WP-2000 Calibration of EDA spread and adaptation of the observation error model
Title | WP-2000 Calibration of EDA spread and adaptation of the observation error model
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Report
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Date Published |
02/2022
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Series/Collection |
ESA Contract Report
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Author | |
Abstract | In this second phase of this project to investigate potential future constellations of small satellites carrying microwave (MW) sounding instruments, there are two subjects that have been explored. In the first part of this report, real MW data have been used to establish links between the observation impact using the Ensemble of Data Assimilations (EDA) method, described in the initial consolidation phase, and in Observing System Experiments (OSEs). Reductions in the EDA spread, which indicate a positive impact from the MW data, were compared with reductions in the standard deviation of forecast error. The forecast error has been evaluated by comparing the short-range forecast to a reference firstly provided by analyses from the operational system and secondly by radiosonde observations, taking into account the observation error. There is overall good qualitative similarity between EDA spread and both measures of the forecast error. Better agreement of the observation impact is found in the lower/mid-troposphere with possible under-estimation of the impact using the EDA spread in the stratosphere. While it is not useful to derive a quantitative relationship here, the results show that the EDA method provides a basis to investigate the relative impacts from the future simulated small satellite data and with the addition of reference points from the use of existing MW data. |
URL | https://www.ecmwf.int/en/elibrary/81289-wp-2000-calibration-eda-spread-and-adaptation-observation-error-model |
DOI | 10.21957/1auh0nztg |
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