Abstract. The advanced baseline imager (ABI) onboard Geostationary Operational Environmental Satellites-16 (GOES-16) provides high-quality visible and near-infrared (VNIR) imagery data. Radiometric performance of the GOES-16 ABI multiple VNIR bands (B1, B2, B3, B5, and B6) is evaluated over the Sonoran Desert by comparing measurements with Suomi National Polar-Orbiting Partnership (S-NPP) and NOAA-20 visible infrared imaging radiometer suite equivalent bands M3, M5, M7, M10, and M11, respectively. In order to minimize the uncertainties due to the difference in spectral response functions of similar bands from the different sensors, spectral band adjustment factor (SBAF) derived from Hyperion data over Sonoran Desert is used. The large viewing angle at the Sonoran Desert by ABI (56.34 deg) and a lack of comprehensive BRDF model at such viewing geometry are the main challenges for the comparison. Two schemes to address such challenges were developed. A data-derived (DD) method, based on confining the matched solar-zenith angle and view-zenith angle between ABI and VIIRS, interpolation in solar-zenithal and relative-azimuthal angles is developed to address this issue. It is shown that there is some residual bias for ABI B1 and its equivalent VIIRS M3 band, which is mainly due to unaccounted angular dependence of atmospheric scattering in this DD method. To address this issue, a radiative transfer modeling (RTM)-based method to account for atmospheric effects is developed to facilitate the comparison. The time series trending and mean bias of reflectance ratio between ABI and VIIRS measurements over the Sonoran Desert after SBAF and bidirectional reflectance distribution function corrections are derived to evaluate the radiometric performance of ABI with respect to net primary productivity and NOAA-20 VIIRS. The analysis shows that the radiometric biases of the five VNIR channels of GOES-16 ABI are all within 5% in comparison to the matched channels of NPP VIIRS after applying the RTM correction. The analysis also detects ∼6 % drop in the radiometric bias of GOES-16 ABI 0.64 μm channel after April 23, 2019, which can be traced to the implementation of a correction of the ABI B2 calibration coefficient around this date. Further, we evaluate the relative radiometric bias for the five VNIR channels between NPP and NOAA-20 VIIIRS using double difference method, and the comparison shows that NPP VIIRS has 2% to 3% higher bias than NOAA-20 VIIRS for these spectral bands.

中文翻译：

---

在索诺兰沙漠上使用 NPP 和 NOAA-20 VIIRS 验证 GOES-16 ABI VNIR 通道辐射性能

摘要。地球同步运行环境卫星 16 (GOES-16) 上的高级基线成像仪 (ABI) 提供高质量的可见光和近红外 (VNIR) 图像数据。GOES-16 ABI 多个 VNIR 波段（B1、B2、B3、B5 和 B6）在索诺兰沙漠上的辐射性能通过与 Suomi 国家极地轨道伙伴关系 (S-NPP) 和 NOAA-20 可见红外的测量值进行比较来评估成像辐射计套件等效频段分别为 M3、M5、M7、M10 和 M11。为了最大限度地减少由于来自不同传感器的相似波段的光谱响应函数的差异而导致的不确定性，使用了从索诺兰沙漠上的 Hyperion 数据导出的光谱波段调整因子（SBAF）。ABI 在索诺兰沙漠的大视角 (56. 34 度）和缺乏这种观察几何的综合 BRDF 模型是比较的主要挑战。制定了两个计划来应对这些挑战。一种数据衍生 (DD) 方法，基于限制 ABI 和 VIIRS 之间匹配的太阳天顶角和视角天顶角，开发了太阳天顶角和相对方位角的插值来解决这个问题。结果表明，ABI B1 及其等效的 VIIRS M3 波段存在一些残余偏差，这主要是由于这种 DD 方法中大气散射的角度依赖性未计入。为了解决这个问题，开发了一种基于辐射传输建模 (RTM) 的方法来解释大气效应，以促进比较。在 SBAF 和双向反射分布函数校正后，索诺兰沙漠 ABI 和 VIIRS 测量值之间的时间序列趋势和反射率平均偏差被推导出来，以评估 ABI 在净初级生产力和 NOAA-20 VIIRS 方面的辐射性能。分析表明，在应用RTM校正后，与NPP VIIRS的匹配通道相比，GOES-16 ABI的五个VNIR通道的辐射偏差均在5%以内。该分析还检测到 2019 年 4 月 23 日之后 GOES-16 ABI 0.64 μm 通道的辐射测量偏差下降了约 6%，这可以追溯到在该日期前后对 ABI B2 校准系数进行校正的实施。更多，