IPS在基于系泊冰層剖面聲吶的楚科奇海東北沿岸海域海冰厚度數據中的應用
Abstract
Time series ice-draft data were obtained from moored ice-profiling sonar (IPS), in the coastal northeastern Chukchi Sea during 2009/10. Time series data show seasonal growth of sea-ice draft, occasionally interrupted by coastal polynya. The sea-ice draft distribution indicates a slightly lower abundance of thick, deformed ice compared with the eastern Beaufort Sea. In January, a rapid increase in the abundance of thick ice coincided with a period of minimal drift indicating compaction again the coast and dynamical thickening. The overall mean draft and corresponding derived thickness are 1.27 and 1.38 m, respectively. The evolution of modal ice thickness observed can be explained mostly by thermodynamic growth. The derived ice thicknesses are used to estimate heat losses based on ERAinterim data. Heat losses from the raw, 1 s IPS data are ～50 and 100% greater than those calculated using IPS data averaged over spatial scales of ～20 and 100 km, respectively. This finding demonstrates the importance of subgrid-scale ice-thickness distribution for heat-loss calculation. The heat-loss estimate based on thin ice data derived from AMSR-E data corresponds well with that from the 1 s observed ice-thickness data, validating heat-loss estimates from the AMSR-E thin ice-thickness algorithm.
摘要：
2009/10年期間，從楚科奇海東北部沿海的系泊冰剖面聲納（IPS）獲得了時間序列冰吃水數據。時間序列數據顯示了海冰吃水的季節性增長，偶爾會被沿海的冰間湖打斷。海冰吃水分布表明，與波弗特海東部相比，厚變形冰的豐度略低。1月，厚冰豐度的迅速增加與最小漂移期相吻合，表明海岸再次壓實和動態增厚。總體平均吃水深度和相應的推導厚度分別為1.27米和1.38米。觀測到的模態冰厚度的演變主要可以用熱力學增長來解釋。根據ERA中期數據，得出的冰層厚度用于估算熱損失。原始1秒IPS數據的熱損失分別比使用IPS數據在約20和100公里的空間尺度上平均計算的熱損失高出約50%和100%。這一發現表明了亞網格尺度冰厚分布對熱損失計算的重要性。基于AMSR-E數據得出的薄冰數據的熱損失估算與1秒觀測到的冰厚數據的熱損耗估算非常吻合，驗證了AMSR-E薄冰厚度算法的熱損失估計。
關鍵詞：IPS冰剖面儀，冰厚度監測，聲學后向散射，海冰、海冰地球物理學、海冰生長和衰減。
