Abstract

PAZ, Fernando  and  MARIN, Ma. Isabel. Development of a generic footprint model for static sensors of the soil-vegetation system. Terra Latinoam [online]. 2019, vol.37, n.1, pp.27-34. ISSN 2395-8030.  https://doi.org/10.28940/tl.v37i1.414.

Estimation of areas of influence (footprints) of measurements of energy and matter fluxes with eddie covariance systems allows measurements to be interoperable to analyze the problems of energy balance closures. On one hand, measurements of latent and sensible heat fluxes are dependent on the height of the sensors, wind speed and direction, morpho-structural features of the vegetation and conditions of stability of the atmosphere. On the other hand, measurements of net radiation and soil heat fluxes are not dependent on the intensity and direction of the wind or other feature. They depend only on the height of the sensor (net radiation) or the spatial configuration of the heat plates (soil heat flow). To be able to interoperate the net radiation measurements with those of the latent and sensible heat fluxes, in this work was to develop an approximate model of the footprint of static sensors, which is parameterized in a simple way depending on sensor height, vision geometry and solar illumination. The development allows the use of the footprint model in an operative way, thus allowing a perspective in relation to the problem of closures of the energy balances if it is a product of the differences in the footprints of the sensors or of wind advection. The parameterization introduced can be integrated into a flow measurement software of eddie covariance systems to perform energy balances in periods of data integration.

Keywords : energy balance closure; interoperability; net radiation; sun-sensor geometry model.

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