A Satellite-Based Climatology of Wind-Induced Surface Temperature Anomalies for the Antarctic
A Satellite-Based Climatology of Wind-Induced Surface Temperature Anomalies for the Antarctic
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DOI：
10.3390/rs11131539
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
G. Heinemann;Lukas Glaw;S. Willmes
中科院分区：
文献类型：
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作者：
G. Heinemann;Lukas Glaw;S. Willmes
众所周知，下降风可以作为南极冰盖斜坡表面温度的温暖信号被检测到。对于适当的天气强迫和/或地形沟道，下降涌浪发生，这导致温暖的签名也超过相邻的冰架。中分辨率成像光谱仪（MODIS）的冰面温度（IST）数据被用来检测温暖的签名在南极洲的冬季2002-2017年。此外，还使用了2002年至2016年的高分辨率（5公里）区域气候模式数据。我们提出了一个案例研究和气候的风引起的IST异常的罗斯冰架和东部威德尔海。在罗斯冰架上的伯德冰川和尼姆罗德冰川，冬季平均暖距平超过5 K，是一个强烈的气候信号。布伦特冰架的平均距平较弱，每年冬季约有70天超过5 K。模型模拟的IST相比，MODIS IST，并显示出非常好的协议。模型数据表明，近地表稳定性是一个更好的措施，风的响应比IST本身。
It is well-known that katabatic winds can be detected as warm signatures in the surface temperature over the slopes of the Antarctic ice sheets. For appropriate synoptic forcing and/or topographic channeling, katabatic surges occur, which result in warm signatures also over adjacent ice shelves. Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature (IST) data are used to detect warm signatures over the Antarctic for the winter periods 2002–2017. In addition, high-resolution (5 km) regional climate model data is used for the years of 2002 to 2016. We present a case study and a climatology of wind-induced IST anomalies for the Ross Ice Shelf and the eastern Weddell Sea. The IST anomaly distributions show maxima around 10–15K for the slopes, but values of more than 25K are also found. Katabatic surges represent a strong climatological signal with a mean warm anomaly of more than 5K on more than 120 days per winter for the Byrd Glacier and the Nimrod Glacier on the Ross Ice Shelf. The mean anomaly for the Brunt Ice Shelf is weaker, and exceeds 5K on about 70 days per winter. Model simulations of the IST are compared to the MODIS IST, and show a very good agreement. The model data show that the near-surface stability is a better measure for the response to the wind than the IST itself.