IPS在基于系泊冰层剖面声呐的楚科奇海东北沿岸海域海冰厚度数据中的应用
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年期间，从楚科奇海东北部沿海的系泊冰剖面声纳（IPS）获得了时间序列冰吃水数据。时间序列数据显示了海冰吃水的季节性增长，偶尔会被沿海的冰间湖打断。海冰吃水分布表明，与波弗特海东部相比，厚变形冰的丰度略低。1月，厚冰丰度的迅速增加与最小漂移期相吻合，表明海岸再次压实和动态增厚。总体平均吃水深度和相应的推导厚度分别为1.27米和1.38米。观测到的模态冰厚度的演变主要可以用热力学增长来解释。根据ERA中期数据，得出的冰层厚度用于估算热损失。原始1秒IPS数据的热损失分别比使用IPS数据在约20和100公里的空间尺度上平均计算的热损失高出约50%和100%。这一发现表明了亚网格尺度冰厚分布对热损失计算的重要性。基于AMSR-E数据得出的薄冰数据的热损失估算与1秒观测到的冰厚数据的热损耗估算非常吻合，验证了AMSR-E薄冰厚度算法的热损失估计。
关键词：IPS冰剖面仪，冰厚度监测，声学后向散射，海冰、海冰地球物理学、海冰生长和衰减。
