基于FY3D/MERSI-II红外波段夏季北极云检测模型研究
投稿时间:2021-06-22  修订日期:2021-08-09  点此下载全文
引用本文:
摘要点击次数: 116
全文下载次数: 0
作者单位邮编
王曦 国家卫星气象中心 100081
刘健 国家卫星气象中心 100081
杨冰韵 国家卫星气象中心 
基金项目:国家重点研发计划“北极环境卫星遥感与数值预报合作平台建设”(2018 YFC1407200,2018YFC1407204);国家自然科学基金”空天地多源协同测云关键技术研究(61531019)
中文摘要:卫星遥感是北极区域观测的重要方式之一。但受到复杂大气和下垫面特征的影响,卫星被动遥感云检测算法及产品精度均面临较大的挑战。本研究基于我国风云极轨气象卫星FY-3D/MERSI-II(FengYun-3D/ Medium Resolution Spectral Imager-II) 红外通道数据,结合星载激光雷达主动探测数据,开展北极地区夏季云检测模型研究。采用概率密度函数分析方法,并引入损失率,对相关阈值进行优化,提出适用于北极夏季的红外云检测方案,构建了基于置信度结果的云检测模型。精度检验结果表明,所构建的云检测模型的检测结果与时空匹配的星载主动探测结果具有较高的一致性,个例统计结果显示置信度高于0.8,云像元检测一致性100%。当置信度低于0.2时,存在10.15%云像元误判为晴空像元,误判云像元多为云顶高度在4~6km之间的单层云,可能是卷云引起的误判。
中文关键词:北极  云检测  MERSI-II,FY3D
 
Research on summer Arctic cloud detection model based on FY-3D/MERSI-II infrared data
Abstract:Satellite is one of important observation data sources in Arctic. Due to the complex characteristics of atmospheric and underlying surface, it is extremely challenging for developing the cloud mask algorithm and the derived product accuracy in Arctic by satellite passive remote sensing. A summer cloud detection model in Arctic was studied based on FY-3D/MERSI-II (FengYun-3D/Medium Resolution Spectral Imager-II). Combined with the observations infrared cloud detection tests for the Arctic summer were proposed. The probability distribution density analysis method was adopted, and the loss rate was introduced to optimize the relevant thresholds. Meanwhile, the relevant thresholds were optimized to develop a cloud detection model based on the confidence levels. The validation results reveal that the cloud detection results are highly consistency with the matched CALIPSO observations. The high confidence levels basically represent the cloudy pixels, while the low values correspond to the clear ones. The case study shows that the ratio of cloudy pixels is 100% with confidence level higher than 0.8. When the confidence level is lower than 0.2, 10.15% of the cloudy pixels are still misjudged as clear pixels, which are primarily single-layer clouds with the cloud top heights between 4 and 6km. This may be caused Pby cirrus clouds and still need further study.
keywords:Arctic,cloud  detection, MERSI-II,FY-3D
  HTML  查看/发表评论  下载PDF阅读器

《红外与毫米波学报》编辑部