极地研究2025，Vol.37Issue(4)：681-701,21.DOI:10.13679/j.jdyj.20240058
基于MODIS热红外数据的北极冰间水道产品不确定性评估
Uncertainty assessment of Arctic sea ice lead products based on MODIS thermal infrared data
摘要
Abstract
Monitoring the spatial and temporal distribution of Arctic sea ice is important for improving our under-standing of oceanic heat flux and sea-air mass exchange in the polar regions and for supporting the potential opening of Arctic shipping routes.Moderate resolution imaging spectroradiometer(MODIS)thermal infra-red data,characterized by high spatial and temporal resolution and large coverage,are widely used to iden-tify leads(ice-free waterways)in sea ice.However,there are significant discrepancies and uncertainties in the different products.This paper compares and evaluates the accuracy of three major thermal infrared lead products(the Willmes,Reiser,and Hoffman products,respectively)and analyzes lead extraction uncertain-ties and their sources.The results show that there are significant discrepancies between the daily lead areas in the three products,with the Willmes,Hoffman,and Reiser products extracting 53.1%,106.0%,and 140.8%of the daily average lead area,respectively.There are three main sources of uncertainty in lead ex-traction:(1)narrow leads are inadequately extracted,resulting in misclassification rates exceeding 50%in all three products.(2)All three products are daily synthesis products that are based on the multiperiod ther-mal infrared data of a single day.Because of sea ice drift,the same lead is extracted repeatedly at different locations,resulting in overestimation of the width and area of rapidly drifting leads.(3)The Willmes and Reiser products are designed with a fuzzy cloud artifact filter(FCAF)to mitigate the effects of clouds and other high-temperature features on the extraction of ice-covered waterways.However,the different FCAF algorithms result in significant discrepancies in the extraction of the extent of ice-covered waterways.The results of this study can serve as a reference for the use of lead products in a variety of applications.关键词
冰间水道/中分辨率成像光谱仪(MODIS)/热红外/不确定性/北极Key words
sea ice lead/moderate resolution imaging spectroradiometer(MODIS)/thermal infrared/un-certainty/Arctic引用本文复制引用
翁志龙,刘岩,贾鹏,王彩虹,程晓,陈卓奇..基于MODIS热红外数据的北极冰间水道产品不确定性评估[J].极地研究,2025,37(4):681-701,21.基金项目
国家自然科学基金(42276246,41925027)资助 （42276246,41925027）
