基于北极多源卫星数据的海冰厚度时空变化对比与评估  

Comparison and assessment of data on multi-source satellite remote sensing Arctic sea ice thickness

作　　者：靳娅琪 张瑜 陈长胜 徐丹亚 Jin Yaqi;Zhang Yu;Chen Changsheng;Xu Danya(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;School for Marine Science and Technology,University of Massachusetts Dartmouth,New Bedford,Massachusetts 02744,USA)

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]马萨诸塞大学达特茅斯分校海洋科学与技术学院,马萨诸塞州新贝德福德市02744,美国

出　　处：《极地研究》2023年第2期238-250,共13页Chinese Journal of Polar Research

基　　金：上海市自然科学基金(22ZR1427400);国家重点研发计划(2019YFA0607001);国家自然科学基金(42130402,41706210);南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311021009)资助。

摘　　要：海冰厚度作为海冰的重要变量之一,相较于海冰密集度、海冰漂移速度、海冰范围等,数据时空完整性仍然不足。当前获取北极海冰厚度的主要手段为卫星遥感,除之前的CryoSat-2、SMOS等卫星,2018年11月又新增了ICESat-2卫星。目前,针对北极多源卫星海冰厚度的时空变化差异性对比以及数据精度评估的工作较少,因此,本研究通过选取最近的完整两年(2019—2020年)内的ICESat-2、CryoSat-2以及CS2SMOS(CryoSat-2和SMOS融合产品)海冰厚度数据进行对比分析,量化其时空差异。结果显示,整体上CryoSat-2卫星数据的平均海冰厚度最大,ICESat-2其次,CS2SMOS最小。三种卫星数据间的差异具有明显的时空变化特征,在海冰厚度高值区ICESat-2数据的厚度最大,CryoSat-2与CS2SMOS数据的厚度相近,而在海冰边缘区CryoSat-2数据的厚度最大,CS2SMOS最小。从区域来看,不同卫星数据反演的海冰厚度在东西伯利亚海和波弗特海区域差异较小,在巴伦支海区域差异较大。在此基础上,利用研究时段内的“冰桥行动”实地观测数据对多源卫星数据进行评估,结果表明,2019年4月CS2SMOS数据整体上与实地观测数据更接近,而ICESat-2数据与实地观测数据相差较大。Sea ice thickness is one of the important variables of sea ice.Our knowledge of the temporal and spatial integrity of sea ice thickness is still insufficient and lags behind that of sea ice concentration,extent,and drift velocity.At present,Arctic sea ice thickness data are mostly obtained by satellite remote sensing using CryoSat-2 and SMOS,and since November 2018,ICESat-2.Few studies have evaluated the accuracy of the latest multi-source satellite Arctic sea ice thickness data or assessed the spatial and temporal differences of data from different sources.In this study,we quantified the spatial and temporal differences between the latest sea ice thickness data from ICESat-2,CryoSat-2,and CS2SMOS(merged product of CryoSat-2 and SMOS)during 2019–2020.Results show that the mean sea ice thickness is largest in CryoSat-2,second largest in ICESat-2,and smallest in CS2SMOS.There are also considerable temporal and spatial differences.For regions covered with thick sea ice,thickness is largest in ICESat-2,and the thickness in Cryosat-2 is similar to that in CS2SMOS.For marginal ice zones,thickness is largest in CryoSat-2 and smallest in CS2SMOS.The difference between the datasets is smaller over the East Siberian Sea and Beaufort Sea and larger over the Barents Sea.We compared the satellite data with field data collected during Operation Ice-Bridge(OIB)in April 2019 and found that the difference between CS2SMOS and OIB is smaller than that between ICESat-2 and OIB.

关 键 词：北极 海冰厚度 卫星遥感 冰桥行动 

分 类 号：P731.15[天文地球—海洋科学] P715.7