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首页> 外文学位 >Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods.
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Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods.

机译：从井壁温度测量和地球物理反演方法推断出南极东部的年代际温度趋势。

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摘要

The climate trend of the Antarctic interior remains unclear relative to the rest of the globe because of a lack of long-term weather records. Recent studies by other authors utilizing sparse available records, satellite data, and models have estimated a significant warming trend in the near-surface air temperature in West Antarctica and weak and poorly constrained warming trend in East Antarctica for the past 50 years. In this dissertation, firn thermal profiling was used to detect multi-decadal surface temperature trends in the interior of East Antarctica where few previous records of any kind exist. The surface temperature inversion from firn temperature profiles provides a climate reconstruction independent of firn chemistry, sparse weather data, satellite data, or ice cores, and therefore may be used in conjunction with these data sources for corroboration of climate trends over the large ice sheets.;During the Norwegian-U.S. IPY Scientific Traverse of East Antarctica, in the austral summers of 2007--08 and 2008--09, thermal-profiling telemetry units were installed at five locations. Each unit consists of 16 PRTs (Platinum Resistance Thermometers) distributed in a back-filled borehole of 80 to 90 m deep. The accuracy of the temperature measurement is 0.03 K.;Geophysical inverse methods (linearized and Monte Carlo inversion) were applied to one full year of data collected from three units installed near the ice divide in the Dome Fuji/Pole of Inaccessibility region and one on Recovery Lake B, situated >500 km south to south-west of and >1000 m lower in altitude than sites near the ice divide. Three sites near the ice divide indicate that the mean surface temperatures have increased approximately 1 to 1.5 K within the past ∼50 years although the onset and the duration of this warming vary by site. On the other hand, slight cooling to no change was detected at the Recovery Lake B site. Although uncertainties remain due to limitations of the method, these results raise the possibility of an interesting recent climate pattern in East Antarctica; significant warming trend near the ice divide and cooling to no change off the divide.
机译：由于缺乏长期的天气记录，相对于全球其他地区，南极内部的气候趋势仍然不清楚。其他作者最近利用稀疏的可用记录，卫星数据和模型进行的研究估计，在过去的50年中，南极西部的近地表气温出现了明显的变暖趋势，而南极东部的变暖趋势受到了弱弱约束。在本文中，采用火热轮廓分析法检测了南极东部内部几十年的地表温度趋势，那里以前几乎没有任何记录。烧成温度剖面的地表温度反演提供了与烧成化学，稀疏天气数据，卫星数据或冰芯无关的气候重建，因此可以与这些数据源结合使用，以证实大冰盖上的气候趋势。 ;在挪威-美国期间在2007--08和2008--09的南半球夏季，南极洲的IPY Scientific Traverse公司在五个地点安装了热仿形遥测仪。每个单元由16个PRT（铂电阻温度计）组成，分布在80至90 m深的回填钻孔中。温度测量的精度为0.03 K .;地球物理反演方法（线性化和蒙特卡罗反演）应用于一整年的数据收集，该数据是从安装在靠近富士穹顶/难以接近的极地冰隔处的三个单元收集的，其中一个恢复湖B，位于西南向西南> 500公里，海拔比冰分界附近的高度低> 1000 m。在冰区附近的三个位置表明，在过去约50年中，平均表面温度已升高约1至1.5 K，尽管这种变暖的发生和持续时间因位置而异。另一方面，在Recovery Lake B站点检测到略微冷却至无变化。尽管由于方法的局限性仍存在不确定性，但这些结果增加了在南极东部出现有趣的近期气候模式的可能性。冰层附近的变暖趋势明显，而冰层的冷却则没有变化。

著录项

  • 作者

    Muto, Atsuhiro.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Physical Geography.;Climate Change.;Geophysics.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 227 p.
  • 总页数 227
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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