基于CryoSat-2卫星测高数据的北极海冰体积估算方法

发布时间：2018-05-08 08:18

本文选题：CryoSat- + 海冰类型　；参考：《海洋学报》2017年03期

【摘要】：近30年来,北极海冰正发生着剧烈的变化。海冰体积是量化海冰变化的重要指标之一。本文以2015年CryoSat-2卫星测高数据和OSI SAF海冰类型产品为基础。提取了浮冰出水高度、积雪深度、海冰密集度、海冰类型等属性信息,通过数据内插、投影变换、栅格转换、空间重采样等工作将海冰属性信息统一为25km×25km分辨率的栅格数据集。根据流体静力学平衡原理,逐个估算栅格像元对应的海冰厚度值,将其与对应的海冰面积相乘,估算了北极海冰密集度大于75%海域的海冰体积,并分析了海冰厚度和体积的月变化和季节变化特征。用NASA IceBridge海冰厚度产品对反演的海冰厚度进行验证。结果表明二者相关系数为0.72,有较高的一致性。北极海冰平均厚度春季最大,夏季最小,分别约为2.99m和1.77m,最厚的海冰集中在格陵兰沿岸北部和埃尔斯米尔半岛以北海域。多年冰平均厚度大于一年冰。冬季海冰体积最大,约为23.30×103 km3,经过夏季的融化,减少了近70%。一年冰体积季节波动较大,而多年冰体积相对稳定,季节变化不明显。
[Abstract]:Arctic sea ice has been changing dramatically for nearly 30 years. The volume of sea ice is one of the important indexes to quantify the change of sea ice. This paper is based on the 2015 CryoSat-2 satellite altimetry data and OSI SAF sea ice type products. The attribute information such as water height, snow depth, sea ice density, sea ice type and so on were extracted. The attribute information of sea ice was unified into a raster data set with 25km 脳 25km resolution through data interpolation, projection transformation, grid conversion, spatial resampling and so on. According to the hydrostatic equilibrium principle, the sea ice thickness corresponding to the grid pixel is estimated one by one, and the sea ice volume of the Arctic sea ice density greater than 75% is estimated by multiplying it with the corresponding sea ice area. The monthly and seasonal variations of sea ice thickness and volume are analyzed. The inverse sea ice thickness is verified by NASA IceBridge sea ice thickness product. The results show that the correlation coefficient is 0.72, and there is a high consistency between them. The average thickness of Arctic sea ice is the largest in spring and the smallest in summer, about 2.99 m and 1.77 m, respectively. The thickest sea ice is concentrated in the northern part of Greenland coast and north of the Els Mill Peninsula. The average thickness of multi-year ice is greater than that of one year. The volume of sea ice in winter is the largest, about 23.30 脳 10 ~ 3 km ~ (3). After melting in summer, the volume of sea ice decreases by nearly 70%. The annual ice volume fluctuates greatly in season, but the annual ice volume is relatively stable, and the seasonal variation is not obvious.
【作者单位】：南京大学地理与海洋科学学院;中国南海研究协同创新中心;
【基金】：国家自然科学基金(41371391) 国家重点研发计划项目(2016YFA0600102)
【分类号】：P731.15;P714.1

【相似文献】