首页|Reconciled estimation of Antarctic ice sheet mass balance and contribution to global sea level change from 1996 to 2021

Reconciled estimation of Antarctic ice sheet mass balance and contribution to global sea level change from 1996 to 2021

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Reconciled estimation of Antarctic ice sheet mass balance and contribution to global sea level change from 1996 to 2021
The Antarctic Ice Sheet(AIS)has been losing ice mass and contributing to global sea level rise(GSLR).Given its mass that is enough to cause～58 m of GSLR,accurate estimation of mass balance trend is critical for AIS mass loss monitoring and sea level rise forecasting.Here,we present an improved approach to reconciled solutions of mass balance in AIS and its regions from multiple contributing solutions using the input-out,altimetric,and gravimetric methods.In comparison to previous methods,such as IMBIE 2018,this approach utilizes an adaptive data aggregation window to handle the heterogeneity of the contributing solutions,including the number of solutions,temporal distributions,uncertainties,and estimation techniques.We improved the regression-based method by using a two-step procedure that establishes ensembled solutions within each method(input-output,altimetry,or gravimetry)and then estimates the method-independent reconciled solutions.For the first time,16 contributing solutions from 8 Chinese institutions are used to estimate the reconciled mass balance of AIS and its regions from 1996 to 2021.Our results show that AIS has lost a total ice mass of～3213±253 Gt during the period,an equivalent of～8.9±0.7 mm of GSLR.There is a sustained mass loss acceleration since 2006,from 88.1±3.6 Gt yr-1 during 1996-2005 to 130.7±8.4 Gt yr-1 during 2006-2013 and further to 157.0±9.0 Gt yr-1during 2014-2021.The mass loss signal in the West Antarctica and Antarctic Peninsula is dominant and clearly presented in the reconciled estimation and contributing solutions,regardless of estimation methods used and fluctuation of surface mass balance.Uncertainty and challenges remain in mass balance estimation in East Antarctica.This reconciled estimation approach can be extended and applied for improved mass balance estimation in the Greenland Ice Sheet and mountain glacier regions.

Antarctic Ice SheetIce mass loss accelerationSea level riseReconciled estimation

Rongxing LI、Guojun LI、Gang HAI、Huan XIE、Yuan CHENG、Wei CHEN、Xiangbin CUI、Minghu DING、Chunchun GAO、Tong HAO、Changqing KE、Chuanjin LI、Jin LI、Yan LIU、Jiangjun RAN、Jiawen REN、Qiang SHEN、Yunzhong SHEN、Hongling SHI、Songyun WANG、Zemin WANG、Jingang ZHAN、Baojun ZHANG、Min ZHONG、Chunxia ZHOU

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Center for Spatial Information Science and Sustainable Development Applications,Tongji University,Shanghai 200092,China

College of Surveying and Geo-informatics,Tongji University,Shanghai 200092,China

Institute for the Conservation of Cultural Heritage,School of Cultural Heritage and Information Management,Shanghai University,Shanghai 200444,China

College of Resource Environment and Tourism,Hubei University of Arts and Science,Xiangyang 441053,China

Polar Research Institute of China,Shanghai 200136,China

State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China

College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China

School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China

Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

State Key Laboratory of Remote Sensing Science,Faculty of Geographical Science,Beijing Normal University Beijing 100875,China

Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China

State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

State Key Laboratory of Geodesy and Earths Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China

Center for Space Research,University of Texas at Austin,Austin TX 78759,USA

Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China

School of Geospatial Engineering and Science,Sun Yat-sen University,Zhuhai 519082,China

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Antarctic Ice Sheet Ice mass loss acceleration Sea level rise Reconciled estimation

2024

10.1007/s11430-023-1394-5

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(11)