Aparicio, J.: Impact of ROMEX refractivity profiles at half and full density in Environment Canada's deterministic system, The Second ROMEX Workshop, EUMETSAT Headquarters, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/81b5021f-a223-453e-870c-018dfcf5efdc/10_20250225_apariciojosep_eccc_romex.pdf, last access: 19 September 2025.
Bowler, N. E.: An assessment of GNSS radio occultation data produced by Spire, Q. J. Roy. Meteor. Soc., 146, 3772–3788, https://doi.org/10.1002/qj.3872, 2020.
Bowler, N. E. and Lewis, O.: Understanding the impact of additional observations in the Met Office system, The Second ROMEX Workshop, EUMETSAT Headquarters, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/25c71745-2c8d-488b-be58-02f274ecd1c0/7_20250225_neillbowler_metoffice_romex.pdf, last access: 19 September 2025.
Buontempo, C., Jupp, A., and Rennie, M.: Operational NWP assimilation of GPS radio occultation data, Atmos. Sci. Lett., 9, 129–133, https://doi.org/10.1002/asl.173, 2008.
Burrows, C. P., Healy, S. B., and Culverwell, I. D.: Improving the bias characteristics of the ROPP refractivity and bending angle operators, Atmos. Meas. Tech., 7, 3445–3458, https://doi.org/10.5194/amt-7-3445-2014, 2014.
Cheng, Y.: Improvement of Yunyao RO data quality and development of YunYao constellations. The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/06d73675-ac8a-4c20-8c20-ec976358ccd7/3_the_improvement_of_yunyao_ro_data_quality_and_development_of_yunyao_constellations-chengyan.pdf, last access: 19 September 2025.
Christophersen, H. and Ruston, B.: Impact of ROMEX in the U. S. Navy's Global Numerical System. The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/97b7e129-5968-4b6c-8c4a-9869ce13d83c/12_20250225_huichristophersen_nrl_romex.pdf, last access: 19 September 2025.
Cucurull, L.: Recent Impact of COSMIC-2 with Improved Radio Occultation Data Assimilation Algorithms, Wea. Forecast, 38, 1829–1847, https://doi.org/10.1175/WAF-D-22-0186.1, 2023.
Cucurull, L., Derber, J. C., Treadon, R., and Purser, R. J.: Assimilation of Global Positioning System radio occultation observations into NCEP's Global Data Assimilation System, Mon. Wea. Rev., 135, 3174–3193, 2007.
Harnisch, F., Healy, S., Bauer, P., and English, S.: Scaling of GNSS radio occultation impact with observation number using an ensemble of data assimilations, Mon. Wea. Rev., 141, 4395–4413, https://doi.org/10.1175/MWR-D-13-00098.1, 2013.
Healy, S.: Implementation of the ROPP two-dimensional bending angle observation operator in an NWP system, ROM SAF Rep. 19, 33 pp.,
http://www.romsaf.org/general-documents/rsr/rsr_19.pdf (last access: 10 March 2025), 2014.
Healy, S. B., Eyre, J. R., Hamrud, M., and Thépaut, J. N.: Assimilating GPS radio occultation measurements with two-dimensional bending angle observation operators, Q. J. Roy. Meteor. Soc., 133, 1213–1227, https://doi.org/10.1002/qj.63, 2007.
JCSDA: jedi-bundle: Bundle containing all the repositories needed to compile JEDI for use in Skylab, GitHub [code],
https://github.com/JCSDA/jedi-bundle (last access: 29 October 2025), 2025.
Kursinski, E. R.: PlanetiQ status and plans, The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/44ea07c8-4191-4719-ad18-fb08f762f927/4_20250227_robkursinski_planetiq_romex.pdf, last access: 19 September 2025.
Kursinski, E. R., Hajj, G. A., Schofield, J. T., Linfield, R. P., and Hardy, K. R.: Observing Earth's atmosphere with radio occultation measurements using the global positioning system, J. Geophys. Res., 102, 23429–23465, https://doi.org/10.1029/97JD01569, 1997.
Liao, M.: Current and future mission of Fengyun radio occultation, The First ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 17–19 April 2024,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/61/6639f209-073a-4810-be45-3674705a9e7f/20240417_5_miliao_gnos_status_-_v1_romex.pdf (last access: 19 September 2025), 2024.
Lin, S.: A “Vertically Lagrangian” Finite-Volume Dynamical Core for Global Models, Mon. Wea. Rev., 132, 2293–2307, https://doi.org/10.1175/1520-0493(2004)132<2293:AVLFDC>2.0.CO;2, 2004.
Lonitz, K.: Sensitivity to the RO observation operator when assimilating 35 000 radio occultations per day during ROMEX, The 2024 COSMIC/JCSDA Workshop and IROWG-10, Boulder, Colorado, USA, 12–18 September 2024,
https://www.cosmic.ucar.edu/sites/default/files/2024-09/1%20-%20Lonitz_Katrin_2024.09.16.pptx.pdf (last access: 19 September 2025), 2024.
