Direct measurement of evaporation from grassland at Plynlimon

McNeil, D.D.. 1997 Direct measurement of evaporation from grassland at Plynlimon. Hydrology and Earth System Sciences, 1 (3). 447-452.

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Over the last decade there has been some uncertainty over the calculation of "actual" catchment evaporation from the long-term difference between rainfall and runoff for the grassland Wye catchment at Plynlimon, compared to estimates made using the Penman formula on data from automatic weather stations. Hence, measurements of actual evaporation were made over a two month period in the late summer of 1992 using the eddy-correlation technique on a relatively flat but wetter than average site in this upland region. Although the site was rather restricted for this type of measurement, the quality of data proved typical of other eddy-correlation measurements made at more aerodynamically suitable sites. The ratio of actual evaporation to the Penman estimate on dry days in summer was 0.83. This compares with an average annual ratio, generated from the catchment data for the period 1978 to 1995, of 1.01. The catchment rainfall value has been improved recently by weighting each gauge using altitude domains.

Item Type: Publication - Article
Programmes: CEH Programmes pre-2009 publications > Other
UKCEH and CEH Sections/Science Areas: _ Pre-2000 sections
ISSN: 1027-5606
Additional Keywords: Evaporation, Grasslands
NORA Subject Terms: Agriculture and Soil Science
Atmospheric Sciences
Date made live: 01 Jun 2009 08:28 +0 (UTC)

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