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An Overview of the Regional Experiments for Land-Atmosphere Exchanges 2012 (Reflex 2012) Campaign

Timmermans W. J., Tol Ch. van der, Timmermans J., Ucer M., Chen X., Alonso L., Moreno J., Carrara A., Lopez R., Cruz Tercero F. de la, Corcoles H. L., Miguel E. de, Sanchez J. A. G., Pérez I., Franch B., Munoz J.-C. J., Skokovic D., Sobrino J., Soria G., MacArthur A., Vescovo L., Reusen I., Andreu A., Burkart A., Cilia Ch., Contreras S., Corbari Ch., Calleja J. F., Guzinski R., Hellmann Ch., Herrmann I., Kerr G., Lazar A.-L., Leutner B., Mendiguren G., Nasilowska S., Nieto H., Pachego-Labrador J., Pulanekar S., Raj R., Schikling A., Siegmann B., Bueren S. von, Su Z.

Acta Geophysica

2015

Vol. 63, no. 6

1465--1484

The REFLEX 2012 campaign was initiated as part of a training course on the organization of an airborne campaign to support advancement of the understanding of land-atmosphere interaction processes. This article describes the campaign, its objectives and observations, remote as well as in situ. The observations took place at the experimental Las Tiesas farm in an agricultural area in the south of Spain. During the period of ten days, measurements were made to capture the main processes controlling the local and regional land-atmosphere exchanges. Apart from multi-temporal, multi-directional and multi-spatial space-borne and airborne observations, measurements of the local meteorology, energy fluxes, soil temperature profiles, soil moisture profiles, surface temperature, canopy structure as well as leaf-level measurements were carried out. Additional thermo-dynamical monitoring took place at selected sites.

An inconvenient “truth” about using sensible heat flux as a surface boundary condition in models under stably stratified regimes

Basu S., Van De Wiel B., Moene A., Steeneveld G.

Acta Geophysica

2008

Vol. 56, no. 1

88-99

In single column and large-eddy simulation studies of the atmospheric bound-ary layer, surface sensible heat flux is often used as a boundary condition. In this paper, we delineate the fundamental shortcomings of such a boundary condition in the context of stable boundary layer modelling and simulation. Using an analytical approach, we are able to show that for reliable model results of the stable boundary layer accurate surface temperature prescription or prediction is needed. As such, the use of surface heat flux as a boundary condition should be avoided in stable condi-tions.