HY-2卫星反演海冰密集度在北极地区的适用性评估-海洋预报

HY-2卫星反演海冰密集度在北极地区的适用性评估

单位：1. 国家海洋局空间海洋遥感与应用研究重点实验室, 北京 100081;
2. 国家海洋环境预报中心, 北京 100081;
3. 中国海洋大学海洋与大气学院, 山东青岛 266100;
4. 国家海洋局天津海洋环境监测中心站, 天津 300450

关键词：海洋二号卫星海冰密集度海冰范围北极数据同化对比评估

分类号：P731.15

出版年·卷·期（页码）：2018·35·第六期（84-91）

摘要：

评估了我国自主研发的海洋二号卫星（HY-2）海冰密集度产品在北极地区的适用性。与8种国际同类产品相比，HY-2产品的分辨率为25 km，属于低分辨率产品。HY-2产品2012年夏季的空间分布特征和其他产品差别不大，但在低密集度冰区和边缘区域的差异可达0.15~0.25。HY-2产品可以反映2012年7-10月海冰面积先减小后增大的规律，但最小海冰范围的出现时间比其他产品偏早，且平均值偏小。利用北极海冰数值预报系统进行的同化试验显示，HY-2产品可以有效改善海冰密集度的模拟结果，将平均偏差从控制试验的0.18~0.24减小为同化试验的0.05~0.08，改善效果和国际认可和常用的AMSR2/ASI产品相当。

The HY-2 product released by National Satellite Ocean Application Service was assessed in this paper. The results showed that the resolution HY-2 is 25 km and belongs to low resolution series, compared to eight international datasets. The spatial distribution is similar between HY-2 and other datasets, but differences still exists in the low concentration and marginal area, up to 0.15~0.25. The HY-2 daily mean extent from July to October, 2012 captured the seasonal evolution, but suggested an earlier minimum time and much smaller values. The assimilation experiments performed by the Arctic sea ice numerical forecast system showed that sea ice concentration was significantly improved by nudging HY-2 to the forecast system, decreasing the bias from 0.18~0.24 to 0.05~0.08, comparable to the AMSR2/ASI results.

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