Crustal vertical deformation response to different spatial scales of GRACE and GCMs surface loading
Crustal vertical deformation response to different spatial scales of GRACE and GCMs surface loading
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地壳垂直变形对不同空间尺度GRACE和GCM表面载荷的响应
DOI：
10.1093/gji/ggv385
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Linguo Yuan
中科院分区：
文献类型：
--
作者：
Haoming Yan;Wu Chen;Linguo Yuan
利用重力恢复与气候试验（GRACE）和大气环流模式（GCMs）资料恢复的地表负荷效应可以很大程度上解释GPS高程序列观测到的地壳垂直形变（CVD）。我们首先表明，较低程度的CVD空间谱，由于地球的弹性响应，以均匀的表面负载起着更重要的作用比高程度的情况。然后，我们证明，GRACE数据与300-400公里的空间分辨率有能力检测99%的权力，全球和区域CVD在空间谱域中使用全球频率-波数谱方法。我们可以只使用GRACE或GCM的36度/阶（d/o）球谐系数（SHC），对应于500公里的空间分辨率，以获得超过90%的方差的总CVD模拟高达180 d/o SHC在98%的全球网格点。在全球范围内，由GRACE加载模拟的CVD可以解释GPS观测高度时间序列的72%的年振幅和69%的方差，这比GCM的结果更好，年振幅为64%，方差为41%。用三角帽法分析表明，无论是GPS高度序列还是GRACE载荷结果，月平均CVD的噪声水平都在3 mm左右，而GCMs结果的噪声水平仅为1.3mm。
Crustal vertical deformation (CVD) observed by continuous GPS height time-series can be explained largely by surface loading effects recovered from both Gravity Recover and Climate Experiment (GRACE) and General Circulation Models (GCMs) data. We first show that lower degree CVD spatial spectrum due to the Earth's elastic response to a uniform surface loading plays more important roles than that of high-degree case. We then demonstrate that GRACE data with 300–400 km spatial resolution have the ability to detect 99 per cent power of global and regional CVD in spatial spectrum domain using a global frequency–wavenumber spectrum method. We can just use either GRACE or GCMs 36 degree/order (d/o) spherical harmonic coefficients (SHCs) which correspond to 500 km spatial resolution to acquire more than 90 per cent variance of total CVD modeled by up to 180 d/o SHCs at 98 per cent global gridpoints. Globally, CVD modeled by GRACE loading can explain 72 per cent annual amplitude and 69 per cent variance of GPS observed height time-series, which is better than the GCMs results of 64 per cent for annual amplitude and 41 per cent for variance. Using a three cornered hat method, we also show that the noise level of monthly averaged CVD is about 3 mm for both GPS height time-series and GRACE loading result, while that of GCMs result is only 1.3 mm.
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