| CryoSat DEM与多种南极DEM的对比分析 |
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| 引用本文： | 岳文丽,董玉森,阿布都拉·阿不都卡地尔,崔静月,张帮政.CryoSat DEM与多种南极DEM的对比分析[J].地质科技通报,2021,40(3):219-227. |
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| 作者姓名： | 岳文丽 董玉森 阿布都拉·阿不都卡地尔 崔静月 张帮政 |
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| 基金项目： | 国家自然科学基金项目41001248国家自然科学基金项目41404027中国地质调查局项目1212011220106中国地质调查局项目12120115063201智能地学信息处理湖北省重点实验室开放研究课题KLIGIP201605 |
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| 摘 要： | 南极洲被巨厚冰雪覆盖，地质构造以南极横断山脉为界，总体分为东南极地盾和西南极活动带。数字高程模型（DEM）是研究南极冰盖变化的基础数据之一。通过多期次数字高程模型相比较获得高程的变化信息，是分析南极冰盖厚度变化和物质平衡的重要手段。然而不同类型DEM之间存的平面误差和垂直误差影响分析结果的精度。首先利用配准消除DEM间的水平误差，然后计算并按坡度提取CryoSat DEM与其他DEM的平均高程差和标准差，最后分析高程差的时空变化特征。通过分析发现，DEM之间存在不同的平面误差。其中TanDEM_X DEM与CryoSat DEM的高程平面偏差最小，而ICESat DEM与CryoSat DEM的高程平面偏差最大。在垂直方向上，0°~1°的坡度范围内，CryoSat DEM与TanDEM_X DEM的平均高程差在3.5~5.5 m之间，标准差小于18.0 m；CryoSat DEM和Bamber 1km DEM的平均高程差在-2.5~+1.0 m之间，标准差小于24.2 m；CryoSat DEM与ICESat DEM的平均高程差在-25.0~-1.0 m之间，标准差小于47.2 m；CryoSat DEM与RAMPv2 DEM的平均高程差在1.3~3.2 m之间，标准差小于45.6 m。通过研究发现南极冰盖内部高程增加，但西南极冰盖和东南极冰盖高程均在降低，且西南极降低明显，同时南极边缘地区高程降低明显。本研究为全球变化研究和南极物质平衡研究提供了重要参考。
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| 关 键 词： | 南极 地质构造 数字高程模型 水平误差 高程差 |
| 收稿时间： | 2020-06-02 |
Comparison and analysis of CryoSat DEM and the several Antarctic DEM |
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| Abstract: | Antarctica is covered by huge snow and ice, and its geological structure is bounded by the Trans-Antarctic Mountains, and is generally divided into the East Antarctic Shield and the West Antarctic Active Zone. Digital elevation model (DEM) is one of the important basic data to study the Antarctic ice sheet change. Obtaining elevation change information through the comparison of multi-period DEM is an important means to analyze the changes in the thickness and material balance of the Antarctic ice sheet. However, the horizontal and vertical errors between different types of DEM affect the accuracy of the analysis results. In this study, the horizontal error first eliminated by registration between DEMs, then elevation difference and standard deviation are calculated between CryoSat DEM and other DEMs, finally the temporal and spatial variation characteristics are evaluated. The results show that in the plane, the horizontal offset between TanDEM_X DEM and CryoSat DEM is the smallest, while that between ICESat DEM and CryoSat DEM is the largest. In the vertical direction, within the gradient range of 0° ~ 1°, the mean elevation difference between CryoSat DEM and TanDEM_X DEM is between 3.5 and 5.5 m, and the standard deviation is less than 18.0 m. The mean elevation difference between CryoSat DEM and Bamber 1km DEM is between -2.5 and +1.0 m, and the standard deviation is less than 24.2 m. The mean elevation difference between CryoSat DEM and ICESat DEM is between -25.0 and -1.0 m, and the standard deviation is less than 47.2 m. The mean elevation difference between CryoSat DEM and RAMPv2 DEM is between 1.3 and 3.2 m, and the standard deviation is less than 45.6 m. It is found that the internal elevation of Antarctic ice sheet increases, but the elevation of southwest ice sheet and southeast ice sheet decreases, and the southwest pole decreases obviously, while the elevation of Antarctic edge area decreases obviously. This study provides an important reference for global change research and Antarctic material balance research. |
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