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Solar-induced chlorophyll fluorescence from the Geostationary Carbon Cycle Observatory (GeoCarb): An extensive simulation study
Remote Sensing of Environment ( IF 11.1 ) Pub Date : 2021-06-24 , DOI: 10.1016/j.rse.2021.112565
Peter Somkuti , Christopher W. O'Dell , Sean Crowell , Philipp Köhler , Gregory R. McGarragh , Heather Q. Cronk , Eric B. Burgh

The Geostationary Carbon Cycle Observatory (GeoCarb), to be launched in 2023, will be capable of measuring solar-induced chlorophyll fluorescence (SIF) and add to the current space-based record which started in 1995. GeoCarb will be unique as it will be the first geostationary satellite capable of sensing SIF over the American continents. Consequently, SIF measurements from GeoCarb can be performed much more flexibly compared to polar-orbiting platforms. With its scan mirror assembly, the instrument can point to any location on the Earth disc. This will allow measurements to be collected at various times of day, and measurement locations can be re-visited several times within a day. In expectation of the launch, we conduct an extensive, SIF-focused simulation study and explore the capability and limitations of the instrument and its particular sampling approach. Using cloud information from real measurements, as well as other observation- and model-based data, we produce over four million atmospheric simulations of GeoCarb measurements that the instrument would see throughout a full day. We then apply dedicated SIF retrieval algorithms on the simulated spectra and investigate the results along with cloud-screening performance and emergent retrieval biases and subsequent bias correction. Finally, we make comparisons with currently operating instruments where appropriate and show future science users of GeoCarb SIF what a typical day of measurements will yield.



中文翻译:

地球静止碳循环观测站 (GeoCarb) 的太阳诱导叶绿素荧光:一项广泛的模拟研究

地球静止碳循环观测站 (GeoCarb) 将于 2023 年发射,将能够测量太阳诱导的叶绿素荧光 (SIF),并增加了从 1995 年开始的当前空间记录。 GeoCarb 将是独一无二的第一颗能够感知美洲大陆上空 SIF 的地球静止卫星。因此,与极轨平台相比,GeoCarb 的 SIF 测量可以更灵活地执行。借助其扫描镜组件,该仪器可以指向地球圆盘上的任何位置。这将允许在一天中的不同时间收集测量值,并且可以在一天内多次访问测量位置。为了期待发布,我们进行了广泛的,以 SIF 为重点的模拟研究和探索仪器及其特定采样方法的能力和局限性。使用来自实际测量的云信息以及其他基于观测和模型的数据,我们生成了超过 400 万个 GeoCarb 测量的大气模拟,仪器将在一整天内看到这些模拟。然后,我们在模拟光谱上应用专用的 SIF 检索算法,并研究结果以及云筛选性能和紧急检索偏差以及随后的偏差校正。最后,我们在适当的情况下与当前运行的仪器进行比较,并向 GeoCarb SIF 的未来科学用户展示典型的一天测量结果。我们生成了超过 400 万个 GeoCarb 测量的大气模拟,该仪器将在一整天内看到这些模拟。然后,我们在模拟光谱上应用专用的 SIF 检索算法,并研究结果以及云筛选性能和紧急检索偏差以及随后的偏差校正。最后,我们在适当的情况下与当前运行的仪器进行比较,并向 GeoCarb SIF 的未来科学用户展示典型的一天测量结果。我们生成了超过 400 万个 GeoCarb 测量的大气模拟,该仪器将在一整天内看到这些模拟。然后,我们在模拟光谱上应用专用的 SIF 检索算法,并研究结果以及云筛选性能和紧急检索偏差以及随后的偏差校正。最后,我们在适当的情况下与当前运行的仪器进行比较,并向 GeoCarb SIF 的未来科学用户展示典型的一天测量结果。

更新日期:2021-06-24
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