Gap filling strategy for Bowen ratio energy balance method

0374237 - ÚVGZ 2012 RIV DE eng A - Abstract
Fischer, Milan - Trnka, Miroslav - Kučera, J. - Urban, J. - Balek, J. - Hlavinka, Petr - Orság, Matěj - Žalud, Zdeněk
Gap filling strategy for Bowen ratio energy balance method.
Geophysical Research Abstracts. Göttingen: Copernicus GmbH, 2011. s. 13181-13181. ISSN 1607-7962.
[European Geosciences Union General Assembly 2011. 03.04.2011-08.04.2011, Vienna]
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0073
Institutional research plan: CEZ:AV0Z60870520
Keywords : gap filling * energy balance * bowen ratio
Subject RIV: EH - Ecology, Behaviour

The inherent weakness of the Bowen ratio energy balance method, as well as other micrometeorological methods, is that it rarely provides uninterrupted data series. The reasons are usually low friction velocity, low available energy, Bowen ratio close to -1 or any system failure. The gaps subsequently result in natural impossibility to provide accurate daily, monthly or seasonal sums of evapotranspiration or other fluxes. The aim of this work is to find the most effective method for gap filling based on comparison and statistical evaluation of four semi-empirical evapo(transpi)ration model. Namely, the Priestley-Taylor, Penman and Penman-Monteith with Todorovic´s or Lohammar approach for modelling surface resistance were used. The results showed that the Penman equation adjusted by linear regression is the most accurate method, however, the Lohammar approach based on daily or weekly non-linear parameterization is the most physically-based method with high potential.
Permanent Link: http://hdl.handle.net/11104/0207201