Landscape-scale heat flux measurements using scintillometry over complex terrain
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Evans, Jonathan; McNeil, Dave; Bradford, John; Eastment, Jon; Harding, Richard. 2007 Landscape-scale heat flux measurements using scintillometry over complex terrain. In: 2nd International Scintillometer Workshop, Wageningen, The Netherlands, 8 Nov 2007. Wageningen, The Netherlands.
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Text (Presentation)
EvansPresWageningenScintillometerWorkshop2007.pdf Download (3385Kb) |
Abstract/Summary
Landscape scale measurements (of the order of 2 Km2) of sensible and latent heat fluxes are required for hydrological and meteorological modeling. Evaporation is strongly dependent on land surface properties, particularly the type of vegetation cover and the aerodynamic roughness; thus aggregating field-scale measurements has much uncertainty because of the need for detailed land-cover maps and the possible disproportionate contribution of hedgerows and other patches of mixed vegetation; in any case, such a collection of field-scale instruments is a highly resource intensive approach. A potentially better alternative is reported here: long-path (large aperture) scintillometry has been used over topographically complex chalk downland with mixed vegetation, to measure sensible heat fluxes at the landscape scale. In combination with a new 94 GHz scintillometer the latent heat flux has been calculated using the two wavelength method. Comparison is made with in-field eddy correlation measurements, and the success of applying this method is discussed.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Programmes: | CEH Programmes pre-2009 publications > Water > WA02 Quantifying processes that link water quality and quantity, biota and physical environment > WA02.1 Hydrological processes |
| CEH Sections: | Harding (to 31.07.11) |
| Additional Keywords: | scintillometry, scintillometer, latent heat flux, sensible heat flux, evaporation, large aperture scintillometer, millimeter-wave scintillometer, two wavelength method, complex terrain |
| NORA Subject Terms: | Meteorology and Climatology Agriculture and Soil Science Hydrology Atmospheric Sciences |
| Date made live: | 18 Jun 2008 14:26 |
| URI: | http://nora.nerc.ac.uk/id/eprint/3015 |
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