• Tendency to decreasing of dissolved oxygen content occurs in the lower part of the intermediate layer of the Okhotsk Sea, whereas slight increasing of oxygen content is observed in the subsurface layer and upper part of the intermediate layer because of weakening and shallowing of slope convection in conditions of warmer winters and lower ice cover. [...] • Recent changes in the macroecosystem of the Okhotsk Sea under the climate change to warming correspond to the conception of productivity decreasing and increasing of efficiency of the ecosystem functioning. [...] On the climatic scale, the oxygen content in the intermediate layer is decreasing because of the weakening of the ventilation process in the Okhotsk Sea in conditions of winter warming, but in recent years it is almost stable (Figure R17- 26). [...] [Figure R17-31] Stock dynamics for the main taxonomic groups of zooplankton in the northern Okhotsk Sea in the spring (April-May) of 2009-2017 The zooplankton biomass in the Okhotsk Sea is rather high all throughout the year, although it is higher in spring-summer than in fall-winter. [...] Recent conditions of winter warming are generally unfavorable for spawning of the largest Okhotsk population of herring because of the absence of polynyas along the northwestern coast of the sea, but earlier melting of the sea ice may partially compensate for this negative effect, and the stock of herring is still high.
- Pages
- 31
- Published in
- Canada
