The rapid warming of the Arctic is a definitive sign of climate change, according to researchers.
The region has been heating up more quickly than the global average over the past four decades. The Barents Sea is warming up seven times faster than the rest of the region.
According to scientific reports and news accounts, the rate of warming in the northern part of the planet is anywhere from two to three times faster than the average.
Mika Rantanen said that he and his colleagues decided to look at the issue in the summer of 2020 because of the heat waves in the northern part of the country.
Dr. Rantanen said that they were frustrated by the fact that theArctic is warming twice as fast as the world. The data shows that it is close to four.
Australia is moving forward. The Lower House of Parliament passed a bill that commits the government to reduce carbon emissions by at least 43 percent from 2005 levels by the year 2030. Legislation will be pushed through the Senate in a few weeks.
In Britain, the heat is extreme. Without the influence of human-caused climate change, a heat wave that destroyed records in Britain in July would not have been possible.
The wind is powerful. Plans to build a wind farm off the coast of Catalonia, a part of Spain that is still highly dependent on fossil fuels, would generate urgent renewable energy. Critics say the plan would change the character of a region that has not changed much since the 20th century.
A recent study led by scientists at Los Alamos National Laboratory found similar rates of warming.
The melting of the ice sheet in the north leads to higher sea-level rise. Some of the impacts are a subject of debate among scientists, but it affects atmospheric circulation in North America and other places.
The feedback loop in which warming sea ice in the region leads to more warming, which in turn leads to even more melting and warming, is one of the reasons why the Arctic is heating so quickly. The result of this and other processes is calledArctic amplification
The time period that is analyzed and the way the region is defined are related to how the rate of warming is described.
The data from 1979 is the beginning of the analysis in the journal Communications Earth and Environment. The area north of the Arctic Circle was defined by the researchers.
Thomas Ballinger, a researcher at the University of Alaska Fairbanks, said the issue of how the region is defined is very relevant. The impact of the ice-ocean feedback on average temperatures would be reduced by a biggerArctic.
Dr. Ballinger is the author of the annual report card for the National Oceanic and Atmospheric Administration. High rates of warming in the late 1980s and 1990s were found in theFinnish study. The strongest amplification rates were in the north.
A study published last month looked at data from 1960 onward and defined a largerArctic, north of 65 degrees latitude. The rate of warming was four times the global average over the last two decades. They found that there were two decade-long periods, from the mid 1980s to the mid 1990s, and the 2000s, with big jumps in warming in the region.
Manvendra K. Dubey is a scientist at Los Alamos. They suggest that natural climate variability and warming resulted from increased emissions of greenhouse gases from human activity.
The results suggest a role for natural variability in the rate of warming, as well as some long term changes in ocean or atmospheric circulation.
He said that the interaction between the sea ice and the ocean is most important in areas where the warming rate is higher.
He said that the decline of sea ice was linked to the warming trends. The areas where the sea ice has been declining the most are where they are. The main reason is that.