Open AccessPeculiarity of long-term climate dynamics and its impact on the distribution and fishing of herring fish species in the Baltic Sea
Author(s) -
A. P. Pedchenko,
Vladimir D. Boitsov
Publication year - 2020
Publication title -
trudy vniro
Language(s) - English
Resource type - Journals
ISSN - 2307-3497
DOI - 10.36038/2307-3497-2020-180-44-59
Subject(s) - baltic sea , herring , sprat , oceanography , environmental science , fishing , climatology , period (music) , climate change , geography , fishery , fish <actinopterygii> , geology , biology , physics , acoustics
The features of the interannual dynamics of the surface water temperature in the Central part of the Baltic Sea and in the Gulf of Finland over the past 70 years were analyzed. The total effect of the linear trend and the long-period component on the dispersion of the initial water temperature values in the Central part of the Baltic Sea was 48.4 %, and in the Gulf of Finland was 67.0 %. These two components in 1949–2018 determined the duration of two climatic phases: moderate (1949–1987) with a heat content close to normal and warm (1988–2018). The average rate of temperature increase in the last 31-year period (1988–2018) in the Central part of the Baltic Sea was 0.42 °C per 10 years, while in the Gulf of Finland it was 1.5 times higher. The beginning of the modern period of warming of water masses coincided with the weakening of the meridional type of atmospheric circulation in the North Atlantic and the strengthening of air transport from its water area in the Eastern direction. The increase of water temperature may be one of the reasons for the redistribution of commercial concentrations of herring and sprat in the Baltic Sea, thereby the change in their annual catch in certain ICES sub-divisions of the Central part of the Baltic Sea and the Gulf of Finland was observed.