Karlsson Nanna B, Solgaard Anne M, Mankoff Kenneth D, Gillet-Chaulet Fabien, MacGregor Joseph A, Box Jason E, Citterio Michele, Colgan William T, Larsen Signe H, Kjeldsen Kristian K, Korsgaard Niels J, Benn Douglas I, Hewitt Ian J, Fausto Robert S
Geological Survey of Denmark and Greenland, Copenhagen, Denmark.
University of Grenoble Alpes, CNRS, IGE, Grenoble, France.
Nat Commun. 2021 Jun 8;12(1):3461. doi: 10.1038/s41467-021-23739-z.
The Greenland ice sheet has been one of the largest sources of sea-level rise since the early 2000s. However, basal melt has not been included explicitly in assessments of ice-sheet mass loss so far. Here, we present the first estimate of the total and regional basal melt produced by the ice sheet and the recent change in basal melt through time. We find that the ice sheet's present basal melt production is 21.4 +4.4/-4.0 Gt per year, and that melt generated by basal friction is responsible for about half of this volume. We estimate that basal melting has increased by 2.9 ± 5.2 Gt during the first decade of the 2000s. As the Arctic warms, we anticipate that basal melt will continue to increase due to faster ice flow and more surface melting thus compounding current mass loss trends, enhancing solid ice discharge, and modifying fjord circulation.
自21世纪初以来，格陵兰冰盖一直是海平面上升的最大来源之一。然而，到目前为止，冰盖质量损失评估中尚未明确纳入底部融化情况。在此，我们首次估算了冰盖产生的总底部融化量和区域底部融化量，以及底部融化随时间的近期变化。我们发现，冰盖目前的底部融化量为每年21.4 +4.4/-4.0亿吨，其中由底部摩擦力产生的融化量约占这一总量的一半。我们估计，在21世纪的第一个十年里，底部融化量增加了2.9±5.2亿吨。随着北极变暖，我们预计底部融化将因冰流加快和更多表面融化而继续增加，从而加剧当前的质量损失趋势，增强固体冰排放，并改变峡湾环流。
Zotero 插件
