北极海冰密度变化分析及其对海冰厚度估算的影响  

ANALYSES OF ARCTIC SEA ICE DENSITY VARIATION AND ITS IMPACT ON SEA ICE THICKNESS RETRIEVAL

作　　者：李冰洁 庞小平[1,2,3] 季青 Li Bingjie;Pang Xiaoping;Ji Qing(Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China;Key Laboratory of Polar Surveying and Mapping,National Administration of Surveying,Mapping and Geoinformation of China,Wuhan 430079,China;University Corporation for Polar Research,Beijing 100875,China)

机构地区：[1]武汉大学中国南极测绘研究中心,湖北武汉430079 [2]极地测绘科学国家测绘地理信息局重点实验室,湖北武汉430079 [3]中国高校极地联合研究中心,北京100875

出　　处：《极地研究》2019年第3期258-266,共9页Chinese Journal of Polar Research

基　　金：国家重点研发计划(2016YFC1402704,2017YFA0630104);国家自然科学基金(41576188,41606215)资助

摘　　要：海冰密度是海冰和气候模型的重要物理变量,也是利用卫星测高数据估算海冰厚度的关键参数。目前各国北极科学考察虽开展了海冰物理观测,但对近期北极海冰密度现场观测资料的综合分析和挖掘应用不足。在此背景下,收集了近15年来北极海冰密度现场观测资料,分析北极海冰密度的变化特征;对海冰密度实测数据进行克里金插值,将插值结果输入静力平衡方程模型计算海冰厚度,探讨海冰密度对海冰厚度卫星测高反演的影响。结果表明,2000—2015年北极海冰密度变化范围为750—950 kg·m^–3,1—9月海冰密度总体上随月份变化呈减小的趋势;6—9月北极海冰密度随着纬度的增加而减少(75°N—90°N);通过对比分析表明,相较于使用海冰密度固定值参与估算海冰厚度,采用经现场观测数据空间插值后的海冰密度估算海冰厚度的结果更为准确。北极海冰密度现场观测资料的整理分析可为海冰与气候变化等进一步研究提供参考。Sea ice density is an important variable of sea ice physics and climate models,and it is key parameter for the retrieval of sea ice thickness from satellite altimeters.Physical investigations of Arctic sea ice have been conducted during many scientific expeditions;however,in situ measurements of sea ice density acquired in recent years still require further sorting and analysis.In this context,we collected 15 years’ data of Arctic sea ice density.We analyzed the variability of sea ice density,calculated sea ice thickness,based on the hydrostatic equation with in situ sea ice density after applying Kriging interpolation,and discussed the influence of sea ice density on sea ice thickness retrieved via satellite altimetry.Results showed that the annual mean sea ice density varied from 750 to 950 kg·m^-3 during the period from 2000 to 2015.From January to September,the monthly mean sea ice density tended to decrease,and it generally decreased with latitude during June–September.Comparative analysis revealed it is more suitable to use sea ice density after data interpolation than to use a fixed constant density for sea ice thickness retrievals.Sorting and analysis of Arctic in situ sea ice density could provide a reference for further research on Arctic sea ice and climate change.

关 键 词：海冰密度 现场观测 变化分析 海冰厚度 

分 类 号：P731.15[天文地球—海洋科学]