Fig. 4: Trend of monthly-mean Arctic moisture.

a–d Linear trends of Arctic moisture for each month (shading over land; mm decade⁻¹) and evaporation (shading over the Arctic Ocean; mm month⁻¹ decade⁻¹). Vectors are as described in Fig. 3 but for each month. e–h Linear trends of daily Arctic moisture content in terms of their highest value in each year (mm decade⁻¹). Hatching denotes a trend significant at the 95% confidence level.