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首页> 外文期刊>Quarterly Journal of the Royal Meteorological Society >Observing-system impact assessment using a data assimilation ensemble technique: application to the ADM-Aeolus wind profiling mission
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Observing-system impact assessment using a data assimilation ensemble technique: application to the ADM-Aeolus wind profiling mission

机译：使用数据同化集成技术的观测系统影响评估：在ADM-Aeolus风廓线任务中的应用

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摘要

Ensembles of parallel 4D-Var data assimilation cycles have been used to assess the impact of two observing systems: the existing network of radiosonde and wind profilers, and the future spaceborne ADM-Aeolus wind-profiling LIDAR. We demonstrate that this new technique for impact assessment provides a practical alternative to the traditional observing system simulation experiments (OSSEs), with the particular advantage that real existing observations are assimilated exactly as in operational practice,and do not need to be simulated artificially. It is only the future observing system under test (ADM-Aeolus in our case) that is generated through simulation. Furthermore, in contrast with OSSEs, there is no need to generate an artificial reference atmosphere ('proxy truth' or 'nature run'), and the problems normally associated with identical-twin experiments are thus avoided. Our results, based on detailed simulation of the ADM-Aeolus wind-measuring capabilities and expected data quality, show that ADM-Aeolus will provide benefits comparable to the radiosonde and wind-profiler network, with analysis impact particularly over ocean and in the tropics. The impact is retained up to the medium range of forecast (around day 5). Our results for radiosonde and wind-profiler impact agree qualitatively with those obtained with the well-established observing system experiment (OSE) technique; this agreement gives some confidence in the usefulness of the ensemble-based technique for impact assessment.
机译：并行的4D-Var数据同化周期集合体已用于评估两个观测系统的影响：现有的无线电探空仪和风廓线仪网络以及未来的星载ADM-Aeolus风廓线LIDAR。我们证明了这种用于影响评估的新技术为传统的观测系统模拟实验（OSSE）提供了一种实用的替代方法，其特别优势是可以将真实的现有观测值完全与操作实践中的相同，并且无需人工模拟。通过模拟生成的只是将来的被测观测系统（在我们的情况下为ADM-Aeolus）。此外，与OSSE相比，不需要生成人工参考环境（“代理真相”或“自然运行”），因此避免了通常与同卵双胞胎实验相关的问题。我们的结果基于对ADM-Aeolus测风能力和预期数据质量的详细模拟，表明ADM-Aeolus将提供与无线电探空仪和风廓线仪网络相当的优势，尤其是在海洋和热带地区，分析影响尤为明显。影响会一直保留到预测的中等范围（第5天左右）。我们对无线电探空仪和风廓线仪影响的结果与通过完善的观测系统实验（OSE）技术获得的结果在质量上相符;该协议使人们对基于整体的技术对影响评估的实用性充满信心。

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