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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 175-184

Satellite observations of the river runoff distribution in the Laptev Sea

D.I. Glukhovets 1, 2 , V.A. Artemiev 1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Moscow Institute of Physics and Technology (State University), Dolgoprudny, Russia
Accepted: 12.12.2016
DOI: 10.21046/2070-7401-2017-14-1-175-184
The paper is devoted to the study of distribution features of the Laptev Sea surface layer bio-optical properties caused by the Lena River runoff. Relatively little information is available about this region because of the difficulties of contact data obtaining. The study is based on the results of shipboard measurements which were carried out during the 63-rd cruise of R/V “Akademik Mstislav Keldysh” (August–October 2015). The results of continuous flow-through measurements of the surface layer properties are compared with coincident MODIS-Aqua ocean color images. A strong anticorrelation of direct salinity measurements in the surface layer and absorption coefficient for dissolved organic matter calculated from satellite data is detected. This relationship makes possible to define the borders of the region affected by river runoff from the satellite. Surface layer stratification leads to a reduction of the relation between shipboard and satellite data in high turbidity waters near the Lena delta (values of the attenuation coefficient are c>3 m 1). Vertical profiles of the attenuation coefficient were obtained with transmissometer at the stations. The mesoscale structure of the Lena delta (a lot of converging streams carrying relatively more turbid waters) is clearly visible in the Landsat-8 image. The intersection of these streams registered with the flow-through system is represented by simultaneous changes in the values of temperature, salinity and fluorescence intensities at a typical scale of several kilometers. The front positions according to satellite data correspond well with the results of shipboard measurements. The transition to river waters comes more gradually compared to the one observed in the Kara Sea previously.
Keywords: satellite data, Laptev Sea, river runoff, shipboard measurements, dissolved organic matter
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