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全文摘要次数: 235 全文下载次数: 139
引用本文:

DOI:

10.11834/jrs.20210446

收稿日期:

2020-10-09

修改日期:

2021-05-18

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2005-2016年南极冰盖物质平衡精细评估
林依静1, 程晓2, 刘岩1, 于志同3, 沈强4, 赵励耘1
1.北京师范大学全球变化与地球系统研究院;2.中山大学测绘科学与技术学院;3.中国空间技术研究院钱学森空间技术实验室;4.中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室
摘要:

在全球变暖背景下,精细评估南极冰盖物质平衡可以深入探索南极冰盖变化对海平面上升的影响。基于最新的多源遥感冰盖产品,本文改进了通量法(IOM)在触地线处冰通量的评估方法,并逐年逐流域评估了2005-2016年南极冰盖物质平衡及变化,探讨了其变化的动力学和气候学原因。本文实现了触地线处冰通量的精细评估,与国际同期结果比较此方法结果更合理;同时,对比结果显示细微的数据差异和方法差异会造成IOM法物质平衡估算结果的明显差异。2005-2016年期间,南极年冰盖物质平衡基本处于物质流失状态,年均物质损耗量为109.1±34.9 Gt yr-1,年际间波动为±84.1 Gt yr-1。南极冰盖物质损耗由西南极主导,占总物质损耗量的65.1%;东南极整体处于正平衡状态,但威尔克斯地流域存在明显的物质损耗;南极半岛地区在零平衡状态下波动;岛屿冰通量首次被单独评估,处于负物质平衡状态。冰盖物质平衡变化从整体来看是由表面物质平衡主导的,受年际变化的气候学因素影响;从小尺度范围来看,冰架变薄、冰川崩解导致的触地线处冰通量的动力学变化影响了部分物质损耗严重区域的物质平衡变化,使其在崩解事件发生的年份流失的冰物质量增加。

Assessment of Antarctic Ice Sheet mass balance from 2005 to 2016
Abstract:

Under the background of global warming, a detailed assessment of the Antarctic ice sheet mass balance can provide insight into the impact of changes in the Antarctic ice sheet on sea-level rise. Based on the latest multi-source satellite products of the 00ice sheet, we improved the input-output method (IOM) to estimate the ice discharge over the grounding line and assessed the Antarctic ice sheet mass balance and its annual changes from 2005 to 2016 basin by basin to analyze the dynamic and climatological reasons. In this paper, we improve the method to finely evaluate the ice discharge over the grounding line, which is more reasonable compared with other estimations. Furthermore, we find minor differences in data and methodology results in significant differences in the mass balance estimations using the IOM method. During the period from 2005 to 2016, the Antarctic ice sheet averaged a 109.1±34.9 Gt yr-1 mass loss and an inter-annual fluctuation of ±84.1 Gt yr-1. The mass loss of the Antarctic ice sheet was dominated by the West Antarctica, accounting for 65.1% of the total mass loss. The East Antarctica was in an accumulation but there is a significant mass loss in the Wilkes Land. The Antarctic Peninsula experienced near-zero mass balance. For the first time, the ice discharge of islands has been estimated independently and the islands were in a negative mass balance. The change of ice sheet mass balance is dominated by the surface mass balance influenced by the climatic factors of interannual variation. On a small scale, the dynamic change of ice discharge over the grounding line resulted from ice shelf thinning and glacier calving events affects the change of mass balance in some areas with severe mass loss, which increases the ice loss in the years of calving events.

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