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Changes in September temperatures in the #Arctic by decade. The largest warming is co-located with areas of melting sea ice, such as the along the Eurasian coast.

Data from doi.org/10.24381/cds.f17050d7

Four polar stereographic maps showing Arctic near-surface air temperature anomalies for the month of September in 1985-1994, 1995-2004, 2005-2014, and 2015-2024. Most all areas are observing long-term warming, which is largest at the edges of the Arctic Ocean on the Atlantic and Pacific facing marginal seas.

ERA5 monthly averaged data on single levels from 1940 to present

ERA5 is the fifth generation ECMWF reanalysis for the global climate and weather for the past 8 decades. Data is available from 1940 onwards. ERA5 replaces the ERA-Interim reanalysis.
doi.org
#arctic
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