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首页> 外文学位 >In situ temperature monitoring of the McMurdo Ice Shelf and ice shelf cavity by fiber-optic distributed temperature sensing.
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In situ temperature monitoring of the McMurdo Ice Shelf and ice shelf cavity by fiber-optic distributed temperature sensing.

机译：通过光纤分布式温度传感对麦克默多冰架和冰架腔进行原位温度监测。

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摘要

Ice shelf basal melt rates represent an important yet challenging to measure process. Basal melt rate measurements can assist to further understand ice-ocean interactions. In November 2011, two mooring containing fiber-optic cables for distributed temperature sensing (DTS) were installed at Windless Bight, Antarctica. Temperature was measured every meter along the deployed optical fibers over the 14 month test period via Raman backscatter DTS. Over 9 million temperature measurements were recorded from two moorings during the deployment. The data was calibrated into two sets, one representing ice shelf temperature and the other representing ocean temperatures. This study examines temperature observations near the ice-ocean interface in order to understand basal melting at the location of the moorings.;Traditional methods for estimating basal melt rates rely on steady state models, however, the smooth thermal profile of ice shelves and high spatial resolution of DTS allow for small changes of the thermal gradient to be monitored over both time and space. The thermal gradient near the ice-ocean interface is extrapolated to the in situ freezing temperature in order to track the interface during the deployment. From the inferred interface locations, daily and annual melt rates are calculated to be 0.008 m·d -1 and 0.99 m·yr-1, respectively. The application of DTS systems for remote ice shelf measurements represents a new and potentially powerful tool in the study of ice shelf heat transfer.
机译：冰架的基础融化速率代表着重要但又具有挑战性的测量过程。基础融化速率测量可以帮助进一步了解冰洋相互作用。 2011年11月，在南极洲的Windless Bight安装了两根用于分布式温度感测（DTS）的包含光纤缆的缆索。在14个月的测试期间内，通过拉曼反向散射DTS在部署的光纤上每米测量温度。部署期间，从两个系泊设备上记录了超过900万个温度测量值。将数据校准为两组，一组代表冰架温度，另一组代表海洋温度。这项研究检查了冰洋界面附近的温度观测值，以了解系泊位置处的基础融化。估算基础融化速率的传统方法依赖于稳态模型，但是，冰架的光滑热剖面和高空间DTS的分辨率允许在时间和空间上监视热梯度的微小变化。将冰洋界面附近的温度梯度外推到原位冻结温度，以便在展开过程中跟踪界面。根据推断的界面位置，每天和每年的熔化速率分别计算为0.008 m·d -1和0.99 m·yr-1。 DTS系统在远程冰架测量中的应用是研究冰架传热的一种新型且潜在强大的工具。

著录项

  • 作者

    Kobs, Scott B.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Hydrology.
  • 学位 M.S.
  • 年度 2014
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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