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顾及GNSS测站分布特征的陆地水储量异常反演

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针对基于单一模型数据无法准确反演小尺度区域内陆地水储量异常(TWSA)的问题,提出一种顾及全球卫星导航系统(GNSS)测站分布特征的陆地水储量异常反演方法:以河北省 GNSS垂向形变序列和地壳水文负载(HYDL)形变模型数据为基础,结合地壳负载模型反演得到河北省 2011-2020 年间的陆地水储量异常模型TWSAGNSS-HYDL时空变化特征;然后利用地球重力恢复与气候实验(GRACE)卫星数据反演的陆地水储量异常反演模型TWSAGRACE进行验证.结果表明,2 组数据的周年振幅时空分布呈现较好的一致性;TWSA的周年振幅凸起点均位于河北省的东南部和西南部;利用小波分析对 2 组 TWSA 进行分析,可知 2 个序列存在约 350 d 的共振周期,并且在相位上存在很好的一致性;TWSAGNSS-HYDL和 TWSAGRACE的皮尔森相关系数和均方根误差分别为 0.67 cm和 1.8 cm.提出的方法可准确评估河北省水储量的时空特征,并为填补GRACE和GRACE-Follow On(FO)重力卫星之间的空白期提供参考.
Inversion of terrestrial water storage anomaly considering GNSS station distribution characteristics
Aiming at the problem that the terrestrial water storage anomaly(TWSA)within a small-scale region cannot be accurately derived based on a single dataset,the paper proposed an inversion method of terrestrial water storage anomaly considering GNSS station distribution characteristics:the spatiotemporal characteristics of terrestrial water storage anomaly model TWSAGNSS-HYDL in Hebei Province from 2011 to 2020 were obtained by integrating the Heibei provincial global navigation satellite system(GNSS)vertical displacement sequences,crustal hydrological loading(HYDL)model,and the inversion of crustal load model;then,the gravity recovery and climate experiment(GRACE)satellite data-derived terrestrial water storage anomaly inversion model TWSAGRACE was utilized to carry out the verification.Results showed that the spatiotemporal distribution of annual amplitudes of the two sets of data would show good consistency;specifically,the highest amplitude of TWSA would be mainly distributed in the southeastern and southwestern regions of Hebei Province;moreover,through wavelet analysis,it could be known that a resonance period of approximately 350 d would exist between TWSAGNSS-HYDL and TWSAGRACE sequences,with a good consistency in terms of phase;meanwhile,the Pearson correlation coefficient(PCC)and root mean square error(RMSE)of TWSAGNSS-HYDL and TWSAGRACE would be 0.67 cm and 1.8 cm,respectively.In general,the proposed method could help effectively evaluate the spatiotemporal characteristics of water storage in Hebei Province,and provide a reference to fill up the data gaps between GRACE and its following GRACE-Follow On(FO)missions.

global navigation satellite system(GNSS)crustal hydrological loading(HYDL)modelterrestrial water storage anomaly(TWSA)crustal loading modelgravity recovery and climate experiment(GRACE)satellite

徐志新、沈祎凡、亢培峰、吕广涵

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华北有色工程勘察院有限公司,石家庄 050000

自然资源部 金属矿山地下水灾害防治工程技术创新中心,石家庄 050000

辽宁工程技术大学 测绘与地理科学学院,辽宁 阜新 123000

全球卫星导航系统(GNSS) 地壳水文负载(HYDL)模型 陆地水储量异常(TWSA) 地壳负载模型 地球重力恢复与气候实验(GRACE)卫星

2024

10.16547/j.cnki.10-1096.20240619

导航定位学报

导航定位学报

CSTPCD北大核心
影响因子：0.72
ISSN：
年,卷(期)：2024.12(6)