A wideband radar for high-resolution mapping of near-surface internal layers in glacial ice
A wideband radar for high-resolution mapping of near-surface internal layers in glacial ice
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DOI：
10.1109/tgrs.2004.823451
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发表时间：
2004-03-01
影响因子：
8.2
通讯作者：
Braaten, D
中科院分区：
文献类型：
--
作者：
Kanagaratnam, P;Gogineni, SP;Braaten, D
积雪率是确定极地冰盖物质平衡的一个重要参数。目前的积累速率是通过分析冰芯和雪坑来确定的。由于对冰盖积累的空间变化采样不足，导致累积率的不确定性高达24%。我们设计并开发了600-900 mhz的机载雷达系统，用于近地表内层的高分辨率测绘，以估计极地冰盖的积累速率。我们的雷达系统可以通过绘制冰盖等时层的连续剖面图来提供更好的空间和时间覆盖。在2002年的格陵兰野外季节，我们成功地绘制了干雪区200 m、渗透区120 m和融化区20 m的近地表层。从1964年到1992年，NASA-U_1站点的水当量积累速率为34.9 +/- 5.1 cm/年。这与同期由冰芯推导出的34.6 cm/年的累积速率非常吻合。
Snow accumulation rate is an important parameter in determining the mass balance of polar ice sheets. Accumulation rate is currently determined by analyzing ice cores and snow pits. Inadequate sampling of the spatial variations in the ice sheet accumulation has resulted in accumulation rate uncertainties as large as 24%. We designed and developed a 600-900-MHz airborne radar system for high-resolution mapping of the near-surface internal layers for estimating the accumulation rate of polar ice sheets. Our radar system can provide improved spatial and temporal coverage by mapping a continuous profile of the isochronous layers in the ice sheet. During the 2002 field season in Greenland, we successfully mapped the near-surface layers to a depth of 200 m in the dry-snow zone, 120 m in the percolation zone, and 20 m in the melt zone. We determined the water equivalent accumulation rate at the NASA-U_1 site to be 34.9 +/- 5.1 cm/year from 1964 to 1992. This is in close agreement with the ice-core derived accumulation rate of 34.6 cm/year for the same period.