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NRT Notification Detail
| Provision of GNSS-RO bending angle uncertainty estimates |
| DATE: 2023-03-22 16:10 TYPE: DATA |
| Description |
| Dear ROM SAF Data User Issued: 2023-03-22 16:10 UTC The ROM SAF now provides monthly estimates of the bending angle uncertainty for Metop/GRAS, COSMIC-2 and Spire GNSS-RO measurements. This information can be viewed on the ROM SAF monitoring pages via: https://www.ecmwf.int/en/forecasts/quality-our-forecasts/monitoring/gpsro-monitoring, where we show both standard deviation of the bending angle errors and the bending angle error correlations matrices (see, e.g., Figs. 1 and 2 here: https://www.romsaf.org/previous_news.php#March22-23_181). In addition, the data and python routines used to generate these figures can be downloaded from the ROM SAF webpage at: https://www.romsaf.org/pub/demo/RO_error_stats. We hope this information will be useful for colleagues outside the ROM SAF, who are working on the assimilation of GNSS-RO measurements. These error statistic estimates will be updated each month. At the moment, the statistics are only split into all data and rising/setting observations, but the plan is to add splitting by GNSS type (GPS, Galileo, etc) later in 2023. Note that recent work in this area by the ROM SAF and colleagues NASA and UCAR can be found here: Todling, R, Semane, N, Anthes, R and S Healy (2022). The Relationship Between Two Methods for Estimating Uncertainties in Data Assimilation, Quarterly Journal of the Royal Meteorological Society, available from: https://doi.org/10.1002/qj.4343 Kind regards The ROM SAF Team |
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