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Using high-resolution satellite imagery and a mathematical model, scientists have
estimated that the mean depth of lakes around the world is substantially lower
than previously thought. How many lakes are there and how deep are
they? These are fundamental questions in the study of lake water. With advances in
satellite imaging techniques, research over the last decade has narrowed in on
the first question estimating well over 100 million links on Earth. The question
of depth, however, has remained elusive. A complete understanding of these
parameters is critical to understanding the ecological and economic functions of
lakes, specifically their role in global carbon cycling.
A team of researchers working in Sweden and the USA set out to find an
accurate means to estimate the volume and depth of Earth's lakes. To accomplish
this, they developed and tested a mathematical model which incorporates
the Earth's topography and the surface area of 28 million lakes. The team then
tested their prediction method against a high confidence database of lakes in the
USA, Canada, and Sweden. The estimates, they found, corresponded quite well with the
survey data. Once verified, the researchers then used the mathematical
approach to calculate the Earth's overall lake volume and average depth.
Their estimates: a volume of nearly 200,000 cubic kilometers and a mean of
42 metres deep. These improved estimates of depth and volume represent a major
step forward in understanding the distribution of lake water on Earth. The
finding that lakes are significantly less deep on average than previously
thought has important implications for the role of these bodies of water in
global geochemical cycles.
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