Late Holocene glacial activity of Bridge Glacier, British Columbia Coast Mountains
Late Holocene glacial activity of Bridge Glacier, British Columbia Coast Mountains
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不列颠哥伦比亚省海岸山脉布里奇冰川的全新世晚期冰川活动
DOI：
10.1139/e07-059
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发表时间：
2007
影响因子：
1.4
通讯作者：
Dan Smith
中科院分区：
文献类型：
--
作者：
Sandra M. Allen;Dan Smith
布里奇冰川（Bridge Glacier）是一个著名的向东流动的山谷冰川，位于太平洋山脉东侧，位于不列颠哥伦比亚省南部海岸山脉内。在过去的50年里，布里奇冰川的终点以每年125米的速度后退，目前已崩解成冰前布里奇湖。对最近冰川消退的地形和冰碛的实地调查发现了碎屑岩柱和冰川剪切树桩。对这种亚化石木材的树木冰川学分析产生了五个放射性碳控制的浮动树木年轮年表。这些样品的相对年龄和地层位置显示，桥冰川在全新世晚期至少经历了四个显著的前进时期：一个蒂德曼年龄的前进约。3000年14C BP，一个不归属的提前约。1900年14C年BP，第一个千年的进步约。公元前1500年14摄氏度，一个小冰河时代开始前进。距今700年14C。在八个终端和侧碛完成地衣调查...
Bridge Glacier is a prominent eastward-flowing valley glacier located on the east side of the Pacific Ranges within the southern British Columbia Coast Mountains. The terminus of Bridge Glacier has retreated at rates up to 125 m/year over the last 50 years and currently calves into proglacial Bridge Lake. Field investigations of the recently deglaciated terrain and moraines led to the discovery of detrital boles and glacially sheared stumps. Dendroglaciological analyses of this subfossil wood produced five radiocarbon-controlled floating tree-ring chronologies. The relative age and stratigraphic location of these samples revealed that Bridge Glacier experienced at least four periods of significant advance during the late Holocene: a Tiedemann-aged advance ca. 3000 14C years BP, an unattributed advance ca. 1900 14C years BP, a first millennium advance ca. 1500 14C years BP, and a Little Ice Age advance beginning ca. 700 14C years BP. Lichenometric investigations at eight terminal and lateral moraine comple...