Association of «salmon epochs» in the Far East region with the large-scale climate variations in the North Pacific
2016
Krovnin, A.S. | Kotenev, B.N. | Klovach, N.V.
Based on the analysis of climatic data and data on Far East salmon catches for 1911–2016, two types of the large-scale climatic variability creating favorable conditions for growth of salmon stocks have been revealed. «The salmon epoch» in the first half of the XX century was associated with warming of surface water in the Northeast Pacific and its propagation into the north western ocean. On the contrary, the favorable conditions for growth of Asian salmon stocks since the end of the 1980s were resulted from a sharp warming of surface water in the western half of the ocean. The cooling of Northwest Pacific surface water in 2012–2014 led to decrease in salmon catches in 2012–2015. However, a sharp warming off the western North American coast began in autumn, 2013 and continued also in 2014–2016. Advection of this warm water into the Northwest Pacific resulted information of favorable conditions for survival of the 2014–2016 salmon generations, first of all in the area of West and East Kamchatka. In general, the character of sea surface temperature anomalies distribution in the northern part of the North Pacific in 2015–2016 is very similar to their distribution during the «salmon epoch» of the first half of the XX century. Thus, it may be supposed that the present period of high Far East salmon abundance has not come to its end yet. Time of its ending remain sun certain and depends on how long the anomalously warm state of surface water in the Northeast Pacific will continue. It is expected that the next «salmon epoch» will begin in the 2030s
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