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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, 2019, Vol. 16, No. 1, pp. 158-170

Analysis of satellite observations of chlorophyll concentration in the Peter the Great Gulf (Japan Sea)

V.V. Navrotsky 1 , V.A. Dubina 1, 2 , E.P. Pavlova 3 , F.F. Khrapchenkov 1 
1 V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
2 Far Eastern State Technical Fisheries University, Vladivostok, Russia
3 V.I. ll'ichev Pacific Oceanological Institite FEB RAS, Vladivistok, Russia
Accepted: 10.01.2019
DOI: 10.21046/2070-7401-2019-16-1-158-170
Results of daily satellite snapshots of chlorophyll concentration (CHL) in the Peter the Great Gulf area were analyzed for the period 2008–2017. Grouping of the snapshots is performed subject to prevailing of one of the four factors affecting chlorophyll concentration: shore proximity, current, eddies, convection. Seasonal tendency, revealed in chlorophyll spatial distributions, is considered in relation to seasonal changes of role of different physical mechanisms in delivery of necessary for primary production biogens into the photic layer. In most cases the pictures are formed by simultaneous action of several factors, but by frequency and CHL magnitude, the prevailing factor in the considered area was shore proximity. To explain the observed seasonal differences in chlorophyll distributions and their interrelations with physical processes, results of experiments in the near-shore region with depths of 20–40 m were used. In the satellite data maximum values of CHL in the near-shore region are not observed in the periods of maximum runoff from land, but it is observed in the periods of strong thermocline and maximum intensity of internal waves (IW) in the near-bottom layer. IW breaking leads to sharp amplification of mixing and bottom sediments resuspension. Internal waves are generated by interaction of tides, eddies, and currents over the continental slope with changeable steepness and curvature, and they carry energy of these large-scale motions to shores. Eddies of different scales and tidal currents are, at the same time, the main mechanisms of the near-shore waters ventilation and chlorophyll and phytoplankton redistribution over the area with additional input of local horizontal turbulence of different origin. Effect of upwelling along the shelf boundary, which most frequently appears in papers as the main object in study of shelf productivity, in our conditions reveals itself only indirectly against the background of other factors in absentia of seasonal thermocline.
Keywords: satellites, chlorophyll, shelf, continental slope, near-shore region, tide, eddies, upwelling, internal waves
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