Annual ice shelf average surface melt rate (filled dots) and accumulation (open dots) for R-ERA5 (black), R-HIST (blue), R-126 (green), R-245 (yellow) and R-585 (red) (in mm w.e. per year) as a function of T 2m for cold (contemporary (1979-2021, R-ERA5) T 2m < -15 C) and dry (contemporary accumulation (A) < 500 mm w.e. per year) (a) and mild (T 2m > -15 C) and wet (A > 500 mm w.e. per year) (b) climatic conditions. The selected climatic thresholds are medians-that is, just as many ice shelves fall in the cold and dry as in the wet and mild category. The resulting fits of melt and accumulation are shown by solid lines, their upper and lower uncertainty (+-1 sigma) are shown by dashed lines, and the resulting T T +- d T T is shown in the lower right corner. The vertical dashed line represents the MOA = 0.7 intersection at T 2m = T T. See the Methods for more details.
