The volume and mean depth of Earth's lakes
The volume and mean depth of Earth's lakes
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DOI：
10.1002/2016gl071378
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发表时间：
2017-01-01
影响因子：
5.2
通讯作者：
Seekell, D. A.
中科院分区：
文献类型：
--
作者：
Cael, B. B.;Heathcote, A. J.;Seekell, D. A.
全球湖泊体积估计是稀缺的，高度可变的，缺乏记录。我们开发了一种严格的方法来估计全球湖泊深度和体积的基础上，地球表面的赫斯特系数，它提供了一个湖泊面积和体积之间的机械连接。体积面积缩放的基础上赫斯特系数是准确的，一致的，适用于湖泊数据集跨越不同区域。我们将这些关系应用于全球湖泊面积普查，以估计全球湖泊的体积和深度。地球湖泊的体积为199，000 km（3）（95%置信区间为196，000 -202，000 km（3））。这一体积在历史估计的范围内（166，000 -280，000 km（3）），但总体平均深度为41.8米（95% CI 41.2- 42.4米），明显低于先前的估计（62- 151米）。这些结果突出和限制了湖泊沃茨在水圈中的相对稀缺性，并对湖泊在全球地球化学循环中的作用产生了影响。
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.