The spatio-temporal patterns of landfast ice in Antarctica during 2006-2011 and 2016-2017 using high-resolution SAR imagery
The spatio-temporal patterns of landfast ice in Antarctica during 2006-2011 and 2016-2017 using high-resolution SAR imagery
复制标题
利用高分辨率SAR影像研究2006-2011年和2016-2017年南极洲陆地冰的时空格局
DOI：
10.1016/j.rse.2020.111736
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发表时间：
2020
影响因子：
13.5
通讯作者：
Cheng Xiao
中科院分区：
文献类型：
--
作者：
Li Xinqing;Shokr Mohammed;Hui Fengming;Chi Zhaohui;Heil Petra;Chen Zhuoqi;Yu Yining;Zhai Mengxi;Cheng Xiao
陆地冰是南极海冰体系的重要组成部分。它影响南极气候和生态系统。在这项研究中，提出了 2006 年至 2011 年和 2016 年至 2017 年陆地冰边缘的第一个高分辨率、长时间序列。该数据集是基于改进的净梯度差算法使用 ENVISAT 和 Sentinel-1A/B 的 2470 个 SAR 场景以及 MODIS 图像的手动分析来生成的，以填补 SAR 数据空白。研究结果表明，各研究年份11月份的陆地冰面积约为49.49±3.25×104km2，约占南极海冰总面积的3%~4%。 2007年11月最大面积为55.70×104平方公里，最小面积为2011年44.01×104平方公里。西南极洲面积约为东南极洲面积的40%。南极洲固定冰的分布具有显着的区域差异。印度洋海域面积最大，平均值为16.49±1.1×104km2；但太平洋海域的陆地冰面积与海冰面积之比最高。已确定了二十四个陆地固定冰区，其中有成群的小型接地冰山，其中大部分位于南极洲东部，特别是沿威尔克斯地和奥茨地。提出了两个案例来说明巨大的接地冰山如何影响陆地冰。这项研究的结果非常适合支持南极气候或生态系统研究。
Landfast ice is an important component of the Antarctic sea ice regime. It affects the Antarctic climate and ecological system. In this study, the first high-resolution, long time series of the landfast ice edge from 2006 to 2011 and 2016 to 2017 is presented. The dataset was produced based on the improved net gradient difference algorithm using 2470 SAR scenes from ENVISAT and Sentinel-1A/B as well as manual analysis of MODIS imagery to fill in SAR data gaps. The study results show that the landfast ice area in November for all studied years was approximately 49.49 ± 3.25 × 104km2, accounting for about 3%–4% of the total Antarctic sea ice area. The maximum area was 55.70 × 104km2in November 2007, compared to the minimum area 44.01 × 104km2in 2011. The area in West Antarctica was about 40% of that in East Antarctica. The distribution of landfast ice in Antarctica has significant regional differences. The extent in the Indian Ocean sector is the maximum with a mean value of 16.49 ± 1.1 × 104km2; however, the ratio of the landfast ice area to the sea ice area in the Pacific Ocean sector is the highest. Twenty-four landfast ice zones with groups of small, grounded icebergs were identified, most of which were located in East Antarctica, particularly along the Wilkes Land and Oates Land. Two cases are presented to illustrate how giant, grounded icebergs affected landfast ice. Results from this study are well suited to underpin the Antarctic climate or ecological system studies.