These two data sets have been harmonized to construct a unified African data set. Transfer functions were developed from the subsequent training set for inferring past conductivity (r2= 0.87), pH (r2= 0.77), and ratios between alkali and alkaline earth metals (r2 = 0.81) and carbonate-bicarbonate and sulphate + chloride ions (r2 = 0,82) (Gasse et al., 1995) and the model has subsequently been applied to several diatom sequences to reconstruct lake chemistry (e.g. Fritz et al., 1999; Dagnachew et al., in press ; Chalié and Gasse, in press ; Gasse, 2001 ; Gasse, in press ; Verschuren et al., 2000 ).
Full taxon list for this dataset.Full sample list for this dataset.Plot a map of this dataset.
This is a composite dataset derived from the following original datasets:
Summary of environmental data for this dataset:
Publications for this dataset:
Barker, P., Telford, R., Gasse, F., & Thévenon, F.. in press. Late Pleistocene and Holocene paleohydrology of Lake Rukwa, Tanzania, inferred from diatom analysis. Palaeogeography, Palaeoclimatology, Palaeoecology.
Chalié, F. and Gasse, F., in press. A 13,500 years diatom record from the tropical East African Rift Lake Abiyata (Ethiopia). Palaeogeogr., Palaeoclim., Palaeoecol..
Dagnachew Legesse, F. Gasse, O. Radakovitch, C. Vallet-Coulomb, R. Bonnefille, D. Verschuren, E. Gibert, P. Barker. Sous presse. Environmental nvironmental changes in a tropical lake (Abiyata, Ethiopia) during recent centuries. Palaeogeogr., Palaeoclim., Palaeoecol.
Fritz S, Cumming B.F., Gasse F.,Laird K.R., 1999. Diatoms as indicators or Hydrologic and climatic change in saline lakes. In E. Stoermer and J.P. Smol (Eds.) , The Diatoms: Applications to Environmental and Earth Science. Cambridge University Press, Cambridge, 41-72.
Gasse, F., in press. Diatom-inferred salinity and oxygen isotopes in Holocene waterbodies of the Western Sahara and Sahel (Africa).Implications for climate and water resource variability, Quaternary Sciences Reviews.
Gasse, F., Barker, Ph., Gell, P.A., Fritz, S.C. and Chalié, F., 1997 -Diatom-inferred salinity in palaeolakes, an indirect tracer of climate change. Quaternary Science Review, vol. 15:1-19.
Gasse, F., 1998. Water resources variability in tropical and subtropical Africa in the past. In: E. Servat et al. (Eds), Water resources variability in Africa during the Xxth Century. IAHS, 252, 97-106.
Gasse, F., 2000. Hydrological changes in the African tropics since the last glacial maximum ; Quaternary Sciences Reviews, 19, 189-211.
Gasse, F., 2001. Perspectives. Hydrological Changes in Africa. Science, 293, 2259-2260.
Verschuren, D., Laird, K.R. and Cumming, B.F., 2000. Rainfall and drought in equatorial east Africa during the past 1,100 years. Nature, 403: 410-414.