Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 321633
Title Derivation of an effective height for scintillometers: La Poza Experiment in Northwest Mexico
Author(s) Hartogensis, O.K.; Watts, C.J.; Rodriguez, J.C.; Bruin, H.A.R. de
Source Journal of Hydrometeorology 4 (2003)5. - ISSN 1525-755X - p. 915 - 928.
DOI https://doi.org/10.1175/1525-7541(2003)004<0915:DOAEHF>2.0.CO;2
Department(s) Meteorology and Air Quality
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) large-aperture scintillometer - flevoland field experiment - sensible heat fluxes - refractive-index - heterogeneous surface - area - scintillation - fluctuations
Abstract The large-aperture scintillometer (LAS) is by now a generally accepted device for routinely obtaining the area-averaged sensible heat flux, H, on a scale of up to 10 km. It is an optical instrument that consists of a transmitter and receiver. In practice, the LAS beam height often varies along the path due to a variety of reasons. This study will explain what effective height to use in such situations, when analyzing scintillometer data to derive H. Several aspects are covered: a slanted path over flat terrain, structured terrain, and varying path height due to the curvature of the earth's surface. To test the derived effective height formulation the authors present LAS data taken in September and October 1996 at a rangeland site in Sonora, Mexico. In experiment 1, the LAS was set up over a slant path, ranging roughly between 10 and 45 m above the surface over a 3200-m path. In experiment 2, a horizontal LAS path was used at approximately 30 m over a pathlength of 1100 m. The resulting sensible heat fluxes were compared with eddy-covariance data and show satisfactory results for both the full and one of the approximate formulations of the effective height.
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