Long-term and inter-annual mass changes of Patagonia Ice Field from GRACE

论文摘要

Using more than 14 years of GRACE（Gravity Recovery and Climate Experiment） satellite gravimetry observations, we estimate the ice loss rate for the Patagonia Ice Field（PIF） of South America. After correcting the effects of glacier isostatic adjustment（GIA） and hydrological variations, the ice loss rate is -23.5 ± 8.1 Giga ton per year（Gt/yr） during the period April 2002 through December 2016, equivalent to an average ice thickness change of-1.3 m/yr if evenly distributed over PIF. The PIF ice mass change series also show obvious inter-annual variations during the entire period. For the time spans April 2002 to December 2007, January 2008 to December 2012 and January 2013 to December 2016, the ice loss rates are -26.4,-9.0 and -25.0 Gt/yr, respectively, indicating that the ice melting experienced significant slowing down and accelerating again in the past decade. Comparison with time series from temperature and precipitation data over PIF suggests that the inter-annual ice losses might not be directly correlated with the temperature changes and precipitation anomalies, and thus their interrelation is intricate. However, the dramatic ice loss acceleration in 2016（with more than 100 Gt within the first half of the year） appears closely related with the evident temperature increase and severe precipitation shortage over 2016, which are likely correlated with the strong E1 Nino event around 2016. Moreover, we compare the GRACE spherical harmonic（SH） and mass concentration（Mascon） solutions in estimating the PIF ice loss rate, and find that the Mascon result has larger uncertainty in leakage error correction,while the SH solutions can better correct leakage errors based on a constrained forward modeling iterative method. Thus the GRACE SH solutions with constrained forward modeling recovery are recommended to evaluating the ice mass change of PIF or other glacier regions with relatively smaller spatial scales.

论文目录

文章来源

类型: 期刊论文

作者: Jin Li,Jianli Chen,Shengnan Ni,Lu Tang,Xiaogong Hu

来源: Geodesy and Geodynamics 2019年02期

年度: 2019

分类: 基础科学

专业: 地球物理学

单位: Shanghai Astronomical Observatory,Chinese Academy of Sciences,School of Astronomy and Space Science,University of Chinese Academy of Sciences,Center for Space Research,University of Texas at Austin,School of Communication and Information Engineering,Shanghai University

基金: supported by the Natural Science Foundation of Shanghai (17ZR1435600),the Open Fund of Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University (16-01-05),the National Key Research and Development Program of China (2016YFB0501405)

分类号: P343.6

页码: 100-109

总页数: 10

文件大小: 2099K

下载量: 23

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