Ice Thickness and Bed Elevation of the Northern and Southern Patagonian Icefields

Ice Thickness and Bed Elevation of the Northern and Southern Patagonian Icefields
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巴塔哥尼亚北部和南部冰原的冰厚和河床高程

DOI:
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发表时间:
2019
影响因子:
5.2
通讯作者:
D. Kirchner
D. Kirchner
中科院分区:
地球科学1区
文献类型:
--
作者:
R. Millan;E. Rignot;A. Rivera;V. Martineau;J. Mouginot;R. Zamora;J. Uribe;G. Lenzano;B. D. Fleurian;Xiaoxiao Li;Y. Gim;D. Kirchner

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北巴塔哥尼亚冰场和南巴塔哥尼亚冰原是南半球除南极洲以外最大的冰块,但其冰量和冰床地形鲜为人知。在这里,我们结合了2012年和2016年收集的航空重力数据,以及来自暖冰实验探测仪和Científios的EStudios中心的雷达数据,以非常详细地绘制出海床高度和冰层厚度。我们对受雷达测厚和峡湾测深约束的重力数据进行了三维反演,以推断间距为500米的海床高程,精度约为60米。我们在西方冰川Pio XI的西支、圣拉斐尔和科隆尼亚之间以及菲兹罗伊附近发现了冰厚超过1400米的深冰川山谷和低于海平面的扇区。我们计算出北巴塔哥尼亚冰原和巴塔哥尼亚南部冰原的冰量为4756±923千米3,是欧洲阿尔卑斯山冰川体积的40倍。
The Northern and Southern Patagonian Icefields are the largest ice masses in the Southern Hemisphere outside Antarctica, but their ice volume and bed topography are poorly known. Here, we combine airborne gravity data collected in 2012 and 2016, with radar data from the Warm Ice Experiment Sounder and Centro de Estudios Científicos's to map bed elevation and ice thickness in great detail. We perform a 3‐D inversion of the gravity data constrained by radar‐derived thickness and fjord bathymetry to infer bed elevation at 500‐m spacing, with a precision of about 60 m. We detect deep glacial valleys with ice thickness exceeding 1,400 m and sectors below sea level on the western branch of Glaciar Pio XI, Occidental, between San Rafael and Colonia, and near Fitz Roy. We calculate an ice volume of 4,756 ± 923 km3 for Northern Patagonia Icefield and Southern Patagonia Icefield, or 40 times the volume of glaciers in the European Alps.
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