首页> 外文期刊>Marine Geology >Glacimarine sedimentation in Kangerdluk (Disko Fjord), West Greenland, in response to a surging glacier
【24h】

Glacimarine sedimentation in Kangerdluk (Disko Fjord), West Greenland, in response to a surging glacier

机译:西格陵兰Kangerdluk(Disko Fjord)的冰晶沉积,以应对汹涌的冰川

获取原文
获取原文并翻译 | 示例
           

摘要

Beginning in 1995, a large outlet glacier of the Sermersauq Ice Cap on Disko Island surged 10.5 km downvalley to within 10 km of the head of the fjord, Kuannersuit Sulluat, reaching its maximum extent in summer 1999 before beginning to retreat. Sediment discharge to the fjord increased from 13 X 10~3 t day~(-1) in 1997 to 38 X 10~3 t day~(-1) in 1999. CTD results, sediment traps and cores from the 2000 melt season document the impact of the surge on the glacimarine environment of the fjord. Within 4 km of the inflow sedimentation rates increased by 30 times over those before the surge, reaching an estimated maximum value of 29 cm a~(-1) (up to 4.2 mm day~(-1) between 24 July and 9 September 2000). Fine-grained deposits from suspension in the water column displayed diurnal laminations in response to the interaction of tidal cycles with the sediment plume; these are not found in the sediments deposited before surging. Thin beds of sandy turbidites from turbidity currents originating from slope failures on the delta front occurred at about 20 day intervals during the melt season. Each of these effects was limited to within several kilometres of the point of inflow, but provide a unique signal significantly different from those generated by normal hydroclimatically induced events.
机译:从1995年开始,迪斯科岛Sermersauq冰盖的一个大型出口冰川在距离峡湾首部Kuannersuit Sulluat不到10公里的地方冲入了10.5公里的下谷,在1999年夏季达到最大程度后才开始撤退。峡湾的沉积物排放量从1997年的13 X 10〜3 t day〜(-1)增加到1999年的38 X 10〜3 t day〜(-1)。CTD结果,2000年融化季节的沉积物陷阱和岩心激增对峡湾冰川环境的影响。在4 km的范围内,入流速率比激增前增加了30倍,估计最大值为29 cm a〜(-1)(2000年7月24日至9月9日,日流量最大为4.2 mm〜(-1))。 )。由于潮汐循环与沉积物羽流的相互作用,水柱悬浮液中的细颗粒沉积物表现出昼间的分层。这些在涌动之前沉积的沉积物中没有发现。融化季节中,由三角洲前缘的斜坡破坏引起的浊流产生的浊浊砂岩薄层大约每隔20天出现一次。这些影响中的每一个都限于流入点的几公里之内,但是提供的独特信号与正常水文气候诱发事件产生的信号明显不同。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号