A global inventory of lakes based on high-resolution satellite imagery

Abstract

An accurate description of the abundance and size distribution of lakes is critical to quantifying limnetic contributions to the global carbon cycle. However, estimates of global lake abundance are poorly constrained. We used high-resolution satellite imagery to produce a GLObal WAter BOdies database (GLOWABO), comprising all lakes greater than 0.002 km 2. GLOWABO contains geographic and morphometric information for ~117 million lakes with a combined surface area of about 5 × 10 6 km 2, which is 3.7% of the Earth's nonglaciated land area. Large and intermediate-sized lakes dominate the total lake surface area. Overall, lakes are less abundant but cover a greater total surface area relative to previous estimates based on statistical extrapolations. The GLOWABO allows for the global-scale evaluation of fundamental limnological problems, providing a foundation for improved quantification of limnetic contributions to the biogeochemical processes at large scales. Key Points Earth has 117 million lakes > 0.002 km 2 Large and intermediate lakes dominate the total surface area of lakesPower law-based extrapolations do not adequately estimate lake abundance