期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 1, 页码 209-218出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL071378
关键词
limnology; topograhy; scaling; volume; mean depth
资金
- Knut and Alice Wallenberg Foundation
- National Science Foundation Graduate Research Fellowship Program [2388357]
- National Science Foundation [OCE-1315201]
Global lake volume estimates are scarce, highly variable, and poorly documented. We developed a rigorous method for estimating global lake depth and volume based on the Hurst coefficient of Earth's surface, which provides a mechanistic connection between lake area and volume. Volume-area scaling based on the Hurst coefficient is accurate and consistent when applied to lake data sets spanning diverse regions. We applied these relationships to a global lake area census to estimate global lake volume and depth. The volume of Earth's lakes is 199,000km(3) (95% confidence interval 196,000-202,000km(3)). This volume is in the range of historical estimates (166,000-280,000km(3)), but the overall mean depth of 41.8m (95% CI 41.2-42.4m) is significantly lower than previous estimates (62-151m). These results highlight and constrain the relative scarcity of lake waters in the hydrosphere and have implications for the role of lakes in global biogeochemical cycles.
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