Lonitz, K.: Updates on running ROMEX experiments at ECMWF, The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/9326ec50-ce3e-47b8-b714-24bafb99d8d8/6_new_20250225_katrinlonitz_ecmwf_romex.pdf, 2025.
Lonitz, K., Marquardt, C., Bowler, N., and Healy, S.: Final technical note of “impact assessment of commercial GNSS-RO data”, ECMWF Tech. Rep. 4000131086/20/NL/FF/a, 74 pp., https://doi.org/10.21957/wrh6voyyi, 2021.
Marquardt, C.: ROMEX data processing, The First ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 17–19 April 2024,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/61/565d7153-abac-414f-92dc-5466867616fc/20240417_13_marquardt_et_al_eumetsat_romex.pdf (last access: 19 September 2025), 2024.
Meixner, J., Thomas, C., Han, J., Manikin, G., Chuang, H.-Y., Mahajan, R., Wang, J., Barton, N., Benjamin, A., Bentley, A., Chen, L. G., Mao, Y., Meng, W., Montuoro, R., Stefanova, L., Vernieres, G., Wang, J., and Zhu, Y.: Overview of the Next Global Forecast System GFSv17, Unified Forecast System Community Workshop, Boulder, CO, 24–28 July 2023,
https://epic.noaa.gov/wp-content/uploads/2023/08/UIFCW-2023-Tue-2.-Meixner_UIFCW-_GFSv17Overview-_202307.pdf (last access: 10 March 2025), 2023.
Nguyen, V.: Spire RO data for ROMEX and Status Update, The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/63efe996-5bac-4bf1-9919-a982b4165bed/2_20250227_nguyen_vu_spire_romex.pdf (last access: 19 September 2025), 2025.
Privé, N. C., Errico, R. M., and Akkraoui, A. E.: Investigation of the Potential Saturation of Information from Global Navigation Satellite System Radio Occultation Observations with
an Observing System Simulation Experiment, Mon. Wea. Rev., 150, 1293–1316, https://doi.org/10.1175/MWR-D-21-0230.1, 2022.
Ruston, B. and Healy, S.: Forecast impact of FORMOSAT-7/COSMIC-2 GNSS radio occultation measurements, Atmos. Sci. Lett., 22, e1019, https://doi.org/10.1002/asl.1019, 2021.
Samrat, N. H., Candy, B., Lewis, O., Cotton, J., Smith, F., Halloran, G., Harlow, C., Lawrence, H., Migliorini, S., Smith, A., and Thomas, C.: Observation impact evaluation through data denial experiments in the Met Office global numerical weather prediction system, Q. J. R. Meteorol. Soc., e5002, https://doi.org/10.1002/qj.5002, 2025.
Shao, H., Foelsche, U., Mannucci, A., Azeem, I., Bowler, N., Braun, J., Lonitz, K., Marquardt, C., Steiner, A., Ruston, B., and Vergados, P.: Advances in GNSS-Based Remote Sensing for Weather, Climate, and Space Weather: Missions, Applications, and Emerging Techniques, Bull. Amer. Meteor. Soc., 106, E1471–E1477, https://doi.org/10.1175/BAMS-D-25-0138.1, 2025.
Stefanova, L., Meixner, J., Wang, J., Ray, S., Mehra, A., Barlage, M., Bengtsson, L., Bhattacharjee, P., Bleck, R., Chawla, A., Green, B., Han, J., Li, W., Li, X., Montuoro, R., Moorthi, S., Stan, C., Sun, S., Worthen, D., Yang, F., and Zheng, W.: Description and Results from UFS Coupled Prototypes for Future Global, Ensemble and Seasonal Forecasts at NCEP, Office note, National Centers for Environmental Prediction (U. S.), 510 pp., https://doi.org/10.25923/knxm-kz26, 2022.
Tang, Q.: Introduction to GNSS RO and GNSS-R products of Tianmu-1 Constellation, The Second ROMEX workshop, EUMETSAT headquarter, Darmstadt, Germany, 25–27 February 2025,
https://cdn.eventsforce.net/files/ef-xnn67yq56ylu/website/66/c42f0b73-de39-4f34-987c-01bd63625c0a/1_introduction_to_gnss-ro_and_gnss-r_products_of_tianmu-1_constellation-for_romex-20250227.pdf (last access: 19 September 2025), 2025.
Trémolet, Y. and Auligné, T.: The Joint Effort for Data Assimilation Integration (JEDI), JCSDA Quarterly Newsletter, 66, 1–5, https://doi.org/10.25923/RB19-0Q26, 2020.
Zhou, X., Zhu, Y., Hou, D., Fu, B., Li, W., Guan, H., Sinsky, E., Kolczynski, W., Xue, X., Luo, Y., Peng, J., Yang, B., Tallapragada, V., and Pegion, P.: The Development of the NCEP Global Ensemble Forecast System Version 12, Wea. Forecasting, 37, 1069–1084, https://doi.org/10.1175/WAF-D-21-0112.1, 2022.