Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data
Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data
复制标题
基于ICESat数据的鄂霍次克海海冰厚度和体积估算
DOI：
10.1017/aog.2018.8
复制
发表时间：
2018
影响因子：
2.9
通讯作者：
T. Toyota
中科院分区：
文献类型：
--
作者：
Nihashi;S.;N. T. Kurtz;T. Markus;K. I. Ohshima;K. Tateyama;T. Toyota
在流体静力平衡假设下，根据ICESat干舷数据估计了鄂霍次克海2004-2008年的海冰厚度。2004-2008年平均总冰厚（包括雪深）为95厘米。htot年际变化较大；从77.5厘米（2008）到110.4厘米（2005）。温度模式从50-60厘米（2007年和2008年）到70-80厘米（2005年）不等。通过与日本北海道附近的破冰船“大豆号”上的电磁感应仪观测到的冰厚进行比较，验证了由ICESat数据得出的冰厚。htot年图显示，每年htot的空间分布是相似的。根据ICESat导出的htot和AMSR-E导出的冰浓度估计冰体积为6.3 × 1011 m3。与冰面积的比较表明，冰体积不能总是由面积单独表示，尽管面积已被用作鄂霍次克海体积的代表。冰量大致相当于根据热收支计算估计的主要沿海冰融带的年冰量。这也支持了利用ICESat数据估算海冰厚度和体积的有效性。
Sea-ice thickness in the Sea of Okhotsk is estimated for 2004–2008 from ICESat derived freeboard under the assumption of hydrostatic balance. Total ice thickness including snow depth (htot) averaged over 2004–2008 is 95 cm. The interannual variability of htot is large; from 77.5 cm (2008) to 110.4 cm (2005). The mode of htot varies from 50–60 cm (2007 and 2008) to 70–80 cm (2005). Ice thickness derived from ICESat data is validated from a comparison with that observed by Electromagnetic Induction Instrument (EM) aboard the icebreaker Soya near Hokkaido, Japan. Annual maps of htot reveal that the spatial distribution of htot is similar every year. Ice volume of 6.3 × 1011 m3 is estimated from the ICESat derived htot and AMSR-E derived ice concentration. A comparison with ice area demonstrates that the ice volume cannot always be represented by the area solely, despite the fact that the area has been used as a proxy of the volume in the Sea of Okhotsk. The ice volume roughly corresponds to that of annual ice production in the major coastal polynyas estimated based on heat budget calculations. This also supports the validity of the estimation of sea-ice thickness and volume using ICESat data.