Energy and Water Balance at Soil-Air Interface in a Sahelian Region
The aim of this work is an improvement of the parameterization of the soil moisture in the scheme of the Land Surface Process Model (LSPM) for applications over desert areas. In fact, in very dry conditions, the water vapour flux plays an important role in the evaporation processes and influences the underground profiles of humidity and temperature. The improved version of soil moisture parameterization in the LSPM scheme has been checked by using the data taken from the database of the field experiment HAPEX-Sahel (Hydrology-Atmosphere Pilot Experiment in the Sahel. 1990-1992). Model simulations refer to three different stations located in Niger (Fallow, Millet and Tiger sites) where input data for LSPM and observations were simultaneously available. The results of simulations, taking into account the water vapour flux in the soil model LSPM, seem to compare better with the observed behaviour of soil moisture and turbulent heat fluxes than those overlooking the water vapour flux, confirming the great importance of the water vapour in such dry conditions.
Key wordsDrought Heavy rain Water vapour Soil moisture Evaporation LSPM SVAT HAPEX Sahel Niger
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- Cassardo C., E. Carena, and A. Longhetto, 1998: Validation and sensitivity tests on improved parameterizations of a Land Surface Process Model (LSPM) in the Po Valley, Il Nuovo Cimento 21C n.2, 87–121.Google Scholar
- Dolman A.J., et al., 1997: The role of the land surface in Sahelian climate: HAPEX-Sahel results and future research needs. J. Hydrol., Amsterdam, 188–189, 1067–1079.Google Scholar
- Goutorbe J.P., T. Lebel, A. Tinga, P. Bessemoulin, J. Brouwer, A.J. Dolman, E.T. Engman, J.H.C. Gash, M. Hoepffner, P. Kabat, Y.H. Kerr, B. Monteny, S. Prince, F. Said, P. Sellers, and J.S. Wallace, 1993: HAPEX-Sahel a large scale study of land-atmosphere interaction in the semi-arid tropics. Ann. Geophys. 12, 53–64.CrossRefGoogle Scholar
- Kabat P., A.J. Dolman, and J.A. Elbers, 1997: Evaporation, sensible heat and surface conductance of fallow savanna and patterned woodland in the Sahel. J. Hydrol., Amsterdam, 188–189, 494–515.Google Scholar
- Loglisci N., G.P. Balsamo, C. Cassardo, and M.W. Qian, 2001: A technical description of the Land Surface Process Model (LSPM), version 2000, Internal report C.S.I. (Sala Situazione Rischi Naturali, C.so Unione Sovietica, 216–10134 Torino, Italy, firstname.lastname@example.org).Google Scholar
- Prince S.D., Y.H. Kerr, J.P. Goutorbe, T. Lebel, A. Tinga, J. Brouwer, A.J. Dolman, E.T. Engman, J.H.C. Gash, M. Hoepffner, P. Kabat, B. Molteny, F. Said, P. Sellers, and J. Wallace, 1995: Geographical Biological and Remote Sensing aspects of the Hydrologic Atmosphere Pilot Experiment in the Sahel (HAPEX-Sahel), Remote Sensing Environment. 51, 215–234.CrossRefGoogle Scholar
- Ruti P.M., C. Cassardo, C. Cacciamani, T. Paccagnella, A. Longhetto, and A. Bargagli, 1997: Inter-comparison between BATS and LSPM surface schemes, using point micrometeorological data set. Beitr. Phys. Atm., 70, 201–220.Google Scholar
- UNEP, 1992: World Atlas of Desertification. Pub. Edward Arnold, UK.Google Scholar
- Viterbo P., 1995: Initial values of soil water and the quality of the summer forecast. ECMW F Newsletter, 69, 2–8.Google Scholar