Monthly temperature extremes have become much more frequent, as measurements from around the world indicate.
On average, there are now five times as many record-breaking hot months worldwide than could be expected without long-term global warming, shows a
study now published in Climatic Change.
In parts of Europe, Africa and southern Asia the number of monthly records has increased even by a factor of ten. 80 percent of observed monthly records would not
have occurred without human influence on climate, concludes the authors-team of the Potsdam Institute for Climate Impact Research (PIK) and the Complutense
University of Madrid.
"The last decade brought unprecedented heat waves; for instance in the US in 2012, in Russia in 2010, in Australia in 2009, and in Europe in 2003,"
lead-author Dim Coumou says.
"Heat extremes are causing many deaths, major forest fires, and harvest losses -- societies and ecosystems are not adapted to ever new record-breaking temperatures."
The new study relies on 131 years of monthly temperature data for more than 12,000 grid points around the world, provided by NASA.
Comprehensive analysis reveals the increase in records.
The researchers developed a robust statistical model that explains the surge in the number of records to be a consequence of the long-term global warming trend.
That surge has been particularly steep over the last 40 years, due to a steep global-warming trend over this period. Superimposed on this long-term rise, the data
show the effect of natural variability, with especially high numbers of heat records during years with El Niño events. This natural variability, however, does not
explain the overall development of record events, found the researchers.
Natural variability does not explain the overall development of record events
If global warming continues, the study projects that the number of new monthly records will be 12 times as high in 30 years as it would be without climate change.
Record-breaking hot months have become much more frequent. (Credit: PIK)
"Now this doesn't mean there will be 12 times more hot summers in Europe than today -- it actually is worse," Coumou points out. For the new records set in the
2040s will not just be hot by today's standards.
"To count as new records, they actually have to beat heat records set in the 2020s and 2030s, which will already
be hotter than anything we have experienced to date," explains Coumou. "And this is just the global average -- in some continental regions, the increase in new
records will be even greater."
"Statistics alone cannot tell us what the cause of any single heat wave is, but they show a large and systematic increase in the number of heat records due to
global warming," says Stefan Rahmstorf, a co-author of the study and co-chair of PIK's research domain Earth System Analysis.
"Today, this increase is already so
large that by far most monthly heat records are due to climate change. The science is clear that only a small fraction would have occurred naturally."
Amazing Phenomenon Of Singing Plants
Plants are very much alive. Not only do they dislike human noise but they also posses the capacity to learn and communicate.
Perhaps even more astonishing is that plants can also make music.
Have you ever heard the incredible music of the plants? Plants can
actually sing and compose music and listening to it is truly beautiful and relaxing!