Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 4, pp. 249-260
Seasonal variability of sea level pressure in the Russian Far East
D.M. Lozhkin
1 , G.V. Shevchenko
1, 2 1 Russian Federal Research Institute of Fisheries and Oceanography, Sakhalin Branch, Yuzhno-Sakhalinsk, Russia
2 Institute of Marine Geology and Geophysics FEB RAS, Yuzhno-Sakhalinsk, Russia
Accepted: 22.06.2021
DOI: 10.21046/2070-7401-2021-18-4-249-260
Based on the materials of long-term satellite observations of sea level pressure for each month, the long-term average values (norms) were calculated for the period from 1998 to 2019. Also, maps of spatial distributions of anomalies (deviations of the actual atmospheric pressure from the calculated norm) were built for each month. The most significant anomalies, both in size and scale, were observed in January 2007, 2009 and in July 2003, 2004. In January 2009, such anomalies led to a decrease in the area of ice cover in the Sea of Okhotsk. In July 2003, the invasion of the Arctic air and its long stay over the Sea of Okhotsk slowed down the heating of the surface water layer, and in July 2004, the invasion of the Pacific air led to significant positive SST anomalies. In addition to assessing the anomalies, a harmonic analysis of seasonal variations in surface atmospheric pressure was carried out. When analyzing the spatial distribution of the amplitude of the annual harmonic, a narrow region with low values was revealed, separating zones with different patterns of annual variations over the mainland (maximum in winter, minimum in summer) and the Pacific Ocean (opposite dynamics). There is a point near the eastern coast of Sakhalin, in the vicinity of which the phase of this component will change by 360° — an analogue of amphidromy in the theory of tides. At the same time, the phase changes weakly over the mainland, and very sharply along the interface between regions with a different character of the annual cycle. The amplitude of the semiannual harmonic is small over the mainland and increases over the ocean, the maximum values (4–4.5 gPa) are noted in the area bounded by coordinates 40–45° N and 162–178° E. The phase of this component increases in the direction from the mainland to the open ocean. The amplitudes of the third-year and quarter-year cyclical components are insignificant in the entire studied region.
Keywords: sea level pressure, centers of atmospheric action, seasonal harmonics, reanalysis data, amphidromy, anomalies, ice cover, sea surface temperature
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