Variations in the size of the Sahara Desert from 1980 to 1997

Ambio

Volumn 28, Issue 7, 1999, Pages 587-591

  Tucker, Compton J ^a   Nicholson, Sharon E ^b  

^a NASA GODDARD SPACE FLIGHT CENTER   (United States)

^b FLORIDA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DESERTIFICATION; SATELLITE IMAGERY; SPATIOTEMPORAL ANALYSIS;

AFRICA;

EID: 0033390778     PISSN: 00447447     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (49)

1. Dregne, H.E. and Tucker, C. J. 1988. Desert encroachment. Desertif. Contr. Bull. 23, 243-251.
2. Helldén, U. 1988. Desertification monitoring: Is the desert encroaching? Desertif. Contr. Bull. 17, 8-12.
3. Helldén, U. 1991. Desertification - time for an assessment? Ambio 20, 372-383.
4. Kutzbach, J., Bonan, G., Foley, J. and Harrison, S.P. 1996. Vegetation and soil feedbacks on the response of the African monsoon to orbital forcing in the early to middle Holocene. Nature 384, 623-626.
5. Le Houerou, H.N. 1980. The rangelands of the Sahel. J. Range Mgmt 33, 41-46.
6. Monod, T. 1986. The Sahel zone north of the equator. In: Ecosystems of the World, Hot Deserts and Arid Shrublands. Evenari, M., Noy-Meir, I. and Goodall, D.W. (eds). Elsevier, New York, pp. 203-243.
7. White, F. 1983. The Vegetation of Africa, UNESCO, Paris.
8. Bremen, H. and de Wit, C.T. 1983. Rangeland productivity and exploitation in the Sahel. Science 221, 1341-1347.
9. Le Houerou, H.N. 1968. La desertisation du Sahara septentrional et des steppes limitrophes, Ann. Alger. Geogr. 6, 2-21.
10. Charney J., Stone, G., and Quirk, W.J. 1975. Drought in the Sahara, a biophysical feedback mechanism. Science 187, 434-435.
11. Nicholson, S.E., Tucker, C.J. and Ba, M.B. 1998. Desertification, drought and surface vegetation, an example from the West African Sahel. Bull. Am. Meteorol. Soc. 79, 815-829.
12. Lamprey, H.F. 1988. Report on the desert encroachment reconnaissance in northern Sudan, 21 October to 10 November 1975. UNESCO/UNEP, Paris/Nairobi, 16 p.; republished in Desertif. Contr. Bull. 17, 1-7.
13. Helldén, U. 1984. Drought impact monitoring. Rapporter och Notiser 61. Lunds Universitets Naturgeografiska Institution, Lund, Sweden, 61 pp.
14. Aubreville, A., Patterson, J.R., Collier, F.S., Dundas, J., Jones, B., Mathey, J. and Bachelier, R. 1973. Rapport de la mission forestiere Anglo-Francaise Nigeria-Niger (decembre 1936 - fevrier 1937). Bois Forets Tropiques 118, 3-26.
15. Bovill, E. 1921. The encroachment of the Sahara on the Sudan. J. Roy. Afr. Soc. 20, 175-185.
16. Cana, F.R. 1915. The Sahara in 1915. Geogr. J. 46, 333-357.
17. Cloudsley-Thompson, J. L. 1974. The expanding Sahara. Environ. Conserv. 1, 5-13.
18. Eckholm, E. and Brown, L.R. 1977. Spreading Deserts, the Hand of Man. Worldwatch Paper 13 (Worldwatch Institution, Washington, DC), 40 pp.
19. Kassas, M. 1970. Desertification versus potential for recovery in circum-Sahara territories. In: Arid Lands in Transition. Dregne, H.E. (ed.). (Am. Assoc. Adv. Sci., Washington, DC), pp. 123-142.
20. Rodd, F. 1938. The Sahara. Geogr. J. 91, 354-355.
21. Stebbing, E.P. 1935. The encroaching Sahara, the threat to the West African colonies. Geogr. J. 85, 506-524.
22. Stebbing, E.P. 1938. The advance of the Sahara. Geogr. J. 91, 356-359.
23. Tucker, C.J., Dregne, H.E. and Newcomb, W.W. 1991. Expansion and contraction of the Sahara Desert from 1980 to 1990. Science 253, 299-301.
24. Lauenroth, W.K. 1979. Grassland primary production, North American grasslands in perspective. In: Perspectives in Grassland Ecology, by French, N. (ed.). Springer-Verlag, New York, pp. 3-24.
25. Rutherford, M.C. 1980. Annual plant production-precipitation relations in arid and semi-arid regions. S. Afr. J. Sci. 76, 53-56.
26. Seely, M.K. 1978. Grassland productivity, The desert end of the curve. S. Afr. J. Sci. 74, 295-297.
27. Le Houerou, H.N. and Hoste, C.H. 1977. Rangeland production and annual rainfall relations in the Mediterranean Basin and in the African Sahelo-Sudanian Zone. J. Range Mgmt 30, 181-189.
28. Tucker, C.J. 1979. Red and photographic infrared linear combinations for monitoring vegetation. Remote Sensing Environ. 8, 127-150.
29. Curran, P.J. 1983. Multi-spectral remote sensing for the estimation of green leaf area index, Phil. Trans. Roy. Soc. A309, 257-270.
30. Tucker, C.J. and Sellers, J. 1986. Satellite remote sensing of primary production. Int. J. Remote Sensing 7, 1395-1416.
31. Sellers, P.J. 1985. Canopy reflectance, photosynthesis, and transpiration. Int. J. Remote Sensing 6, 1335-1372.
32. Monteith, J.L. 1977. Climate and the efficiency of crop production in Britain. Phil. Trans. Roy. Soc. B-281, 277-294.
33. Hatfield, J.L., Asrar, G. and Kanemasu, E.T. 1984. Intercepted photosynthetically active radial ion in wheat canopies estimated by spectral reflectance. Remote Sensing Environ. 14, 65-75.
34. Daughtry, C.S.T., Galio, K.P. and Bauer, M.E. 1983. Spectral estimates of solar radiation intercepted by corn canopies. Agron. J. 75, 527-531.
35. Asrar, G., Kanemasu, E.T., Miller, G.P. and Weiser, R.L. 1986. Light interception and leaf area estimates from measurements of grass canopy reflectance. IEEE Trans. Geosci. Remote Sensing GE24, 75-82.
36. Tucker, C.J., Holben, B.N., Elgin, J.H. and McMurtrey, J.E. 1981. Remote sensing of total dry matter accumulation in winter wheat. Remote Sensing Environ. 11 , 171-189.
37. Asrar, G., Kanemasu, E.T., Jackson, R.D. and Pinter, P.J. 1985. Estimation of total above-ground phytomass production using remotely sensed data. Remote Sensing Environ. 17, 211-220.
38. Tucker, C.J., Vanpraet, C.L., Sharman, M.L. and Van Ittersum, G. 1985. Satellite remote sensing of total herbaceous biomass production in the Senegalese Sahel, 1980-1984. Remote Sensing Environ. 17, 233-249.
39. Gosse, G., Varlet-Grancher, C., Bonhomme, R., Chartier, R., Allirand, J.M. and Lemaire, G. 1986. Production maximale de matière sèche et rayonnement solaire intercepté par le végétal. Agronomie 6, 47-56.
40. Prince, S.D. 1991. Satellite remote sensing of primary production, comparison of results for Sahelian grasslands 1981-1988. Int. J. Remote Sensing 12, 1301-1312.
41. Holben, B.N. 1986. Characteristics of maximum-value composite images from temporal AVHRR data. Int. J. Remote Sensing 7, 1417-1434.
42. Kaufman, Y.J. and Holben, B.N. 1993. Calibration of the AVHRR visible and near-IR bands by atmospheric scattering, ocean glint, and desert reflection. Int. J. Remote Sensing 14, 21-52.
43. Vermote, E. and Kaufman, Y.J. 1996. Absolute calibration of AVHRR visible and near-infrared channels using ocean and cloud views. Int. J. Remote Sensing 16, 2317-2340.
44. Los, S.O. 1993. Calibration adjustment of the NOAA AVHRR normalized difference vegetation index without recourse to component channel 1 and 2 data. Int. J. Remote Sensing 14, 1907-1917.
45. Tucker, C. J., Newcomb, W.W. and Dregne, H. E., 1994. AVHRR data sets for determination of desert spatial extent. Int. J. Remote Sensing 15, 3547-3566.
46. Nicholson, S.E. 1993. An overview of African rainfall fluctuations of the past decade. J. Climate 6, 1463-1466.
47. Nicholson, S.E., Ba, M.B., and Kim, J.Y. 1996. Rainfall in the Sahel during 1994. J. Climate 9, 1673-1676.
48. This work was supported by NASA's Earth Science Enterprise and by the U. S. Agency for International Development's PASA # AOT-P-00-97-00362-00 to NASA/Goddard Space Flight Center for work on the Famine Early Warning System for Africa.
49. First submitted 25 May 1998. Accepted for publication after revision 9 October 1998.