Heat fluxes and surface radiation measurements from Samoylov Island, Lena Delta, Siberia, October 2007 to March 2008

• Main Authors: Langer, Moritz, Westermann, Sebastian, Muster, Sina, Piel, Konstanze, Boike, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Arctic; Calculated; DATE/TIME; Ground heat; flux; Heat; latent; sensible; HEIGHT above ground; latent heat flux; Long-wave downward radiation; longwave radiation; Long-wave upward radiation; MULT; Multiple investigations; Net radiation; Net radiometer; Kipp & Zonen; NR Lite; Radiometer; CNR 1; Samoylov_Island; Samoylov Island; Lena Delta; Siberia; sensible heat flux; Short-wave downward (GLOBAL) radiation; shortwave radiation; Short-wave upward (REFLEX) radiation; Time in days; lena delta; The Cryosphere; Tundra
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.789131; https://doi.org/10.1594/PANGAEA.789131

In this study, we present the winter time surface energy balance at a polygonal tundra site in northern Siberia based on independent measurements of the net radiation, the sensible heat flux and the ground heat flux from two winter seasons. The latent heat flux is inferred from measurements of the atmospheric turbulence characteristics and a model approach. The long-wave radiation is found to be the dominant factor in the surface energy balance. The radiative losses are balanced to about 60 % by the ground heat flux and almost 40 % by the sensible heat fluxes, whereas the contribution of the latent heat flux is small. The main controlling factors of the surface energy budget are the snow cover, the cloudiness and the soil temperature gradient. Large spatial differences in the surface energy balance are observed between tundra soils and a small pond. The ground heat flux released at a freezing pond is by a factor of two higher compared to the freezing soil, whereas large differences in net radiation between the pond and soil are only observed at the end of the winter period. Differences in the surface energy balance between the two winter seasons are found to be related to differences in snow depth and cloud cover which strongly affect the temperature evolution and the freeze-up at the investigated pond.