GPS as an independent measurement to estimate terrestrial water storage variations in Washington and Oregon
GPS as an independent measurement to estimate terrestrial water storage variations in Washington and Oregon
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DOI：
10.1002/2014jb011415
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Landerer, Felix W.
中科院分区：
文献类型：
--
作者：
Fu, Yuning;Argus, Donald F.;Landerer, Felix W.
全球定位系统（GPS）测量弹性地面负荷变形，以响应地球表面或附近的水文质量变化。我们提出了一个时间序列的陆地水存储的变化作为位置的函数在华盛顿和俄勒冈州估计使用GPS测量地球表面的垂直位移。从GPS反演的水量变化分布与地文省高度相关：季节性水量主要分布在喀斯喀特山脉和奥林匹克山脉等山区，而在哥伦比亚盆地和哈尼盆地的盆地和河谷地区则少得多。GPS被证明是区分水文模型的独立测量方法。利用GPS确定的时变月水团序列较好地恢复了喀斯喀特山脉2008-2010年的干旱期（最大值出现在2010年）和2011-2012年的恢复期。GPS推断的水存储变化的级联范围是一致的，来自喷气推进实验室的GRACE每月质量网格解决方案。当我们从GPS导出的结果中减去GRACE水系列时，RMS减少的百分比类似于62%。GPS确定的储水量变化可以填补当前GRACE使命中的空白，也可以填补从当前GRACE到未来GRACE后续任务的过渡期。我们表明，GPS推断的水存储变化可以确定和验证当地的GRACE测量的比例因子;在级联范围内，由GPS缩放的GRACE系列和基于水文模型的GRACE Tellus增益因子缩放的RMS减少高达90.5%。
The Global Positioning System (GPS) measures elastic ground loading deformation in response to hydrological mass variations on or near Earth's surface. We present a time series of change in terrestrial water storage as a function of position in Washington and Oregon estimated using GPS measurements of vertical displacement of Earth's surface. The distribution of water variation inferred from GPS is highly correlated with physiographic provinces: the seasonal water is mostly located in the mountain areas, such as the Cascade Range and Olympic Mountains, and is much smaller in the basin and valley areas of the Columbia Basin and Harney Basin. GPS is proven to be an independent measurement to distinguish between hydrological models. The drought period of 2008-2010 (maximum in 2010) and the recovery period of 2011-2012 in the Cascade Range are well recovered with GPS-determined time-variable monthly water mass series. The GPS-inferred water storage variation in the Cascade Range is consistent with that derived from JPL's GRACE monthly mass grid solutions. The percentage of RMS reduction is similar to 62% when we subtract GRACE water series from GPS-derived results. GPS-determined water storage variations can fill gaps in the current GRACE mission, also in the transition period from the current GRACE to the future GRACE Follow-on missions. We demonstrate that the GPS-inferred water storage variations can determine and verify local scaling factors for GRACE measurements; in the Cascade Range, the RMS reduction between GRACE series scaled by GPS and scaled by the hydrological model-based GRACE Tellus gain factors is up to 90.5%.