Fig. 1: Estimates of Snow Water Availability (SWA) over northern North America.
a The northern North America, compromising Canada and Alaska, and its 25 drainage regions111, mapped over the 25 × 25 km2 grid system of National Aeronautics and Space Administration’s (NASA’s) Making Earth System Data Records for Use in Research Environments (MEaSUREs) for the global landscape Freeze-Thaw Earth System Data Record (FT-ESDR165). This discretization divides the total domain into 18,060 grid cells; b Categorizations of the area-averaged 25 × 25 km2 elevation across 0–500 m, 500–1000 m, 1000–1500 m, and 1500–3000 m elevation bands. The elevation data is based on the 1 km Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010163); c Clustering the 25 drainage regions under the five major ocean-drained basins in Canada and Alaska; d Geographic extents of five SWA classes, based on annual long-term mean during 2000–2019. Five SWA classes considered include low (50 mm and below; dark blue), below-average (50–70 mm; light blue), average (70–100 mm; green), above-average (100–120 mm; pink) and high (120 mm and more; red). Each panel corresponds to one of the four estimates of SWA across Canada and Alaska. SWA1 and SWA2 have a cutoff at 64 °N due to missing MODIS data during polar nights.
