Assessment of simulations of a polar low with the Canadian Regional Climate Model

synoptic-scale lows is a common favourable environment for PL development in the Nordic Seas [47]. The PL developed early on 25 March near the sea ice edge east of Greenland, in a region with a strong temperature gradient (Fig 2B). The cloud streets and open cells associated with the MCAO are visible on IR satellite images from the AVHRR channel 4 (Fig 3). The PL Fig 2. ERA5 atmospheric fields showing the development of the PL on 25 March 2019 at (a) 0000 UTC, (b) 0600 UTC, (c) 1200 UTC, and (d) 1800 UTC. The blue isolines represent the SLP (contours every 2 hPa), the colourmap represents the 2-m temperature (˚C), and the arrows represent the 10-m wind direction and speed, with longer arrows representing higher wind speeds. The orange dashed line represents the sea ice edge, which is defined as the 0.15 contour of the SIC corresponding to 25 March 2019 at 1200 UTC. The black outlining represents the coastline. ERA5 fields have been interpolated to the grid of the simulation using bicubic interpolation for the SLP and temperature and bilinear interpolation for the wind. The dataset used to plot the geographic contours has been obtained from the GSHHG [33] under a CC BY license, with permission from Dr. Paul Wessel. https://doi.org/10.1371/journal.pone.0292250.g002 PLOS ONE Assessment of simulations of a polar low with the canadian regional climate model PLOS ONE | https://doi.org/10.1371/journal.pone.0292250 October 5, 2023 7 / 28