Recent regional cooling has impacted the natural systems of the Antarctic Peninsula (AP); however, little is known concerning the changes in the high parts of the glacial systems. Dry-snow line (DSL), situated in the high parts of glaciers, is the uppermost limit of frequent or occasional surface melt. We analyse dry-snow line altitude (DSLA) changes on the AP during 2004–2020 using C-band synthetic aperture radar time series data. We demonstrate that the DSLA in the eastern part of the AP is usually higher than that of the western part. Moreover, using simulated climatic variables from regional climate models, the lowering in altitude of DSL of glaciers in most areas is identified as a response to a decrease in snowmelt and an increase in precipitation. Furthermore, correlation analyses between simulated climatic variables and the DSLA are conducted. These results present the sensitive response of variations in DSLA to meteorological conditions, and the capability of DSLA being a proxy of polar local climate in high-altitude areas with no in situ meteorological observations.

中文翻译：

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卫星衍生的干雪线作为南极半岛当地气候的指标

最近的区域降温影响了南极半岛（AP）的自然系统；然而，关于冰川系统高处的变化知之甚少。干雪线（DSL）位于冰川的高处，是频繁或偶尔地表融化的上限。我们使用 C 波段合成孔径雷达时间序列数据分析了 2004-2020 年间 AP 上的干雪线高度 (DSLA) 变化。我们证明AP东部的DSLA通常高于西部。此外，使用区域气候模型模拟的气候变量，大多数地区冰川DSL海拔的降低被认为是对融雪减少和降水增加的反应。此外，进行了模拟气候变量与DSLA之间的相关性分析。这些结果表明了 DSLA 变化对气象条件的敏感响应，以及 DSLA 作为高海拔地区极地局地气候代理的能力，没有现场气象观测。