Interannual variability in sea-ice thickness in the pack-ice zone off Lützow-Holm Bay, East Antarctica
Interannual variability in sea-ice thickness in the pack-ice zone off Lützow-Holm Bay, East Antarctica
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DOI：
10.1016/j.polar.2015.10.003
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发表时间：
2016-03
期刊：
影响因子：
1.8
通讯作者：
Fuko Sugimoto;T. Tamura;H. Shimoda;S. Uto;D. Simizu;K. Tateyama;Seita Hoshino;Toshihiro Ozeki;Y. Fukamachi;S. Ushio;K. Ohshima
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文献类型：
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作者：
Fuko Sugimoto;T. Tamura;H. Shimoda;S. Uto;D. Simizu;K. Tateyama;Seita Hoshino;Toshihiro Ozeki;Y. Fukamachi;S. Ushio;K. Ohshima
根据日本南极研究考察（JARE）计划，自2000/01年以来，在夏季（12月中旬至1月上旬），使用破冰船白濑号上的电磁感应（EM）仪器对Lützow-Holm湾（东南极洲）外的海冰厚度进行了常规监测。这些数据的分析超过10年的时间，结合直观的观察，使用简化形式的ASPeCt（南极海冰过程和气候）协议，表明在这一地区的海冰厚度有很强的年际变化。对于重复的浮冰观测区，九个季节的海冰平均厚度为1.9米，2010/11和2011/12年观测到的海冰平均厚度特别大，分别为1.33米和1.58米。这一结果与海冰动力学的区域模式密切相关。2011/12年异常北风造成的冰汇聚特别多，表明该季节观测到的极厚冰主要是海冰变形过程（包括压力脊）造成的。对过去34年数据的长期分析证实，夏季吕措-霍尔姆湾外的海冰状况和厚度主要由12月的大尺度气压模式决定。
Under the Japanese Antarctic Research Expedition (JARE) program, sea-ice thickness has been routinely monitored off Lützow–Holm Bay (East Antarctica) during the summer (mid-December to early January) since 2000/01, using an electromagnetic induction (EM) instrument onboard the icebreakerShirase. Analysis of these data over a 10-year period, combined with visual observations using a simplified form of the ASPeCt (Antarctic Sea ice Processes and Climate) protocol, suggests a strong interannual variability in sea-ice thickness in this region. For the repeat pack-ice observation area, where the sea-ice thickness averaged over the nine seasons is ∼1.9 m, mean thicknesses of observed sea-ice in 2010/11 and 2011/12 are exceptionally large, at ∼3.3 and ∼5.8 m, respectively. This result is strongly related to regional patterns of sea ice dynamics. Ice convergence caused by anomalous northerly winds was particularly high in 2011/12, suggesting that the extremely thick ice observed in that season resulted largely from sea-ice deformation processes (including pressure ridging). Longer-term analysis of data from the past 34 years confirms that sea-ice conditions and thickness off Lützow–Holm Bay in summer are determined mainly by the large-scale pattern of atmospheric pressure in December.