Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 4, pp. 9-19
Accuracy of NASA/SMAP satellite salinity in the area of the outer boundary of the Ob – Yenisei plume (river plume frontal zone) in the Kara Sea
A.A. Konik
1, 2 , A.V. Zimin
1, 2 , O.A. Atadzhanova
1, 3 , A.A. Osadchiev
1 1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Saint Petersburg State University, Saint Petersburg, Russia
3 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 04.07.2023
DOI: 10.21046/2070-7401-2023-20-4-9-19
Satellite measurements of the salinity of the sea surface layer are one of the important sources of information about hydrophysical processes in the Arctic during the ice–free period. A number of previous studies have shown that standard algorithms for restoring salinity, developed and verified for the most typical thermohaline conditions for the World Ocean, work with low accuracy in the case of small values of temperature and salinity. Such conditions, in particular, are characteristic of the plumes of Arctic rivers, which occupy significant areas during the ice-free season in the Arctic Ocean. In this work, satellite data were compared with full-scale salinity measurements carried out in the Ob-Yenisei plume distribution zone in the Kara Sea in August and October 2021. It has been established that standard satellite salinity algorithms describe the surface salinity fields with sufficiently high accuracy at salinity values above 18 PSU and temperatures above 7 °C. It is shown that using cluster analysis based on satellite measurements of salinity, it is possible to obtain reliable physical and geographical characteristics of the river plume frontal zone in the Kara Sea.
Keywords: satellite salinity, NASA/SMAP, in situ measurements, Ob – Yenisei plume, plume boundary, river plume frontal zone, Kara Sea, Arctic Ocean
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