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Water and energy fluxes from a woodland savanna (cerrado) in southeast Brazil

Cabral, Osvaldo M.R.; da Rocha, Humberto R.; Gash, John H.; Freitas, Helber C.; Ligo, Marcos A.V.. 2015 Water and energy fluxes from a woodland savanna (cerrado) in southeast Brazil. Journal of Hydrology: Regional Studies, 4 (B). 22-40. 10.1016/j.ejrh.2015.04.010

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Abstract/Summary

Study region: The area of woodland savanna (cerrado) is located in southeast Brazil (21°36′ to 44′ S, 47°34′ to 41′ W). Study focus: The cerrado sensu-stricto savanna evapotranspiration was observed using the eddy-covariance method over three years. New hydrological insights for the region: The first year total rainfall (R = 1664 mm) was 11% above the long-term rainfall (1498 mm) and the total evapotranspiration (ET = 1242 mm) and water equivalent of available energy (Av = 1835 mm) were approximately 4% and 2% greater, respectively, than in the second year when the rainfall total was 5% lower than the long-term average. In the third year despite the total rainfall (1259 mm) being 24% lower than the first year and 16% lower than the average, the totals of ET (1242 mm) and Av (1815 mm) were approximately the same. The small variation in the observed annual ET totals shows that in this cerrado vegetation the deep soil moisture content supports the ET in a dry year and the water available for recharging the soil profile and groundwater (∼R − ET) was dominated by the rainfall amount being significantly greater in the wet year (422 mm) than in the dry year (13 mm).

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.ejrh.2015.04.010
CEH Sections: CEH fellows
ISSN: 2214-5818
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: evapotranspiration, eddy covariance, canopy conductance, savanna, leaf area index, rainfall interception
NORA Subject Terms: Hydrology
Agriculture and Soil Science
Atmospheric Sciences
Date made live: 05 Aug 2015 15:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511447

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