Ongoing drought-induced uplift in the western United States
Ongoing drought-induced uplift in the western United States
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DOI：
10.1126/science.1260279
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发表时间：
2014-09-26
期刊：
影响因子：
56.9
通讯作者：
Cayan, Daniel R.
中科院分区：
文献类型：
--
作者：
Borsa, Adrian Antal;Agnew, Duncan Carr;Cayan, Daniel R.
自2013年以来，美国西部一直经历着严重的干旱。固体地球对伴随的地表和近地表水团损失的响应应该是大面积的隆升。我们使用连续运行的全球定位系统站点的季节性调整时间序列来测量这种隆起，我们将其反转以估计质量损失。中位抬升为5毫米（mm），在加州的山区高达15毫米。相关的质量损失模式，范围可达50厘米（cm）水当量，与观测到的降水和河流流量的减少是一致的。我们估计总损失约为2400亿吨，相当于整个地区10厘米厚的水层，或格陵兰冰盖每年的质量损失。
The western United States has been experiencing severe drought since 2013. The solid earth response to the accompanying loss of surface and near-surface water mass should be a broad region of uplift. We use seasonally adjusted time series from continuously operating global positioning system stations to measure this uplift, which we invert to estimate mass loss. The median uplift is 5 millimeters (mm), with values up to 15 mm in California's mountains. The associated pattern of mass loss, ranging up to 50 centimeters (cm) of water equivalent, is consistent with observed decreases in precipitation and streamflow. We estimate the total deficit to be similar to 240 gigatons, equivalent to a 10-cm layer of water over the entire region, or the annual mass loss from the Greenland Ice Sheet.