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(shù)據(jù)中的應(yīng)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?dāng)?shù)據(jù)。時間序列數(shù)據(jù)顯示了海冰吃水的季節(jié)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(tài)增厚。總體平均吃水深度和相應(yīng)的推導(dǎo)厚度分別為1.27米和1.38米。觀測到的模態(tài)冰厚度的演變主要可以用熱力學(xué)增長來解釋。根據(jù)ERA中期數(shù)據(jù)，得出的冰層厚度用于估算熱損失。原始1秒IPS數(shù)據(jù)的熱損失分別比使用IPS數(shù)據(jù)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(fā)現(xiàn)表明了亞網(wǎng)格尺度冰厚分布對熱損失計算的重要性。基于AMSR-E數(shù)據(jù)得出的薄冰數(shù)據(jù)的熱損失估算與1秒觀測到的冰厚數(shù)據(jù)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(guān)鍵詞：IPS冰剖面儀，冰厚度監(jiān)測，聲學(xué)后向散射，海冰、海冰地球物理學(xué)、海冰生長和衰減。
