应用风云三号D星微波数据估算北极海冰面积和边缘线的精度评估  

Accuracy evaluation of Arctic sea ice area and edge line from Fengyun-3D microwave data

作　　者：杨子健 王泽民[1,2,3] 刘婷婷 Yang Zijian;Wang Zemin;Liu Tingting(Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China;Key Laboratory of Polar Surveying and Mapping,Ministry of Natural Resources,Wuhan 430079,China;Hubei Luojia Laboratory,Wuhan 430079,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]自然资源部极地测绘科学重点实验室,湖北武汉430079 [3]湖北珞珈实验室,湖北武汉430079

出　　处：《极地研究》2023年第1期46-58,共13页Chinese Journal of Polar Research

基　　金：国家自然科学基金(41941010);湖北省自然科学基金重点类项目(2019CFA057);国家重点研发计划(2018YFC1406102)资助。

摘　　要：风云三号D星搭载的微波成像仪(microwave radiation imager,MWRI)可提供被动微波数据以实现全北极尺度的海冰面积和海冰边缘线研究。基于MWRI数据获取北极海冰面积和海冰边缘线的相关研究较少,且精度验证工作不足。使用基于6种算法的MWRI数据的海冰密集度结果,提取北极的海冰面积和海冰边缘线,将专用传感器微波成像仪/探测仪(special sensor microwave imager/sounder,SSMIS)和先进微波扫描辐射计(advanced microwave scanning radiometer 2,AMSR2)数据作为对比,使用中分辨率成像光谱仪(Moderate-Resolution Imaging Spectroradiometer,MODIS)融合产品(2019年8月26日—12月31日)评估精度。结果表明,MWRI数据的海冰面积随时间变化的趋势与MODIS融合产品基本保持一致。MWRI提取的海冰边缘线相比SSMIS更接近MODIS融合产品获得的结果,均方根误差约为20~30 km。这些差异主要和数据间时空分辨率有关。总之,MWRI具有较优的性能,在北极海冰参数的监测研究中极具潜力。The microwave radiation imager(MWRI)aboard the Fengyun-3D satellite passively acquires microwave data,from which the area and edge line of Arctic sea ice are derived.MWRI data have seldom been used in related scientific studies,therefore their accuracy has not been sufficiently evaluated.This study combines sea ice concentration(SIC)results from six MWRI data processing algorithms to extract Arctic sea ice area and edge line,which are compared with results from the special sensor microwave imager/sounder(SSMIS)system and from the advanced microwave scanning radiometer 2(AMSR2).Then,the SIC product derived from merged Moderate Resolution Imaging Spectrometer(MODIS)and AMSR2 observations(from 26 August 2019 to 31 December 2019,aboard NASA Terra and Aqua satellite)is used to evaluate MWRI data accuracy.The temporal variation trend of MWRI sea ice area is consistent with that of the merged MODIS-AMSR2 product.The sea ice edge line extracted from MWRI data is in better agreement with the merged MODIS-AMSR2 SIC product,with a root mean square error of 20~30 km,than with the SSMIS product.These differences are mainly caused by spatio-temporal resolution discrepancies between the datasets.In conclusion,the MWRI shows better performance than comparable instruments and is best suited for Arctic sea ice research and monitoring.

关 键 词：风云三号D星 专用传感器微波成像仪/探测仪 MODIS 北极海冰 海冰面积 海冰边缘线 

分 类 号：P715.7[天文地球—海洋科学] P941.62