Sea ice thickness in the southwestern Sea of Okhotsk revealed by a moored ice‐profiling sonar
Sea ice thickness in the southwestern Sea of Okhotsk revealed by a moored ice‐profiling sonar
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DOI：
10.1029/2005jc003327
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发表时间：
2006-09
影响因子：
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通讯作者：
Y. Fukamachi;G. Mizuta;K. Ohshima;T. Toyota;N. Kimura;M. Wakatsuchi
中科院分区：
文献类型：
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作者：
Y. Fukamachi;G. Mizuta;K. Ohshima;T. Toyota;N. Kimura;M. Wakatsuchi
[1]使用系泊的冰剖面声纳沿着与系泊的声学多普勒海流剖面仪，总的空间截面的草案，通过3334公里的海冰，在1999年至2001年的冬季在鄂霍次克海西南部附近的北海道。利用该吃水资料，首次讨论了该海域的平均吃水和龙骨统计。三个冬季的平均吃水为0.60 m，对应厚度为0.71 m，每个冬季的变化范围为0.49-0.72 m。水平冰和变形冰的分类揭示了月平均水平冰吃水的小范围（0.18-0.27 m）和变形冰在体积方面的优势（80%）。平均吃水随变形冰面积比的变化相当好。这些结果表明，动态过程，如脊和漂流是重要的，在该地区的观察草案的演变。观测到的吃水概率密度分布和龙骨统计表明，厚冰比和龙骨频率低于极地地区的同类资料，而更接近格陵兰岛以西戴维斯海峡的观测结果。沿着由卫星资料得到的冰浓度和冰速度，根据观测到的海冰厚度估算了向鄂霍次克海西南部的南向冰输送。估计冰运输范围从15到70公里3，在每个冬天。与冰输送相关的热量和淡水输送范围分别为−3.9 × 1017至−1.8 × 1018 J和12至57 km 3。
[1] Using a moored ice-profiling sonar along with a moored acoustic Doppler current profiler, a total spatial section of draft across 3334 km of sea ice was obtained in the southwestern Sea of Okhotsk near Hokkaido in the winters of 1999–2001. Using this draft data set, the average draft and keel statistics are discussed in this sea for the first time. The mean draft was 0.60 m, which corresponds to the thickness of 0.71 m, over the three winters with the range of 0.49–0.72 m for each winter. The classification of level and deformed ice reveals a small range of the monthly mean level ice draft (0.18–0.27 m) and the dominance of the deformed ice in terms of volume (80%). The mean draft varied with the areal ratio of the deformed ice fairly well. These results suggest that dynamic processes such as ridging and rafting are important for the evolution of draft in the region of observation. The observed draft probability density distribution and keel statistics show that the thick ice ratio and keel frequency are lower than the similar data in polar regions and closer to those observed in Davis Strait west of Greenland. Along with the ice concentration and speed derived from the satellite data the southward ice transport to the southwestern Sea of Okhotsk is estimated on the basis of the observed sea ice thickness. The estimated ice transport ranged from 15 to 70 km3 in each winter. The heat and freshwater transport associated with the ice transport ranged from −3.9 × 1017 to −1.8 × 1018 J and from 12 to 57 km3, respectively.