This is the main result from the climate summary stated in the ACF-12 Consensus statement , for temperature and precipitation during the Summer 2023, and sea ice for September 2023.
Temperature summary for the summer 2023
For the whole Arctic, strikingly large positive surface air temperature (SAT) anomalies dominated during May – September 2023. Preliminary resulting rank for June-July-August 2023 for the land Arctic is the 3rd consecutive in summer from 1950, though large regional and subseasonal variations and changes in anomaly sign continue to occur. In general, lesser scale of anomalies as well as some negative anomalies are observed for the Arctic regions with a greater share of the sea area – the Western Nordic and Chukchi Bering.
The figure below shows June – August 2023 surface air temperature (SAT) anomalies (reference period 1991-2020). The maps are produced by the Arctic and Antarctic Research Institute using ERA-5 reanalysis.
Precipitation summary for the summer 2023
During the summer 2023 drier conditions dominated over parts of Western Nordic, Eastern Siberia, Chukchi and Western Canada regions with wetter conditions over parts of Eastern Nordic, Western Siberia, Alaska and Greenland regions. Close to normal conditions were estimated for the Central Arctic.
The figure below shows June – August 2023 precipitation anomalies (reference period 1991-2020). The maps are produced by the Arctic and Antarctic Research Institute using ERA-5 reanalysis.
Sea ice summary for September 2023
The annual sea ice minimum occurred near 17th September 2023. The value close to 4.4 million square kilometers was the 8th lowest in the satellite era since 1979. Significant negative anomalies were most prominent in the areas of Eurasian and Canadian Arctic though some residual sea ice remained in both the Northern Sea Route and the Northwest Passage until the time of freeze-up.
The figure below shows blended Arctic sea ice chart (AARI, ASIP, CIS, NIC) for 18-21 September 2023 and sea ice edge occurrences for 16-20 September (reference period 1991-2020). Top: sea ice concentration, bottom: predominant stage of development. The figure was produced by the Arctic and Antarctic Research Institute.