DOI: 10.1016/j.epsl.2018.09.029
Scopus记录号: 2-s2.0-85054426734
论文题名: Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017
作者: Zhang B. ; Zhang E. ; Liu L. ; Khan S.A. ; van Dam T. ; Yao Y. ; Bevis M. ; Helm V.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503 起始页码: 216
结束页码: 226
语种: 英语
英文关键词: dynamic thickening
; geodetic measurements
; Jakobshavn Isbræ
; short-term ice mass change
Scopus关键词: Catchments
; Climate change
; Dynamics
; Geodesy
; Geodetic satellites
; Glacial geology
; Global positioning system
; Gravitation
; Runoff
; Spectrum analysis
; Geodetic measurements
; Geodetic observation
; Gravity recovery and climate experiments
; Ice-mass changes
; Seasonal variability
; Seasonal variation
; Surface mass balance
; Vertical displacements
; Ice
英文摘要: The Global Positioning System (GPS) and Gravity Recovery and Climate Experiment (GRACE) provide important geodetic datasets to study glacial mass change. Applying the multichannel singular spectral analysis to the GPS-measured vertical and horizonal crustal displacement and GRACE-derived vertical displacement near Jakobshavn Isbræ (JI) in western Greenland from 2007 to 2017, we reconstruct the short-term loading displacements due to ice mass changes. Both the vertical and east displacements show strong seasonal variability. They also reveal three episodes of transient displacements: downward and eastward motion from late 2007 to around 2010, sustained upward and westward motion from 2010 to early 2013, and downward and eastward motion till late 2016. We also forward model the seasonal and transient displacements caused by surface mass balance (SMB) and glacier dynamics. Our model agrees well with the geodetic observations and provides quantitative insights into the contribution from SMB and ice dynamics to the ice mass changes. We find that SMB is the dominant contributor to the seasonal and transient displacements at three out of four GPS sites (AASI, ILUL, and QEQE). While, at the fourth GPS site (KAGA) that is closest to the glacier, the contributions to the transient displacements from SMB and glacier dynamics are comparable. The forward modeling also suggests that the dynamic mass change in the JI catchment underwent strong seasonal variations and these variations correlated more with the seasonal retreat and advance of the calving front than with the changes of glacial velocities. Our altimetry results reveal that the frontal portion of JI catchment lost 34 Gt in 2012 and this loss of ice declined to only 11 Gt in 2016 due to widespread thickening along the main flowline. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109615
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong; School of Geodesy and Geomatics, Wuhan University, Wuhan, 430079, China; DTU Space-National Space Institute, Technical University of Denmark, Department of Geodesy, Kgs. Lyngby, Denmark; Faculty of Science, Technology, and Communication, University of Luxembourg, Luxembourg City, Luxembourg; School of Earth Sciences, Ohio State University, Columbus, OH, United States; Glaciology Section, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Zhang B.,Zhang E.,Liu L.,et al. Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017[J]. Earth and Planetary Science Letters,2018-01-01,503