Formation of sea ice ponds from ice-shelf runoff, adjacent to the McMurdo Ice Shelf, Antarctica

Formation of sea ice ponds from ice-shelf runoff, adjacent to the McMurdo Ice Shelf, Antarctica
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南极洲麦克默多冰架附近的冰架径流形成的海冰池

DOI:
10.1017/aog.2020.9
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发表时间:
2020
影响因子:
2.9
通讯作者:
Mayer, David P.
Mayer, David P.
中科院分区:
地球科学4区
文献类型:
--
作者:
Macdonald, Grant J.;Popović, Predrag;Mayer, David P.

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在海冰上形成的池塘会导致海冰变薄或破裂,这会促进邻近冰架的崩解。海冰池塘的研究主要集中在北极池塘形成的就地融化/积水。我们的研究记录了海冰池塘形成的另一种机制。利用2015-16年至2018-19年夏季的Landsat 8和Sentinel-2图像,我们分析了南极洲麦克默多冰架附近形成的海冰池塘的演变。我们发现,每年夏天,融水从冰架上的海冰,并形成大(高达9平方公里)的池塘。这些池塘减少了海冰的径流量,使其变薄。我们认为,径流量的增加导致了冰的弯曲,可能会通过冰架前缘促进海冰的不稳定。随着冰架表面融化的增加,我们认为冰架表面水文将对海冰稳定性产生更大的影响。
Ponds that form on sea ice can cause it to thin or break-up, which can promote calving from an adjacent ice shelf. Studies of sea ice ponds have predominantly focused on Arctic ponds formed by in situ melting/ponding. Our study documents another mechanism for the formation of sea ice ponds. Using Landsat 8 and Sentinel-2 images from the 2015–16 to 2018–19 austral summers, we analyze the evolution of sea ice ponds that form adjacent to the McMurdo Ice Shelf, Antarctica. We find that each summer, meltwater flows from the ice shelf onto the sea ice and forms large (up to 9 km2) ponds. These ponds decrease the sea ice's albedo, thinning it. We suggest the added mass of runoff causes the ice to flex, potentially promoting sea-ice instability by the ice-shelf front. As surface melting on ice shelves increases, we suggest that ice-shelf surface hydrology will have a greater effect on sea-ice stability.
南极洲麦克默多冰架上基座遗迹湖的形成
DOI: 10.1017/jog.2019.17
发表时间: 2019
影响因子: 3.4
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