Dominant spatiotemporal structures in total water storage anomalies

IF 4.2 2区环境科学与生态学 Q1 WATER RESOURCES

Advances in Water Resources Pub Date : 2025-05-28 DOI:10.1016/j.advwatres.2025.105015

G. Libero, V. Ciriello

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Abstract

This study employs Dynamic Mode Decomposition (DMD) to derive a global-scale linear model for the temporal evolution of Total Water Storage Anomaly (TWSA) measured by GRACE satellite missions, with the goal of extracting and analyzing the dominant spatiotemporal structures governing TWSA variability. Our analysis differentiates modes associated with a periodic dynamic – linked to precipitation-driven seasonal cycles and multi-year variations – from those incorporating trend effects indicating, on average, a progressive TWSA decline. Focusing on the latter, we examine patterns associated with extreme TWSA values and their intensification over time. In regions experiencing significant TWSA changes over the past decade, DMD effectively distinguishes natural variability from trends, aligning with previous findings that identify climate change and human impact effects in the same regions. This study underscores DMD’s potential in capturing essential hydrological dynamics in data, thus supporting the interpretation of these dynamics at the scale of the analysis.

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总蓄水量异常的优势时空结构

本文采用动态模态分解（DMD）方法，建立了GRACE卫星观测总储水异常（TWSA）的全球尺度线性模型，提取并分析了TWSA变化的主要时空结构。我们的分析区分了与周期性动态相关的模式（与降水驱动的季节周期和多年变化有关）和那些包含趋势效应的模式，这些趋势效应表明，平均而言，TWSA逐渐下降。针对后者，我们研究了与极端TWSA值相关的模式及其随时间的增强。在过去10年经历TWSA显著变化的地区，DMD有效地区分了自然变率和趋势，与先前确定同一地区气候变化和人类影响影响的研究结果一致。这项研究强调了DMD在数据中捕捉基本水文动态方面的潜力，从而支持在分析尺度上解释这些动态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Water Resources 环境科学-水资源

CiteScore

9.40

自引率

6.40%

发文量

171

审稿时长

36 days

期刊介绍： Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes