中国空间科学技术2023，Vol.43Issue(6)：125-134,10.DOI:10.16708/j.cnki.1000-758X.2023.0091
陆地生态系统碳监测卫星多角度偏振成像仪细粒子气溶胶反演
Retrieval of fine-mode aerosol based on Directional Polarimetric Camera onboard Terrestrial Ecosystem Carbon Inventory Satellite
摘要
Abstract
Fine-mode aerosol optical depth is a key parameter required for atmospheric environment monitoring and climate change assessment.Directional Polarimetric Camera(DPC)onboard the Terrestrial Ecosystem Carbon Inventory Satellite(CM-1)launched in August 2022 was systematically introduced.A major improvement of DPC/CM-1 over other DPC sensors is that the nadir spatial resolution increased from 3.3 km to 2.4 km.According to the sensor and data characteristics of DPC/CM-1,a cloud detection method based on polarimetric and spectral/spatial texture characteristics was developed,and the multi-angle observation was coupled to achieve strict cloud pixel identification.The results of DPC/CM-1 cloud detection show that this method has good detection effect for bright surface such as desert areas,dark surface such as vegetation and hill areas,and the sun-glint and non-sun-glint areas over ocean.An improved fine-mode aerosol optical depth(FAOD)retrieval algorithm was developed.The FAOD retrievals were verified by the data of Aerosol Robotic Network.The validation results show that the slope of the fitted line reaches more than 0.95,and nearly 73％of the observed data are distributed within the expected error,indicating the reliability of the retrieval algorithm.The retrieval results of FAOD clearly show the spatial distribution characteristics of global FAOD.The high FAOD regions(reaching 0.7-0.9)mainly include India and Central Africa,where the high fine particle aerosol contents are probably due to the dense population distribution,strong industrial/agricultural emissions and biomass combustion.The preliminary retrieval results of DPC/CM-1 during the in-orbit test phase show its potential for atmospheric environment monitoring and pollution transport analysis,especially when combined with its high spatial resolution,providing fine-scale atmospheric parameter retrieval results.关键词
陆地生态系统碳监测卫星/多角度偏振成像仪/卫星遥感/细粒子气溶胶光学厚度/云检测/在轨测试Key words
Terrestrial Ecosystem Carbon Inventory Satellite/Directional Polarimetric Camera/satellite remote sensing/fine-mode aerosol optical depth/cloud detection/in-orbit test分类
天文与地球科学引用本文复制引用
谢一凇,张罗,王羿,涂碧海,朱梦瑶,范兰兰,李正强,洪津,林军,郑杨,董鉴韬,伽丽丽,马䶮..陆地生态系统碳监测卫星多角度偏振成像仪细粒子气溶胶反演[J].中国空间科学技术,2023,43(6):125-134,10.基金项目
国家自然科学基金(42175147) （42175147）
海南省重点研发科技合作方向项目(ZDYF2020206) （ZDYF2020206）
国家杰出青年科学基金(41925019) （41925019）
