Abstract. The EarthCARE satellite mission’s objective is to retrieve profiles of aerosol and water cloud physical properties from measurements made by its cloud-profiling radar, backscattering lidar, and passive multi-spectral spectral imager (MSI). These retrievals, together with other geophysical properties, are input into broadband (BB) radiative transfer (RT) models that predict radiances, and fluxes, commensurate with measurements made, and inferred from, EarthCARE’s BB radiometer (BBR). The scientific goal is that modelled and “observed” BB fluxes differ, on average, by less than ±10 W m^-2. When sound synergistic retrievals from the ACM-CAP process are available, they are acted on by the RT models. When they are not available, the RT models act on “composite” atmospheric profiles of retrievals from individual sensors. “Compositing” is performed in the ACM-COM process as described in this report. The majority of this report describes the RT models, and their products, that make-up Earth-CARE’s ACM-RT process. Shortwave (SW) and longwave (LW) flux and heating rate (HR) profiles are computed by 1D RT models for each ~1 km nadir column of inferred properties. 3D RT models compute radiances for the BBR’s three viewing directions, with the SW model also computing flux and HR profiles; the 3D LW model produces upwelling flux at just one level. All 3D RT products are averages over 5 x 21 km “assessment domains” that are constructed using MSI data. A subset of ACM-RT’s products is passed forward to the “radiative closure assess-ment” process that quantifies, for each assessment domain, the likelihood that EarthCARE’s goal has been achieved. As EarthCARE represents the first mission to make “operational” use of 3D RT models, emphasis in this report is placed on differences between 1D and 3D RT results. For upwelling SW flux at 20 km altitude, 1D and 3D values can be expected to differ by more than EarthCARE’s scientific goal of ±10 W m^-2 at least 50 % of the time.

中文翻译：

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EarthCARE 任务的宽带辐射量：ACM-COM 和 ACM-RT 产品

摘要。EarthCARE 卫星任务的目标是通过其云剖面雷达、后向散射激光雷达和被动多光谱光谱成像仪 (MSI) 进行的测量来检索气溶胶和水云物理特性的剖面。这些检索与其他地球物理特性一起被输入宽带 (BB) 辐射传输 (RT) 模型，预测辐射和通量，与 EarthCARE 的 BB 辐射计 (BBR) 进行的测量和推断相称。科学目标是模型化和“观察到”的 BB 通量平均差异小于 ±10 W m ^-2. 当来自 ACM-CAP 过程的合理协同检索可用时，它们将由 RT 模型执行。当它们不可用时，RT 模型作用于从单个传感器检索的“复合”大气剖面。如本报告所述，“合成”在 ACM-COM 过程中执行。本报告的大部分内容描述了构成 Earth-CARE 的 ACM-RT 流程的 RT 模型及其产品。短波 (SW) 和长波 (LW) 通量和加热率 (HR) 剖面由 1D RT 模型计算，用于推断属性的每个 ~1 km 最低点列。3D RT 模型计算 BBR 三个观察方向的辐射，SW 模型还计算通量和 HR 分布；3D LW 模型仅在一个水平上产生上升流。所有 3D RT 产品都是使用 MSI 数据构建的 5 x 21 公里“评估域”的平均值。ACM-RT 产品的一个子集被传递到“辐射闭合评估”过程，该过程量化每个评估域实现 EarthCARE 目标的可能性。由于 EarthCARE 代表了第一个“可操作”使用 3D RT 模型的任务，因此本报告的重点放在 1D 和 3D RT 结果之间的差异上。对于 20 公里高度的上升流 SW 通量，1D 和 3D 值的差异预计会超过 EarthCARE 的科学目标 ±10 W m 由于 EarthCARE 代表了第一个“可操作”使用 3D RT 模型的任务，因此本报告的重点放在 1D 和 3D RT 结果之间的差异上。对于 20 公里高度的上升流 SW 通量，1D 和 3D 值的差异预计会超过 EarthCARE 的科学目标 ±10 W m 由于 EarthCARE 代表了第一个“可操作”使用 3D RT 模型的任务，因此本报告的重点放在 1D 和 3D RT 结果之间的差异上。对于 20 公里高度的上升流 SW 通量，1D 和 3D 值的差异预计会超过 EarthCARE 的科学目标 ±10 W m^-2至少 50% 的时间。