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| EASAC report number 22 (EASAC 2013) examined trends in extreme weather within Europe. That report was published because from an economic perspective risks are not just through the change in the mean of climate variables such as temperature precipitation or wind or in derived variables like storm surge or water runoff but also the changes in their extremes. As a result that study looked at trends in the specific extremes of heat and cold precipitation storms winds and surges and drought. The report found evidence for overall increases in the frequency and economic costs of extreme events which emphasised the importance of society adapting its future planning to allow for these new extremes. In 2017 members of the original expert group under the auspices of the Norwegian Academy of Sciences and Letters and the Norwegian Meteorological Institute updated some of the statistics on which the original report was based. There has also been more recent evidence on some of the underlying drivers which include weakening of the Atlantic Meridional Overturning Circulation (AMOC) and other phenomena such as a weakening and meandering jet stream. This short addendum to our earlier report presents these findings which update and extend the previous analysis and confirm the conclusions in the original report. |
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