Comparison of decadal water storage trends from common GRACE releases (RL05, RL06) using spatial diagnostics and a modified triple collocation approach

IF 3.1 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Hydrology X Pub Date : 2021-12-01 DOI:10.1016/j.hydroa.2021.100108
Emad Hasan , Aondover Tarhule
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引用次数: 6

Abstract

GRACE (Gravity Recovery and Climate Experiment) and GRACE-FO (Follow-On) satellites have provided unique insights into the evolution of Terrestrial Water Storage (TWS) in space and time. Despite such advancements, various GRACE solutions produced by different data centers display uneven spatial attributes with varying associated uncertainties. Via spatial diagnostics tools and a modified triple collocation (MTC) approach, this research evaluates the TWS (terrestrial water storage) trend estimations “on the grid-scale” from 11 gridded GRACE products of RL05 and RL06 releases between 2002 and 2017. Distinct from classic TCA (triple collocation analysis), the MTC employs a GWR (geographically weighted regression) scaling scheme with distinctive spatial coefficients. The spatial diagnostics analyses identified different autocorrelation patterns, clustering tendencies of hot (positive) and cold (negative) spots agglomeration at varying spatial width, and unique frequency distributions. The results indicated that within a 10-degree spatial radius the SHs (Spherical Harmonics) of RL05 and RL06 are highly autocorrelated compared to the mascons (mass concentration blocks) solutions. The spatial clustering results revealed that many solutions agreed on the overall directions and distribution of the hot and cold spots. The clustering among mascon products, however, reflected more localized mass anomalies. At the scale of drainage basins, the trend magnitude, as well as their associated uncertainties appeared to be driven by the occurrence of spatial clusters within the basin area. The MTC results showed that the uncertainty patterns follow the same spatial extent within each cluster. The MTC analysis underscored the added benefits of cluster analysis and the GWR scaling over the classic OLS approach.

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基于空间诊断和改进三重配置方法的GRACE (RL05, RL06)年代际储水趋势比较
GRACE(重力恢复和气候实验)和GRACE- fo(后续)卫星提供了独特的见解,以了解陆地水储存(TWS)在空间和时间上的演变。尽管取得了这些进步,但不同数据中心产生的各种GRACE解决方案显示出不均匀的空间属性和不同的相关不确定性。利用空间诊断工具和改进的三重配置(MTC)方法,对2002 - 2017年11个RL05和RL06发布的格网GRACE产品进行了“网格尺度”上的TWS(陆地储水量)趋势估计。与经典的TCA(三重配置分析)不同,MTC采用具有独特空间系数的GWR(地理加权回归)标度方案。空间诊断分析发现了不同的自相关模式,热(正)点和冷(负)点在不同空间宽度上的聚类趋势,以及独特的频率分布。结果表明,在10度的空间半径范围内,RL05和RL06的球面谐波(SHs)与质量浓度块(mascons)溶液高度自相关。空间聚类结果表明,许多解决方案对热点和冷点的总体方向和分布是一致的。然而,mascon产品之间的聚类反映了更多的局部质量异常。在流域尺度上,趋势幅度及其相关的不确定性似乎受流域内空间集群的发生驱动。MTC结果表明,各聚类的不确定性模式具有相同的空间范围。MTC分析强调了与经典OLS方法相比,聚类分析和GWR缩放的额外好处。
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来源期刊
Journal of Hydrology X
Journal of Hydrology X Environmental Science-Water Science and Technology
CiteScore
7.00
自引率
2.50%
发文量
20
审稿时长
25 weeks
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