Department of Geography, University of Sheffield, Sheffield, S10 2TN, UK.
Department of Geoscience, University of Massachusetts, Amherst, MA, 01003, USA.
Nat Commun. 2018 Apr 17;9(1):1510. doi: 10.1038/s41467-018-03707-w.
Recently obtained geophysical data show sets of parallel erosional features on the Lomonosov Ridge in the central Arctic Basin, indicative of ice grounding in water depths up to 1280 m. These features have been interpreted as being formed by an ice shelf-either restricted to the Amerasian Basin (the "minimum model") or extending across the entire Arctic Basin. Here, we use a numerical ice sheet-shelf model to explore how such an ice shelf could form. We rule out the "minimum model" and suggest that grounding on the Lomonosov Ridge requires complete Arctic ice shelf cover; this places a minimum estimate on its volume, which would have exceeded that of the modern Greenland Ice Sheet. Buttressing provided by an Arctic ice shelf would have increased volumes of the peripheral terrestrial ice sheets. An Arctic ice shelf could have formed even in the absence of a hypothesised East Siberian Ice Sheet.
最近获得的地球物理数据显示，在北极中央盆地的罗蒙诺索夫海岭上存在一系列平行的侵蚀特征，表明在水深达 1280 米的地方有冰架搁浅。这些特征被解释为由冰架形成的，要么局限于亚美大陆架盆地（“最小模型”），要么延伸穿过整个北极盆地。在这里，我们使用数值冰盖-冰架模型来探索这种冰架是如何形成的。我们排除了“最小模型”，并提出在罗蒙诺索夫海岭上搁浅需要完全覆盖北极冰架；这对其体积提出了最低估计，其体积将超过现代格陵兰冰盖。北极冰架提供的支撑作用会增加周边陆地上冰盖的体积。即使没有假设的西伯利亚东部冰盖，北极冰架也可能形成。
