Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 2, pp. 100-113
Ice cover dynamics in the East Siberian and Laptev Seas at the second half of October 2014 from remote sensing data
L.M. Mitnik
1 , E.S. Khazanova
1
1 V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
In paper formation of an ice cover in the New Siberian Islands area, the East Siberian and Laptev Seas from satellite passive and active microwave sensing during the end of navigation by the Northern Sea Route (the second half of October, 2014) is considered . Change of the borders, concentration and area of ice is traced by the GCOM-W1 AMSR2 radiometer measurements. Ice concentration is analyzed according to the maps with the resolution of 3.1 x 3.1 km constructed with use of Artist Sea Ice (ASI) algorithm. Measurements of AMSR2 and MetOp-A and MetOp-B ASCAT scatterometers served for retrieval of near surface wind speed. From brightness variations of the Sentinel-1A SAR images with co- and cross polarizations, zones of grease ice formation and its transformation in pancake ice in the open sea and near the coast were determined. Imprints of Langmuir circulation in the form of alternating dark (grease ice) and light (water) strips were revealed on SAR images taken with high (40 x 80 m) resolution. Changes of characteristics of circulation down stream were estimated. The areas of intense air-sea interaction characterized by the strong wind and its organized variations caused by mesoscale convective rolls and cells formation in the boundary layer of the atmosphere were detected. Changes of an ice condition and possibility of navigation in Dmitry Laptev, Eterikan and Sannikova straits, and to the North of the Kotelny Island are discussed. Satellite estimates of ice cover and wind speed are consistent with data of polar hydrometeorological stations.
Keywords: microwave radiometry, GCOM-W1 AMSR2, Sentinel-1A SAR, Northern Sea Route, New Siberian Islands, Sannikov Strait, ice cover, sea ice concentration, grease ice, pancake ice, Langmuir circulation, surface wind
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