ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 6, pp. 205-221

Morphometric inhomogeneities of sea ice from remote sensing and field measurements

I.A. Repina 1, 2, 3 , A.Yu. Artamonov 1 
1 A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia
2 Lomonosov Moscow State University, Moscow, Russia
3 Maykop State Technological University, Maykop, Russia
Accepted: 01.12.2022
DOI: 10.21046/2070-7401-2022-19-6-205-221
Sea ice plays an important role in the Earth’s climate system. Currently, significant changes in the extent and thickness of the sea ice sheet are occurring. Not only the volume but also the structure of the sea ice is changing. Based on field measurements and remote sensing data, the paper shows the importance of taking into account the morphometric (structural) inhomogeneities of sea ice when modeling its interaction with the atmosphere. Identification of snowfields, hummocks and leads with the help of remote sensing methods is considered. Particular attention is paid to the marginal zones. The applicability of different spectral ranges for determining the relative area of structural inhomogeneities on the ice surface is investigated. The dependence of the drag coefficient and the aerodynamic roughness parameter on the surface structure is considered. The drag coefficient depends nonlinearly on the concentration of the ice cover, the relative area of snow patches on the surface, on the width and configuration of the leads, on the spatial arrangement and height of the hummocks, and also on the stratification of the atmosphere. The parameterizations proposed in this paper can be used to calculate heat and momentum fluxes in weather and climate models, as well as to interpret remote sensing data.
Keywords: sea ice, morphometric properties, energy exchange, remote sensing, drag coefficient
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