297 (1994). https://doi.org/10.1007/BF01094291
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DOI: https://doi.org/10.1007/BF01094291