Abstract
This paper presents probable effects of climate change on soil moisture availability in the Southeast Anatolia Development Project (GAP) region of Turkey. A series of hypothetical climate change scenarios and GCM-generated IPCC Business-as-Usual scenario estimates of temperature and precipitation changes were used to examine implications of climate change for seasonal changes in actual evapotranspiration, soil moisture deficit, and soil moisture surplus in 13 subregions of the GAP. Of particular importance are predicted patterns of enhancement in summer soil moisture deficit that are consistent across the region in all scenarios. Least effect of the projected warming on the soil moisture deficit enhancement is observed with the IPCC estimates. The projected temperature changes would be responsible for a great portion of the enhancement in summer deficits in the GAP region. The increase in precipitation had less effect on depletion rate of soil moisture when the temperatures increase. Particularly southern and southeastern parts of the region will suffer severe moisture shortages during summer. Winter surplus decreased in scenarios with increased temperature and decreased precipitation in most cases. Even when precipitation was not changed, total annual surplus decreased by 4 percent to 43 percent for a 2°C warming and by 8 percent to 91 percent for a 4°C warming. These hydrologic results may have significant implications for water availability in the GAP as the present project evaluations lack climate change analysis. Adaptation strategies – such as changes in crop varieties, applying more advanced dry farming methods, improved water management, developing more efficient irrigation systems, and changes in planting – will be important in limiting adverse effects and taking advantage of beneficial changes in climate.
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References
Gleick, P. H.: 1986, ‘Methods for Evaluating the Regional Hydrologic Effects of Global Climate Changes’, J. Hydrol. 88, 97-116.
Gleick, P. H.: 1987, ‘Regional Hydrologic Consequences of Increases in Atmospheric CO2 and other Trace Gases’, Clim. Change 10, 137-161.
Gribbin, J.: 1984, ‘What on Earth is Happening?’ Sunday Telegraph Magazine, 23-28.
Haan, C. H.: 1977, Statistical Methods in Hydrology, Iowa State University Press. Ames. Iowa.
Hansen, J., Fung, I., Lacis, A., Rind, D., Lebedeff, S., Ruedey, R., and Russel, G.: 1988, ‘Global Climate Changes as Forecast by Goddard Institute for Space Studies Three-Dimensional Model’, J. Geophys. Res. 93(D8), 9341-9364.
Hare, F. K.: 1985, ‘Climatic Variability and Change’, in Climatic Impact Assessment, Wiley, London, pp. 37-68.
IPCC: 1990, Climate Change: The IPCC Scientific Assessment, WMO/UNEP/IPCC, Cambridge University Press, Cambridge, 365 pp.
IPCC: 1995, Climate Change 1995 - Impacts, Adaptations and Mitigation of Climate Change: Scientific-Technical Analyses, Contribution of Working Group II to the Second Assessment Report of the Intergovernmental Panel on Climate Change, WMO/UNEP/IPCC, Cambridge University Press, Cambridge, 878 pp.
Katwijk, V. F., Rango, A., and Childress, A. E.: 1993, ‘Effects of Simulated Climate Change on Snowmelt Runoff Modelling in Selected Basins’, Water Res. Bull. 29(5), 755-765.
Kenny, G. J., Harrison, P. A., Parry, M. L. (eds.): 1993, The Effect of Climate Change on Agricultural and Horticultural Potential in Europe, Environmental Change Unit, University of Oxford, Oxford, U.K., 224 pp.
Kolars, J. F. and Mitchell, W. A.: 1991, The Euphrates River and the Southeast Anatolia Development Project, Southern Illinois University Press, Carbondale and Edwardville, 323 pp.
Legates, D. R. and McCabe, G. J. Jr.: 1991, Reliability of Precipitation Estimates for Doubled-CO2 Scenarios Simulated with Two General Circulation Models, Proceedings of the American Meteorological Society Special Session on Hydrometeorology, Salt Lake City, Utah, pp. 200-203.
Manabe, S. and Wetherald, R. T.: 1980, ‘On the Distribution of Climate Change Resulting from an Increase in CO2-Content of the Atmosphere’, J. Atmos. Sci. 37, 99-118.
Mather, J. R.: 1978, The Climatic Water-Balance in Environmental Analysis, D.C. Heath and Company, Lexington, Massachusetts, 239 pp.
Mather, J. R. and Feddema, J.: 1988, ‘Hydrologic Consequences of Increases in Trace Gases and CO2 in the Atmosphere’, in Effects of Changes in Stratospheric Ozone and Global Climate, Climate Change, U.S. Environmental Protection Agency, 3, pp. 251-271.
McCabe, G. J. and Ayers, M. A.: 1989, ‘Hydrologic Effects of Climate Change on Delawere River Basin’, Water Res. Bull. 25(6), 1231-1241.
Mitosek, H.: 1992, Occurrence of Climatic Variability and Change Within the Hydrological Time Series, A Statistical Approach, IIASA, Laxenburg, Austria.
Morison, J. I. L.: 1987, ‘Intercellular Carbon Dioxide Concentration and Stomatal Response to Carbon Dioxide’, 229-251, Stomatal Function, Stanford University Press, California, 503 pp.
Rao, G. Appa: 1987, Drought Probability Maps, CAgM Report No. 24,WMO, Geneva, Switzerland, 45 pp.
Schaake, J. C.: 1989, ‘Climate Change and U.S.Water Resources’, in Waggoner, P. E. (ed.), Climate to Flow(Chapter 8), Wiley, New York, pp. 177-218.
Schneider, S. H. and Thompson, S. L.: 1981, ‘Atmospheric CO2 and Climate: Importance of the Transient Response’, J. Geophys. Res. 86, 3135-3147.
Schneider, S. H.: 1989, ‘The Changing Climate’, Scient. Amer. 9, 70-79.
Thornthwaite, C. W. and Mather, J. R.: 1955, ‘The Water Balance, Publications in Climatology’, Laboratory of Climatology 8(1).
Thornthwaite, C.W. and Mather, J. R.: 1957, ‘Instructions and Tables for Computing Potential Evapotranspiration and the Water Balance’, Publications in Climatology, Laboratory of Climatology 10(3).
Warrick, R. A.: 1988, ‘Carbon Dioxide, Climatic Change and Agriculture’, Geogr. J. 154, 221-233.
Williams, M. A. J. and Balling, R. C.: 1993, Interactions of Desertification and Climate, World Meteorological Organization, Geneva, Switzerland, 230 pp.
Willmott, C. J.: 1977, Watbug: A Fortran Algorithm for Calculating the Climatic Water Budget, Water Resources Center, University of Delaware, Newark, 55 pp.
World Meteorological Organization: 1994, WMO Statement on the Status of the Global Climate in 1993, Technical Note 809, WMO, Geneva, Switzerland, 20 pp.
World Meteorological Organization: 1995, WMO Statement on the Status of the Global Climate in 1994, Technical Note 826, WMO, Geneva, Switzerland, 20 pp.
World Meteorological Organization: 1996, WMO Statement on the Status of the Global Climate in 1995, Technical Note 838, WMO, Geneva, Switzerland, 18 pp.
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Komuscu, A.U., Erkan, A. & Oz, S. Possible Impacts of Climate Change on Soil Moisture Availability in the Southeast Anatolia Development Project Region (GAP): An Analysis from an Agricultural Drought Perspective. Climatic Change 40, 519–545 (1998). https://doi.org/10.1023/A:1005349408201
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DOI: https://doi.org/10.1023/A:1005349408201