Spatial–temporal patterns of surface melting observed over Antarctic ice shelves using scatterometer data
Spatial–temporal patterns of surface melting observed over Antarctic ice shelves using scatterometer data
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DOI：
10.1017/s0954102014000832
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发表时间：
2015-02
影响因子：
1.6
通讯作者：
S. Oza
中科院分区：
文献类型：
--
作者：
S. Oza
摘要南极冰架与大气和海洋直接接触，是气候变化的敏感指标。大气变暖引起的融水从地表渗透到水力裂缝中，影响陆架稳定性。表面熔化减少了微波后向散射，因此后向散射数据是有用的熔体监测。利用Ku波段散射仪导出的融化指数（MI）评估南极冰架上空观测到的十年（2000-10）变化。讨论了在大型冰架上观测到的低强度融化和在拉森、埃默里、韦斯特和沙克尔顿冰架上观测到的高强度融化。在Amery冰架上，MI变化和裂缝传播之间的相关性约为93%。还研究了厄尔尼诺和南方涛动与MI的相关性。该文件强调，散射计派生的信息有可能评估融水生产和裂缝传播。
Abstract Ice shelves fringing Antarctica are sensitive indicators of climate change due to the direct interface with the atmosphere and ocean. Meltwater induced by atmospheric warming percolates from the surface into hydrofractures and affects shelf stability. Surface melting reduces the microwave backscattering; thus backscatter data is useful in melt monitoring. The Ku-band scatterometer derived melting index (MI) was utilized to assess the decadal (2000–10) variability observed over Antarctic ice shelves. The low intensity melting observed over large ice shelves and high intensity melting observed over the Larsen, Amery, West and Shackleton ice shelves are discussed. A correlation of around 93% was observed between MI variation and rift propagation over Amery Ice Shelf. The El Niño and the Southern Oscillation (ENSO) correlation with MI was also investigated. The paper highlights that scatterometer derived information has the potential to assess meltwater production and rift propagation.