Features of Forming the Water Abnormal Thermal Regimes in the Kuril-Kamchatka Region

V. V. Moroz1, ✉, T. А. Shatilina2, N. I. Rudykh1

1 V. I. Il’yichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russian Federation

2 Russian Federal Research Institute of Fisheries and Oceanography, Pacific Branch of VNIRO (TINRO), Vladivostok, Russian Federation

✉ e-mail: moroz@poi.dvo.ru

Abstract

Purpose. The study aims to identify the cause-and-effect relations and mechanisms forming the water abnormal thermal regimes in the western and eastern water areas off the Kamchatka Peninsula as well as in the northern straits of the Kuril Ridge with regard to the influence of regional atmospheric processes during the warm season over the past four decades.

Methods and Results. Data from long-term observations performed at the coastal hydrometeorological stations (Hydrometeorological Centre of Russia) and NCEP/NCAR reanalysis data for the adjacent water areas permitted to study the interannual variability of thermal conditions in the region adjacent to Kamchatka in June–September period in 1980–2022. Cluster and correlation analysis were used to assess the variability of water and atmospheric circulation temperature regimes. An increase in extreme positive monthly mean values of surface water temperature has been revealed for the past two decades. The cause-and-effect relations between the anomalous changes in atmospheric field structure, their impact on water areas and the formation of abnormal thermal conditions were demonstrate.

Conclusions. Formation of the water abnormal thermal conditions in the Kamchatka Peninsula coastal regions and in the adjacent northern Kuril Ridge region is related to the intensity variability in development of such centres of atmospheric impact as the Okhotsk and Hawaiian Highs, the changes in their positions (including the spread of the North Pacific branch of the Hawaiian maximum to the northwest) and the local influence.

Keywords

Kamchatka Peninsula, northern Kuril Straits, hydrological conditions, temperature anomalies, atmospheric circulation

Acknowledgements

The study was carried out within the framework of state assignment of POI FEB, RAS on theme No. 124022100079-4, within the framework of Comprehensive Interdepartmental Program “Ecological Safety of Kamchatka: Study and Monitoring of Hazardous Natural Phenomena and Human Impacts” (NIOKTR 122012700198-9). The authors are thankful to the software developers for the opportunity of using the data posted on the websites of Global Meteorological Network, JMA and NOAA as well as to the reviewer for his useful remarks.

Original russian text

Original Russian Text © V. V. Moroz, T. А. Shatilina, N. I. Rudykh, 2025, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 41, Iss. 4, pp. 436-452 (2025)

For citation

Moroz, V.V., Shatilina, T.А. and Rudykh, N.I., 2025. Features of Forming the Water Abnormal Thermal Regimes in the Kuril-Kamchatka Region. Physical Oceanography, 32(4), pp. 464-478.

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