FEATURES OF OCEANOLOGICAL CONDITIONS ON THE SOUTHEASTERN SHELF OF SAKHALIN ISLAND ACCORDING TO SURVEYS ON STANDARD SECTIONS AND SATELLITE OBSERVATIONS

  • G. V. Shevchenko Sakhalin branch of the All-Russian Research Institute of Fisheries and Oceanography; Institute of Marine Geology and Geophysics FEB RAS
  • Zh. R. Tshay Sakhalin branch of the All-Russian Research Institute of Fisheries and Oceanography
  • V. N. Chastikov Sakhalin branch of the All-Russian Research Institute of Fisheries and Oceanography
DOI 10.29006/1564-2291.JOR-2020.48(2).4
Keywords temperature, salinity, standard section, river runoff, cold intermediate layer, satellite observations, anomaly, amplitude

Abstract

The average monthly temperature and salinity distributions are analyzed for 7 standard sections crossing the area off the southeast coast of Sakhalin Island, built for the navigation period (June-November). The most significant seasonal changes in oceanological conditions occur in the fall, when the modified Amur River water transported by the ESC fills the northern and western parts of the study area, and surface waters are deepened to a depth of 50 m. Interannual variations in thermal conditions were determined by satellite data. In the spring months of 1998–2002 positive anomalies prevailed, and negative in 2011–2018; in summer the temperature of the surface layer is more stable. The spatial distribution of the first EOF mode is identical to the distribution of water temperature in the surface layer according to ship surveys and is characterized by higher values in the northern and western shallow and southeastern deep-sea parts of the study area. In its amplitude, cyclic variations with a period of 6–7 years, expressed in modulation of the annual harmonic, are traced. In the amplitude of the second mode, the climate shift that occurred in 2010 and expressed in a change in its sign from positive to negative is of great interest.

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Published
2020-09-21
Issue
Vol 48 No 2 (2020): Journal of Oceanological Research
Section
Ocean physics and climate

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS