BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation.
BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation.
复制标题
DOI：
10.1002/2017gl074954
复制
发表时间：
2017-11-16
影响因子：
5.2
通讯作者：
Zinglersen KB
中科院分区：
文献类型：
--
作者：
Morlighem M;Williams CN;Rignot E;An L;Arndt JE;Bamber JL;Catania G;Chauché N;Dowdeswell JA;Dorschel B;Fenty I;Hogan K;Howat I;Hubbard A;Jakobsson M;Jordan TM;Kjeldsen KK;Millan R;Mayer L;Mouginot J;Noël BPY;O'Cofaigh C;Palmer S;Rysgaard S;Seroussi H;Siegert MJ;Slabon P;Straneo F;van den Broeke MR;Weinrebe W;Wood M;Zinglersen KB
格陵兰的河床地形是冰流、接地线迁移、冰解动力学和冰下排水的主要控制因素。此外，峡湾水深测量调节了大西洋暖水（AW）的渗透，暖水会迅速融化并削弱格陵兰岛的海洋冰川。在这里，我们提出了一个新的格陵兰床地形汇编，通过质量守恒方法吸收海底测深和冰厚数据。新的150米水平分辨率的格陵兰床地形/深度地图在冰/海洋界面无缝转换，比以前的数据集有了重大改进，特别是在格陵兰西北部和东南部的海洋终端部分。我们的地图显示，格陵兰冰盖的总海平面潜势为7.42±0.05米，比以前的估计高7厘米。此外，它解释了最近许多出口冰川的裂冰锋响应，并揭示了AW可以通过海洋盆地进入冰川的新途径，从而突出了格陵兰岛最容易受到未来海洋强迫影响的部分。我们展示了格陵兰岛周围冰-海洋边缘的一个全面的、无缝的床状地形，与以前的映射相比，在200米以下的冰川崩解锋面增加了2到4倍，格陵兰岛的总冰积为2.99±0.02乘以106 km3，产生7.42米的潜在海平面上升，比以前的估计高7厘米
Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts and undercuts Greenland's marine‐terminating glaciers. Here we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation approach. A new 150 m horizontal resolution bed topography/bathymetric map of Greenland is constructed with seamless transitions at the ice/ocean interface, yielding major improvements over previous data sets, particularly in the marine‐terminating sectors of northwest and southeast Greenland. Our map reveals that the total sea level potential of the Greenland ice sheet is 7.42 ± 0.05 m, which is 7 cm greater than previous estimates. Furthermore, it explains recent calving front response of numerous outlet glaciers and reveals new pathways by which AW can access glaciers with marine‐based basins, thereby highlighting sectors of Greenland that are most vulnerable to future oceanic forcing. We present a comprehensive, seamless bed topography across the ice‐ocean margin around Greenland Two to 4 times more glaciers have calving fronts grounded below 200 m compared to previous mappings Total ice volume of Greenland is 2.99 ± 0.02 times 106 km3, yielding a potential sea level rise of 7.42 m, 7 cm greater than previous estimates