| 基于Sentinel-1SAR数据的南极松岛冰川流速监测 |
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| 引用本文： | 赵家锐,柯长青.基于Sentinel-1SAR数据的南极松岛冰川流速监测[J].冰川冻土,2019,41(1):12-18. |
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| 作者姓名： | 赵家锐 柯长青 |
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| 作者单位： | 南京大学地理与海洋科学学院,江苏南京,210023;南京大学地理与海洋科学学院,江苏南京,210023 |
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| 基金项目： | 国家自然科学基金项目（41371391；41830105）；国家重点研发计划项目（2018YFC1407203）资助 |
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| 摘 要： | 南极入海冰川的流速对了解物质平衡和海平面上升具有重要意义。基于Sentinel-1 SAR数据，利用特征跟踪法提取了2015-2017年松岛冰川的冬夏季流速，分析了冰川流速的年际和季节变化特征。结果表明松岛冰川处于高速流动状态，流速最高达4 400 m·a-1左右。沿主流线方向，2015-2017年2月（夏季）的平均流速分别是3 502 m·a-1、3 529 m·a-1、3 498 m·a-1。2015-2017年8月（冬季）的平均流速分别是3 473 m·a-1、3 498 m·a-1、3 478 m·a-1。2015-2017年松岛冰川主流线上平均流速为3 450~3 550 m·a-1，流速总体保持稳定，没有明显变化。2015-2017年松岛冰川流速没有明显季节差异，冬夏季流速大致持平。基于裸露岩石作为控制点的分析表明误差为22~39 m·a-1，冰川流速监测结果是可信的。
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| 关 键 词： | 冰川流速 Sentinel-1 SAR 特征跟踪 松岛冰川 南极 |
| 收稿时间： | 2018-04-22 |
| 修稿时间： | 2018-10-12 |
Flow velocity of the Pine Island Glacier,West Antarctica,derived from Sentinel-1 SAR data |
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| ZHAO Jiarui,KE Changqing.Flow velocity of the Pine Island Glacier,West Antarctica,derived from Sentinel-1 SAR data[J].Journal of Glaciology and Geocryology,2019,41(1):12-18. |
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| Authors: | ZHAO Jiarui KE Changqing |
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| Institution: | School of Geography and Ocean Sciences, Nanjing University, Nanjing 210023, China |
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| Abstract: | The flow velocity of outlet glaciers in Antarctica is of great significance for understanding mass balance and sea level rise. Based on the Sentinel-1 SAR data, the flow velocity of Pine Island Glacier in West Antarctica from 2015 to 2017 was extracted by using the feature-tracking method; the annual and seasonal variations of the velocity were analyzed. The results showed that the Pine Island Glacier had flowed at a high-speed, with a maximum velocity up to 4 400 m·a-1. Along the mainstream line AB, the average velocity in February (summer) of 2015-2017 were 3 502 m·a-1, 3 529 m·a-1 and 3 498 m·a-1, respectively. The average velocity in August (winter) of 2015-2017 were 3 473 m·a-1, 3 498 m·a-1 and 3 478 m·a-1, respectively. All the average velocities were between 3 450~3 550 m·a-1, with less fluctuation from 2015 to 2017. Also there was no obvious seasonal variation of flow velocity in 2015-2017, and almost the same in summer and in winter. The error analysis based on bare rock as control point shows that the velocity error margin ranges between 22~39 m·a-1, thus the extracted glacier flow velocities is credible. |
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| Keywords: | glacier flow velocity Sentinel-1 SAR feature tracking Pine Island Glacier Antarctica |
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