The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula
The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula
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DOI：
10.5194/tc-15-909-2021
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发表时间：
2021-02-25
期刊：
影响因子：
5.2
通讯作者：
Stevens, Laura A.
中科院分区：
文献类型：
--
作者：
Banwell, Alison F.;Datta, Rajashree Tri;Stevens, Laura A.
2019/2020 年南半球夏季，乔治六世冰架 (GVIIS) 北部的表面融化持续时间和范围与之前 31 个夏季明显较低的融化相比是异常的。这一发现是基于对近乎连续的 41 年卫星微波辐射计和散射计数据的分析，这些数据对冰架表面和近地表雪中的融水很敏感。利用 Landsat 8（2013 年至 2020 年）和 Sentinel-2（2017 年至 2020 年）的光学卫星图像，2019/2020 年在 GVIIS 北部也观测到创纪录的地表融水积水量，1 月 19 日，23% 的地表面积被 0.62 km(3) 的融水积水覆盖。 2019/2020年这些特殊的融化和地表积水条件是由11月下旬以来持续异常长的时间（55至90小时）≥0摄氏度的气温驱动的，这限制了融水的重新冻结。持续的温暖期可能是由温暖的、低速的（
In the 2019/2020 austral summer, the surface melt duration and extent on the northern George VI Ice Shelf (GVIIS) was exceptional compared to the 31 previous summers of distinctly lower melt. This finding is based on analysis of near-continuous 41-year satellite microwave radiometer and scatterometer data, which are sensitive to meltwater on the ice shelf surface and in the near-surface snow. Using optical satellite imagery from Landsat 8 (2013 to 2020) and Sentinel-2 (2017 to 2020), record volumes of surface meltwater ponding were also observed on the northern GVIIS in 2019/2020, with 23% of the surface area covered by 0.62 km(3) of ponded meltwater on 19 January. These exceptional melt and surface ponding conditions in 2019/2020 were driven by sustained air temperatures >= 0 degrees C for anomalously long periods (55 to 90 h) from late November onwards, which limited meltwater refreezing. The sustained warm periods were likely driven by warm, low-speed (