Fig. 7: Mean difference between comprehensive Ice Numeral (COMIN) and normalized Ice Numeral (IN) values for September (1979–2014). | Communications Earth & Environment

Fig. 7: Mean difference between comprehensive Ice Numeral (COMIN) and normalized Ice Numeral (IN) values for September (1979–2014).

From: Optimizing sea ice parameters mitigates the underestimation of Arctic marine access in CMIP6 climate models

Fig. 7

a shows results for Polar Class 6 (PC6) ships, while b shows results for Open Water (OW) ships. The blue line marks the boundary between navigable and non-navigable areas based on IN, which excludes sea ice motion. The red line represents the navigability boundary derived using COMIN, which incorporates sea ice motion. Note, that the blue line largely overlaps with the red line, i.e., the red line is hardly visible. The white region indicates areas with excessive navigational risk, deemed non-navigable. Shaded regions show the difference between COMIN and IN, with all shaded areas considered navigable. Black arrows indicate sea ice motion within the navigable region.

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