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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 5, pp. 217-228

The sea surface and the katabatic flow interaction in the fjords of Spitsbergen

I.A. Repina 1, 2 
1 A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia
2 M.V. Lomonosov Moscow State University, Moscow, Russia
Accepted: 04.09.2018
DOI: 10.21046/2070-7401-2018-15-5-217-228
The generation of katabatic winds in the Polar Regions is associated with a strong cooling of air on the glacial plateau slopes and its movement under gravity down the slope. These winds have a significant influence both on the climate of these regions and on the energy balance in the coastal zone. In turn, the strength of winds depends on the landscape and the synoptic situation in the region. A study of the turbulent structure of the katabatic winds was carried out in the Kongsfjorden-Kongwegen valley (Svalbard) at the boundary of the glacier and the fjord in the spring, which permits to evaluate the structure of the wind flow above the fjord. The main goal of this work is determination of the boundary conditions for the mesoscale climate models in areas with heterogeneous surface, and obtaining information for the interpretation of satellite data. Profile measurements made it possible to find the relationship between the altitude of the wind maximum and the atmospheric surface layer stability. When the level of the wind maximum increases, the stability of the flow increases, which leads to a discrepancy between the values calculated by the Monin – Obukhov similarity theory and the measured values of the turbulent fluxes. Errors decrease with the use of the temperature roughness length and the replacement of the stability parameter by the gradient Richardson number.
Keywords: katabatic winds, inhomogeneous surface, atmosphere-surface energy exchange, stability of the atmosphere, universal functions of the similarity theory
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