The variability of evaporation during the HAPEX-Sahel Intensive Observation Period

The variability of evaporation during the HAPEX-Sahel Intensive Observation Period

The variation in evaporative fraction and actual evaporation is examined for three sample days in the HAPEX-Sahel Intensive Observation Period (IOP), including data from all the vegetation types and sites. The trends in evaporative fraction over the IOP are also presented for eight sites. The high r...

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Bibliographic Details
Published in:Journal of hydrology (Amsterdam) 1997-02, Vol.188 (1-4), p.385-399
Main Authors: Gash, J.H.C., Kabat, P., Monteny, B.A., Amadou, M., Bessemoulin, P., Billing, H., Blyth, E.M., deBruin, H.A.R., Elbers, J.A., Friborg, T., Harrison, G., Holwill, C.J., Lloyd, C.R., Lhomme, J.-P., Moncrieff, J.B., Puech, D., Soegaard, H., Taupin, J.D., Tuzet, A., Verhoef, A.
Format: Article
Language:eng
Subjects:
data collection
evapotranspiratie
evapotranspiration
gegevens verzamelen
hydrologie
hydrology
Life Sciences
sahel
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Summary:The variation in evaporative fraction and actual evaporation is examined for three sample days in the HAPEX-Sahel Intensive Observation Period (IOP), including data from all the vegetation types and sites. The trends in evaporative fraction over the IOP are also presented for eight sites. The high rate of evaporation from bare soil in the days following rainfall produces a variability in evaporation which makes differences between sites difficult to interpret on a day-to-day basis, but over the whole IOP it is shown that the millet uses a smaller proportion of the available energy for evaporation than the tiger bush or fallow savannah. The combined effect of differences in the total energy used and its partitioning into evaporation and sensible heat flux is demonstrated from the trends in cumulative total energy use and evaporation at the three southern sites, where it is shown that there is systematically less evaporation from the millet than from the savannah or tiger bush sites.
ISSN:0022-1694
1879-2707