联合水文和GRACE重力数据研究南美巴塔哥尼亚冰川均衡调整（GIA）响应*

doi:10.7523/j.ucas.2024.005

摘要/Abstract

摘要： 南美巴塔哥尼亚高原位于大型温带冰块快速变化与洋—陆板块俯冲的复杂构造地区,其现今冰川均衡调整（GIA）响应信号及地表抬升的机理有待进一步明确。基于重力恢复与气候实验卫星（GRACE）时变重力数据本文分析了2003至2016年该高原地区的质量变化特征,利用相关水文模型和遥感卫星数据完善该地区的水文模型并提取水文信息空间变化特征,从GRACE综合信号中扣除水文信号得到现今GIA响应信号,并进一步通过全球定位系统（GPS）数据分析GIA效应对地表抬升的贡献。结果表明：巴塔哥尼亚高原地区呈现出巴塔哥尼亚冰原（PIF）及周围区域质量亏损、高原南部和北部质量增加的空间分布特征;水文质量亏损则形成以PIF为中心向外辐射、负信号逐渐减弱的空间分布;GIA响应使高原整体隆升,并在PIF南部最为显著,最高达1.97 ± 0.35 cm/a,与GIA模型特征相似;在北巴塔哥尼亚冰原（NPI）和南巴塔哥尼亚冰原（SPI）GIA响应分别能够解释约69.25 %、82.70 %的地表抬升信号。

关键词: GIA, GRACE, PIF, 巴塔哥尼亚高原, 水文模型

Abstract: The Patagonia Plateau in South America is located in a complex tectonic area where the large ice sheets in the temperate zone are melting rapidly and the oceanic plate is subducting into the continental plate. The signal of glacial isostatic adjustment (GIA) and the mechanism of surface uplift in this area need to be further clarified. Based on the time-variable gravity data of gravity recovery and climate experiment (GRACE), this paper analyzes the characteristics of mass trend in the plateau from 2003 to 2016. Relevant hydrological models and remote sensing satellite data are used to improve the combined hydrological model of this region and extract the spatial variation characteristics of its hydrological information. The current GIA signals are obtained by deducting hydrologic signal from the integrated GRACE signals. The contribution of GIA effect to land surface uplift is analyzed through global positioning system (GPS) data. The results show mass loss in and around Patagonia Icefield (PIF) and mass increase in the south and north of the Patagonia Plateau. The hydrologic mass loss forms a spatial distribution with PIF as the center and the negative signal gradually weakening. The GIA response causes the plateau uplift and is most significant in the southern part of PIF, reaching a maximum of 1.97 ± 0.35 cm/a. The GIA signal is similar to the GIA model. The GIA signals can interpret about 69.25% and 82.70% of GPS vertical speed signals in Northern Patagonia Icefield (NPI) and Southern Patagonia Icefield (SPI), respectively.

Key words: GIA, GRACE, PIF, Patagonia, hydrological model

中图分类号:

P223+.3

李孟雨, 孙鹏超, 郭长升, 王长瑜, 魏东平. 联合水文和GRACE重力数据研究南美巴塔哥尼亚冰川均衡调整（GIA）响应^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2024.005.

LI Mengyu, SUN Pengchao, GUO Changsheng, WANG Changyu, WEI Dongping. Combination of hydrological and GRACE gravity data to study the response of glacial isostatic adjustment (GIA) in Patagonia, South America[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.005.

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联合水文和GRACE重力数据研究南美巴塔哥尼亚冰川均衡调整（GIA）响应^*

Combination of hydrological and GRACE gravity data to study the response of glacial isostatic adjustment (GIA) in Patagonia, South America

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