Diurnal Course of the Main Heat Balance Components of a Marshy Meadow in the Lower Biebrza River Valley
Małgorzata Kleniewska1, Dariusz Gołaszewski1, Grzegorz Majewski1 Sylwia Szporak-Wasilewska2, Katarzyna Rozbicka1, Tomasz Rozbicki1
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1Division of Meteorology and Climatology, Department of Hydraulic Engineering,
Warsaw University of Life Sciences, Nowoursynowska 166, 02-787 Warsaw, Poland
2Laboratory Water Centre, Warsaw University of Life Sciences, Poland
Submission date: 2014-06-23
Final revision date: 2014-10-07
Acceptance date: 2014-10-13
Publication date: 2015-05-20
Pol. J. Environ. Stud. 2015;24(3):945-950
Understanding the heat balance structure of the surface of a marshy meadow and the dynamics of its changes were the objectives of observations carried out in the valley of the Biebrza River. A simplified eddy covariance system allowed measurements of the density of four main energy balance components: latent (LE) and sensible (S) heat fluxes, soil heat flux (G), and net radiation (Rn).
The mean half-hourly values of the net radiation during our observations ranged from -51 W·m-2 (nighttime) to 309 W·m-2 (daytime). The amount of available energy was used for evaporation in the first place – the latent heat flux assumed the highest values in the outgoing portion of the heat balance throughout the entire data series. Mean half-hourly values of latent heat varied between -90 W·m-2 (at 3. p.m.) and 194 W·m-2 (at 1 a.m.). The values of sensible heat flux density were relatively low and ranged from -16 W·m-2 to 96 W·m-2. During the day, the soil heat flux density ranged from 2 W·m-2 to 36 W·m-2, and the flux was most often directed from the active surface into the soil profile. At night, it assumed values within the range -24 to -5 W·m-2.
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