Sentinel-5P TROPOMI – Cloud Optical Thickness (COT), Level 3 – Global

The TROPOMI instrument onboard the Copernicus SENTINEL-5 Precursor satellite is a nadir-viewing, imaging spectrometer that provides global measurements of atmospheric properties and constituents on a daily basis. It is contributing to monitoring air quality and climate, providing critical information to services and decision makers. The instrument uses passive remote sensing techniques by measuring the top of atmosphere solar radiation reflected by and radiated from the earth and its atmosphere. The four spectrometers of TROPOMI cover the ultraviolet (UV), visible (VIS), Near Infra-Red (NIR) and Short Wavelength Infra-Red (SWIR) domains of the electromagnetic spectrum. The operational trace gas products generated at DLR on behave ESA are: Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Formaldehyde (HCHO), Carbon Monoxide (CO) and Methane (CH4), together with clouds and aerosol properties. This product displays the Cloud Optical Thickness (COT) around the globe. Clouds play a crucial role in the Earth's climate system and have significant effects on trace gas retrievals. The cloud optical thickness is retrieved from the O2-A band using the ROCINN algorithm. Daily observations are binned onto a regular latitude-longitude grid. This product is created in the scope of the project INPULS. It develops (a) innovative retrieval algorithms and processors for the generation of value-added products from the atmospheric Copernicus missions Sentinel-5 Precursor, Sentinel-4, and Sentinel-5, (b) cloud-based (re)processing systems, (c) improved data discovery and access technologies as well as server-side analytics for the users, and (d) data visualization services.搭载于哥白尼SENTINEL-5 Precursor卫星的TROPOMI仪器是一台天底观测型成像光谱仪，可每日获取全球大气属性与大气成分的观测数据，助力空气质量与气候监测，为相关服务机构及决策者提供关键支撑信息。 该仪器采用被动遥感技术，通过测量地球及其大气反射与辐射的大气顶太阳辐射完成观测。TROPOMI搭载的四台光谱仪覆盖电磁波谱的紫外线（UV）、可见光（VIS）、近红外（NIR）及短波红外（SWIR）波段。由DLR代表ESA生成的业务化痕量气体产品包括：臭氧（O₃）、二氧化氮（NO₂）、二氧化硫（SO₂）、甲醛（HCHO）、一氧化碳（CO）与甲烷（CH₄），以及云和气溶胶属性数据。 本产品展示全球范围内的云光学厚度（Cloud Optical Thickness, COT）。云在地球气候系统中发挥关键作用，且对痕量气体反演具有显著影响。云光学厚度通过ROCINN算法基于O₂-A波段反演得到，每日观测数据被网格化至规则的经纬网格中。 本产品系INPULS项目的研究成果。该项目旨在开展以下四方面工作：(a) 研发创新反演算法与处理器，以从哥白尼大气任务Sentinel-5 Precursor、Sentinel-4及Sentinel-5中生成增值产品；(b) 构建基于云的（重）处理系统；(c) 改进面向用户的数据发现与访问技术，以及服务端分析工具；(d) 提供数据可视化服务。