Sentinel-5P TROPOMI – Cloud-Top Height (CTH), 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-Top Height (CTH) around the globe. Clouds play a crucial role in the Earth's climate system and have significant effects on trace gas retrievals. The cloud-top height 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.搭载于哥白尼哨兵-5前驱卫星（Copernicus Sentinel-5 Precursor）的对流层监测仪器（TROPOMI）是一台天底观测型成像光谱仪，可每日获取全球大气特性与组成成分的观测数据。该仪器为空气质量与气候监测提供支撑，并为相关服务机构及决策制定者提供关键数据支持。 该仪器采用被动遥感（passive remote sensing）技术，通过测量地球及其大气反射与辐射的大气层顶太阳辐射完成观测。TROPOMI搭载的四台光谱仪覆盖电磁光谱中的紫外线（UV）、可见光（VIS）、近红外（Near Infra-Red, NIR）以及短波红外（Short Wavelength Infra-Red, SWIR）波段。由德国宇航中心（DLR）代表欧洲空间局（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）、甲烷（CH4），以及云与气溶胶特性产品。 本产品展示全球范围内的云顶高度（Cloud-Top Height, CTH）。云在地球气候系统中发挥着至关重要的作用，同时对痕量气体反演产生显著影响。云顶高度通过ROCINN算法从氧-A波段反演得到。每日观测数据被归分到规则经纬网格中。 本产品是在INPULS项目框架下研发的。该项目旨在：(a) 研发针对哥白尼计划哨兵-5前驱卫星、哨兵-4号及哨兵-5号大气观测数据的创新性反演算法与处理器，以生成增值产品；(b) 构建基于云的（重）处理系统；(c) 开发面向用户的改进型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。