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Temporal and spatial changes of the basal channel of the getz ice shelf in Antarctica derived from multi-source data

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Acta Oceanologica Sinica 2022年第9期41卷 50-59页

作者： Zemin Wang Mingliang Liu Baojun Zhang Xiangyu Song Jiachun An Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan430079China School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuang050043China Key Laboratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University) Ministry of EducationShijiazhuang050043China

Basal melting is an important factor affecting the stability of the ice *** basal channel is formed from uneven melting,which also has an important impact on the stability of the ice ***,it has important scientific value to study the basal channel *** study combined datasets of Mosaics of Antarctica,Reference Elevation Model of Antarctica(REMA) and Operation ice Bridge to study the temporal and spatial changes of basal channels at the getz ice shelf in *** relationships between the cross-sectional area and width of basal channel and those of its corresponding surface depression were statistically ***,the changes of the basal channels of getz ice shelf were derived from the iceSat observations and REMA digital elevation models(DEMs).After a detailed analysis of the factors affecting the basal channel changes,we found that the basal channels of getz ice shelf were mainly concentrated in the eastern of the ice shelf,and most of them belonged to the ocean-sourced basal *** 2009 to 2016,the total length of the basal channel has increased by approximately 60 *** by the warm Circumpolar Deep Water(CDW),significant changes in the basal channel occurred in the middle reaches of the getz ice *** change of the basal channels at the edge of the getz ice shelf is significantly weaker than that in its middle and upper *** in 2005–2012,the eastward wind on the ocean wind field and the westward wind around the continental shelf caused the invasion and upwelling of ***,the continuous warming of deep seawater also caused the deepening of the basal *** from 2012 to 2020,the fluctuations of the basal channels seem to be caused by the changes in temperature of CDW.

关键词： getz ice shelf basal channel surface elevation iceSat DEM

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