| 南极Getz F冰架表面冰流速及结构特征时空变化分析 |
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| 引用本文： | 赵晔蕾,许诗枫,许嘉慧,黄艳,彭小宝,王淑杰,刘红星,余柏蒗,吴健平.南极Getz F冰架表面冰流速及结构特征时空变化分析[J].冰川冻土,2022,44(1):106-116. |
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| 作者姓名： | 赵晔蕾 许诗枫 许嘉慧 黄艳 彭小宝 王淑杰 刘红星 余柏蒗 吴健平 |
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| 作者单位： | 1.华东师范大学 地理信息科学教育部重点实验室，上海 200241;2.华东师范大学 地理科学学院，上海 200241;3.美国宾夕法尼亚州 立大学 地理系，美国 宾夕法尼亚州 斯泰特科利奇 16802;4.美国阿拉巴马大学 地理系，美国 阿拉巴马州 塔斯卡卢萨 35487 |
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| 基金项目： | 国家自然科学基金项目（41771461;42071306;41701502）资助； |
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| 摘 要： | 冰川裂解与底部消融是南极冰架质量损失的主要部分，这两个过程与全球温度升高密切相关。Getz冰架较阿蒙森海其他冰架对温度的升高更为敏感，开展Getz冰架表面冰流速和结构特征长时间序列分析，对全球气候变化、极地冰川学的发展具有重要意义。基于Landsat系列影像，采用多尺度半自动化影像匹配算法重建了2000—2017年Getz F冰架表面冰流速，进一步通过遥感影像增强处理及人工目视解译，提取了2000年和2017年Getz F冰架表面结构特征，综合分析Getz F冰架长时间序列冰流速与表面特征。结果表明，2000—2017年间，Getz F冰架表面高冰流速区（850~950 m?a-1）逐渐向西部海岸线移动，海岸线向外延伸较大；冰架中西部下游冰裂缝数量明显增多，且冰裂隙呈现由东部上游向东部下游移动的趋势；冰流速总体呈随表面高程的增加而减少的趋势。研究表明Getz F冰架流量由Berry冰川补给较多，且冰流速受变性环极深水消融影响较大；同时，Getz F冰架前缘存在着较大不稳定性。
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| 关 键 词： | 南极 Getz冰架 冰流速 Landsat 图像匹配 |
| 收稿时间： | 2020-11-28 |
| 修稿时间： | 2021-05-08 |
Analysis of spatio-temporal variability of flow velocity and surface structure characteristics of Antarctic Getz F ice shelf |
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| ZHAO Yelei,XU Shifeng,XU Jiahui,HUANG Yan,PENG Xiaobao,WANG Shujie,LIU Hongxing,YU Bailang,WU Jianping.Analysis of spatio-temporal variability of flow velocity and surface structure characteristics of Antarctic Getz F ice shelf[J].Journal of Glaciology and Geocryology,2022,44(1):106-116. |
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| Authors: | ZHAO Yelei XU Shifeng XU Jiahui HUANG Yan PENG Xiaobao WANG Shujie LIU Hongxing YU Bailang WU Jianping |
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| Institution: | 1.Key Laboratory of Geographic Information Science，Ministry of Education，East China Normal University，Shanghai 200241，China;2.School of Geographical Sciences，East China Normal University，Shanghai 200241，China;3.Department of Geography，Pennsylvania State University，State College 16802，Pennsylvania，USA;4.Department of Geography，University of Alabama，Tuscaloosa 35487，Alabama，USA |
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| Abstract: | Iceberg calving and basal melting are the main component of mass loss of Antarctic ice shelves， which are closely related to climate warming. In particular， the Getz ice shelf is more sensitive to climate warming than the other ice shelves in the Amundsen sea sector. Long-term time series analysis of ice flow velocity and structural features over ice shelves is significant for understanding the evolving dynamics of ice shelves in the context of global climate change. Based on the Landsat series of images， this study used a multi-scale semi-automated image matching algorithm to derive the ice velocity measurements over the Getz F ice shelf from 2000 to 2017. We also extracted the structural features on the Getz F ice shelf in 2000 and 2017 via image enhancement and manual delineation. The results indicate that， the fast flow area （850~950 m?a-1） was gradually shifted to the west from 2000 to 2017， and the flow velocity generally decreased with the increase of surface elevation. The number of ice fractures in the lower and middle reaches of the ice shelf has increased significantly， and the fractures showed a trend of moving from the upper reaches to the lower reaches in the east. The flow of Getz F ice shelf is mostly fed by the Berry Glacier， the flow velocity is affected by the Modified Circumpolar Deep Water， and the front margin of the Getz F ice shelf has shown great instability. |
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| Keywords: | Antarctic Getz ice shelf ice velocity Landsat image matching |
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