Spatiotemporal variation of ice sheet melting in the Antarctic coastal marginal zone and the influence of ice lenses and rain using satellite microwave observation
Spatiotemporal variation of ice sheet melting in the Antarctic coastal marginal zone and the influence of ice lenses and rain using satellite microwave observation
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DOI：
10.1016/j.polar.2020.100561
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发表时间：
2020-07
期刊：
影响因子：
1.8
通讯作者：
N. Alimasi;H. Enomoto;N. Hirasawa
中科院分区：
文献类型：
--
作者：
N. Alimasi;H. Enomoto;N. Hirasawa
这项研究利用卫星微波观测来研究南极洲斜坡上融化冰盖的时空变化。这些观测主要集中在昭和站附近的沿海边缘地区和内陆横贯路线。使用 36 GHz 垂直极化日振幅变化 (DAV) 检测熔化。 EOS 先进微波扫描辐射计 (AMSR-E) 和 AMSR2 分别在 2002 年至 2011 年和 2012 年至 2017 年期间的数据显示，DAV 随时间变化。据估计，最大的融化发生在2003/2004年夏季；即使在内陆地区，DAV 也有所上升。相比之下，日本南极考察队在 2004 年和 2012 年报告称，降雨期间 DAV 下降。这是由于夜间亮温 (TB) 上升所致。而下雨的信号仅限于较低的区域。沿海地区结核病发病率较低。沿海排放量低可能归因于沿海雪层下重新冻结的冰晶状体。随着白天和夜间之间的对比度从这个低结核病区开始增加，DAV 可能会很重要。
This study uses satellite microwave observations to examine the spatiotemporal variations of melting ice sheets on the slopes of Antarctica. These observations were focused on the coastal marginal zone and inland traverse route near Syowa Station. Melting was detected using a 36 GHz vertical polarization diurnal amplitude variation (DAV). Data from the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) and AMSR2 during 2002–2011 and 2012–2017, respectively, showed DAV variations over time. It was estimated that the greatest melting extent occurred during the 2003/2004 summer; the DAV rose even in the inland areas. In contrast, DAV decreased during rain periods, which was reported by the Japanese Antarctic Research Expedition in 2004 and 2012. This is due to the rise in nighttime brightness temperature (TB). whereas the signal from rain was limited to the lower area. Coastal zones showed a low TB. The low coastal emissions may be attributed to the refrozen ice lenses under the coastal snow layers. The DAV can be significant as the contrast between daytime and nighttime increases from this low TB zone.