Despite the fact that the deeper layers of the ocean today warms up slower than water near the surface in the future animals that live at depth, in a greater degree will suffer from the effects of climate change, reported in a new study in the journal Nature Climate Change.
Global climate change affects many animals, forcing them, as a rule, to migrate towards the poles to stay in a comfortable temperature conditions. Analysis of over 4000 species from around the world showsthat about half of them is in motion. Most terrestrial organisms each decade moved more than 15 km toward higher latitudes, while the marine species migrate four times faster. However, due to the fact that the rate of warming is highest on the surface of the planet, it is believed that deep layers of the ocean will not notice the worst effects of climate change.
Isaac Brito-Morales (Isaac Brito-Morales) from the University of Queensland together with his colleagues decided to analyze how climate change will affect different layers of the ocean. Using data from 11 models, scientists have calculated how changed over the last 50 years of climate velocity — the rate at which species must migrate to stay within their preferred temperature range and then built a forecast based on three scenarios. The first scenario assumes that greenhouse gas emissions will start falling in 2021; the second is that they will begin to decline from 2040; and the third is that emissions continue to rise until 2100.
It turned out that climate velocity in the surface layers of the ocean (depth of 0-200 meters) is almost two times higher than in the mesopelagic layer (depth of 200-1000 metres), but the highest it reaches in abyssopelagic and bathypelagic layers (depth of 1-4 km and more than 4 kilometers, respectively). The authors point out that’s responsible a large thermal uniformity of the deep-sea environment.