从大地测量观测看天山陆地蓄水的时空变异和气候响应过程

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-11-15 DOI:10.1016/j.ejrh.2024.102061

Tao Chen , Yuanjin Pan , Hao Ding , Jiashuang Jiao , Meilin He , Yixin Xiao

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引用次数: 0

摘要

研究区域天山地区研究重点在全球气候持续变暖的背景下，陆地蓄水量（TWS）的变化是一个与天山地区气候变化密切相关的复杂动态过程。然而，目前对天山地区的研究仅集中在陆地蓄水量的某一特定部分，且主要利用重力恢复与气候实验（GRACE）观测数据进行分析和讨论，而缺乏高灵敏度和高时间分辨率的全球导航卫星系统（GNSS）观测数据的反演结果及其对极端气候事件的响应分析。实际反演结果表明：（2）从不同数据集推断出的 TWS 变化在时空特征上表现出良好的一致性。从天山西部到天山东部，季节性 TWS 变化均呈减小趋势，但 GNSS 观测资料的变化幅度大于 GRACE 和全球陆地数据同化系统（GLDAS）观测资料。天山南部的年相比天山北部晚约 2 个月。此外，我们还研究了 TWS 年际变化与厄尔尼诺/南方涛动（ENSO）之间的关系。结果表明：(3) 从全球导航卫星系统观测资料推断出的年际 TWS 变化能更准确地探测到厄尔尼诺/南方涛动诱发的水文异常，并能更好地与降水和大气水汽含量的空间格网异常突变年份相对应，表明降水是天山 TWS 变化的主要驱动因素。我们的目标是强调全球导航卫星系统在估算 TWS 变化方面的巨大潜力，并帮助监测极端气候变化对水文过程的影响。

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Spatiotemporal variability of terrestrial water storage and climate response processes in the Tianshan from geodetic observations

Study region

The Tianshan region

Study focus

Against the backdrop of ongoing global climate warming, the terrestrial water storage (TWS) changes are a complex dynamic process closely linked to climate change in the Tianshan. However, current researches in the Tianshan only focus on a specific component of TWS and are mainly analysed and discussed by using the Gravity Recovery and Climate Experiment (GRACE) observations, while the inversion results from Global Navigation Satellite System (GNSS) observations with high sensitivity and temporal resolution and their response analysis to extreme climate events are lacking.

New hydrological insight for the region

The synthetic test show that (1) the GNSS stations in the Tianshan are able to recover the TWS changes in this region, and the recovery is better in the east Tianshan. The actual inversion results show that (2) the TWS changes inferred from various datasets exhibit good consistency in the spatiotemporal characteristics. Seasonal TWS changes all show a decreasing trend from western Tianshan to eastern Tianshan, but the GNSS observations show a larger magnitude than the GRACE and Global Land Data Assimilation System (GLDAS) observations. The annual phases in the southern Tianshan are about 2 months later than those in the northern Tianshan. Additionally, we also investigate the relationship between the interannual TWS changes and El Niño/Southern Oscillation (ENSO). The results show that (3) the interannual TWS changes inferred from the GNSS observations can more accurately detect hydrological anomalies induced by ENSO and better correspond to the abrupt years of spatial grid anomalies in the precipitation and atmospheric water vapor content, indicating that precipitation is a main driving factor of the TWS changes in the Tianshan. Our goal is to emphasize the significant potential of GNSS in estimating the TWS changes and to help monitor the impact of extreme climate changes on the hydrological processes.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.