Quantifying Antarctic‐Wide Ice‐Shelf Surface Melt Volume Using Microwave and Firn Model Data: 1980 to 2021

Quantifying Antarctic‐Wide Ice‐Shelf Surface Melt Volume Using Microwave and Firn Model Data: 1980 to 2021
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使用微波和冰模型数据量化南极冰架表面融化量:1980 年至 2021 年

DOI:
10.1029/2023gl102744
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发表时间:
2023
影响因子:
5.2
通讯作者:
G. Picard
G. Picard
中科院分区:
地球科学1区
文献类型:
--
作者:
A. Banwell;N. Wever;D. Dunmire;G. Picard

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南极冰架的稳定性受到表面融化的威胁,近几十年来,多次冰架崩塌事件都与表面融化有关。在这里,我们首先使用被动和主动微波卫星观测分析了 1980 年至 2021 年融化季节南极洲冰架湿雪/冰状态的累积天数(“融化天数”)。由于这些观测结果并不能直接揭示融水量,因此我们使用基于物理的多层雪模型 SNOWPACK 进行计算,该模型由全球气候再分析模型现代时代回顾性分析研究和应用版本 2 驱动。我们发现融水天数和融水产量之间存在很强的非线性关系。 SnowPACK 对融化天数的计算显示与累积天数以及空间和年际变化的观测结果一致。半岛冰架上的融化率最高,特别是在 1992/1993 和 1994/1995 南方夏季。在所有冰架中,SNOWPACK 计算出 41 年来年融化天数和融水产量均呈小幅但显着的下降趋势。
Antarctic ice‐shelf stability is threatened by surface melt, which has been implicated in several ice‐shelf collapse events over recent decades. Here, we first analyze cumulative days of wet snow/ice status (“melt days”) for melt seasons from 1980 to 2021 over Antarctica's ice shelves using passive and active microwave satellite observations. As these observations do not directly reveal meltwater volumes, we calculate these using the physics‐based multi‐layer snow model SNOWPACK, driven by the global climate‐reanalysis model Modern‐Era Retrospective analysis for Research and Applications Version 2. We find a strong non‐linear relationship between melt days and meltwater production volume. SNOWPACK's calculation of melt days shows agreement with observations of both cumulative days, and spatial and interannual variability. Highest melt rates are found on the Peninsula ice shelves, particularly in the 1992/1993 and 1994/1995 austral summers. Over all ice shelves, SNOWPACK calculates a small, but significant, decreasing trend in both annual melt days and meltwater production volume over the 41 years.
DOI: 10.1038/s41561-020-0616-z
发表时间: 2020-09
期刊: Nature geoscience
影响因子: 18.3
作者:
Adusumilli S;Fricker HA;Medley B;Padman L;Siegfried MR
通讯作者: Siegfried MR
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DOI: 10.1029/2020gl087970
发表时间: 2020-08-16
影响因子: 5.2
作者:
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通讯作者: Keenan E
DOI: 10.5194/tc-16-5061-2022
发表时间: 2022
期刊: The Cryosphere
影响因子: --
作者:
Picard, Ghislain;Leduc-Leballeur, Marion;Banwell, Alison F.;Brucker, Ludovic;Macelloni, Giovanni
通讯作者: Macelloni, Giovanni