Topographic controls on ice flow and recession for Juneau Icefield (Alaska/British Columbia)
Topographic controls on ice flow and recession for Juneau Icefield (Alaska/British Columbia)
复制标题
地形对朱诺冰原冰流和退缩的控制（阿拉斯加/不列颠哥伦比亚省）
DOI：
10.1002/esp.5383
复制
发表时间：
2022
影响因子：
3.3
通讯作者：
Davies B
中科院分区：
文献类型：
--
作者：
Davies B
在全球范围内，高山冰川和冰帽的冰量正在急剧减少。由此导致的海平面上升主要是由阿拉斯加造成的。高原冰原可能对气候变化特别敏感，因为其地形对气候变化的响应具有非线性控制作用。然而，阿拉斯加高原冰原很少受到结构冰川学或区域地貌学的评估，这使得对它们现在和以前的物质平衡的控制难以确定。2019年，我们在朱诺冰原地区调查了1050个冰川和368个湖泊。自2005年清查以来，已有63座冰川消失，冰川面积减少422 km2（10.0%）。我们也提出了第一个结构冰川学和地貌学地图为整个冰原在阿拉斯加。对bbb20800个特征的冰河学测绘包括裂缝、碎屑覆盖、叶理、丘陵、中部冰碛，以及重要的冰川破碎区，其中冰川要么通过侧向退缩与支流分离（n= 59），要么在以前的冰瀑布区域内断开（n= 281）。2010年的地貌测绘包括冰碛、冰湖、冰线、笛子和漩涡。这些地貌是由小冰期（LIA）新冰期的温带冰原形成的。这些数据表明，自小冰期以来，具有类似热流和冰流状态的现代出口冰川基本上经历了持续的退缩。重要的是，冰川内部发生的断裂可以分离积累带和消融带，增加冰川质量损失的速度。我们表明，冰川断裂在冰原上很普遍，在考虑冰原对气候变化的脆弱性时，应该认真考虑冰川断裂。
Globally, mountain glaciers and ice caps are losing dramatic volumes of ice. The resultant sea‐level rise is dominated by contributions from Alaska. Plateau icefields may be especially sensitive to climate change due to the non‐linear controls their topography imparts on their response to climate change. However, Alaskan plateau icefields have been subject to little structural glaciological or regional geomorphological assessment, which makes the controls on their present and former mass balance difficult to ascertain.We inventoried 1050 glaciers and 368 lakes in the Juneau Icefield region for the year 2019. We found that 63 glaciers had disappeared since the 2005 inventory, with a reduction in glacier area of 422 km2(10.0%). We also present the first structural glaciological and geomorphological map for an entire icefield in Alaska. Glaciological mapping of >20 800 features included crevasses, debris cover, foliation, ogives, medial moraines and, importantly, areas of glacier fragmentation, where glaciers either separated from tributaries via lateral recession (n= 59), or disconnected within areas of former icefalls (n= 281). Geomorphological mapping of >10 200 landforms included glacial moraines, glacial lakes, trimlines, flutes and cirques. These landforms were generated by a temperate icefield during the Little Ice Age (LIA) neoglaciation. These data demonstrate that the present‐day outlet glaciers, which have a similar thermal and ice‐flow regime, have undergone largely continuous recession since the LIA. Importantly, disconnections occurring within glaciers can separate accumulation and ablation zones, increasing rates of glacier mass loss. We show that glacier disconnections are widespread across the icefield and should be critically taken into consideration when icefield vulnerability to climate change is considered.
登录
查看更多内容
影响因子：
5.8
作者：
M. Jacquemart;M. Loso;Matthias Leopold;Ethan Welty;Etienne Berthier;Jasmine S.S. Hansen;John Sykes;K. Tiampo
通讯作者：
M. Jacquemart;M. Loso;Matthias Leopold;Ethan Welty;Etienne Berthier;Jasmine S.S. Hansen;John Sykes;K. Tiampo
朱诺冰原质量平衡计划 1946–2011
影响因子：
11.4
作者：
M. Pelto;J. Kavanaugh;C. McNeil
通讯作者：
C. McNeil
瑞士瓦莱州巴斯冰川达罗拉的带状尖顶和相关结构的形成
影响因子：
3.4
作者：
B. Goodsell;M. Hambrey;N. Glasser
通讯作者：
N. Glasser
阿拉斯加东南部伊格尔河地区
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
Southeast Alaska
通讯作者：
Southeast Alaska
温带山谷冰川中的碎片运输：瑞士瓦莱州阿罗拉上冰川
影响因子：
3.4
作者：
B. Goodsell;M. Hambrey;N. Glasser
通讯作者：
N. Glasser