Diurnal Course of the Main Heat Balance Components of a Marshy Meadow in the Lower Biebrza River Valley

作者：Kleniewska Malgorzata^*; Golaszewski Dariusz; Majewski Grzegorz; Szporak Wasilewska Sylwia; Rozbicka Katarzyna; Rozbicki Tomasz

来源：Polish Journal of Environmental Studies, 2015, 24(3): 945-950.

DOI：10.15244/pjoes/30932

• energy balance
• wetlands
• Biebrza River Valley
• eddy covariance method
• Bowen ratio method

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) (night-time) 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).

• 出版日期2015