Separating annual, inter-annual and regional change in Sea Surface Temperature in the Northeastern Atlantic and Nordic Seas

Key Points:
Seasonal fluctuations in Nordic Seas and Northeastern Atlantic sea surface temperatures explains 90 % of the variability.
Both summer maxima and winter minima are warming, with summer temperatures warming twice as fast (0.4 and 0.2 °C per decade).
Other sources of variability include sea-ice melt and switches in large-scale oceanographic conditions in the Northeastern Atlantic.