Satellite altimeter observed surface water increase across lake-rich regions of the Arctic.

As shown in Figures 1 B and 1C, during 2000–2020, the lake water storages exhibit an increasing trend of 131.90 km 3 /year, and lakes with water storage increase and decline exhibit trends of 413.69 and −218.79 km 3 /year.

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Their results indicate that the net change in SWI was negative, and 82% of permafrost regions exhibited a decreasing trend in water areas. 1 However, Olthof et al. 2 argued Webb et al.’s study and concluded that results from Webb et al. 1 that show widespread Arctic surface water declines may not be reliable due to properties of the MODIS SWI index, including its coarse spatial resolution to depict the surface water extent, its sensitivity to vegetation changes and water turbidity, and a relatively weak relationship with higher-resolution surface water cover.

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