Articles | Volume 18, issue 21
https://doi.org/10.5194/amt-18-6167-2025
https://doi.org/10.5194/amt-18-6167-2025
Research article
 | 
04 Nov 2025
Research article |  | 04 Nov 2025

Impact Study of Increased Radio Occultation Observations during the ROMEX Period Using JEDI and the GFS Atmospheric Model

Hailing Zhang, Hui Shao, Benjamin Ruston, and John J. Braun

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This preprint is open for discussion and under review for Geoscientific Model Development (GMD).
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Cited articles

Anthes, R., Sjoberg, J., Starr, J., and Zeng, Z.: Evaluation of biases and uncertainties in ROMEX radio occultation observations, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-2089, 2025. 
Anthes, R. A., Marquardt, C., Ruston, B., and Shao, H.: Radio Occultation Modeling Experiment (ROMEX): Determining the impact of radio occultation observations on numerical weather prediction, Bull. Amer. Meteor. Soc., 105, 1552–1568, https://doi.org/10.1175/BAMS-D-23-0326.1, 2024. 
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. 
Bauer, P., Radnóti, G., Healy, S., and Cardinali, C.: GNSS Radio Occultation Constellation Observing System Experiments, Mon. Wea. Rev., 142, 555–572, https://doi.org/10.1175/MWR-D-13-00130.1, 2014. 
Bormann, N.: Observation errors, https://www.ecmwf.int/sites/default/files/ObsErrors_2015_v2.pdf (last access: 19 September 2025), 2015. 
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Short summary
This study investigates the impact of increased Global Navigation Satellite System radio occultation (GNSS-RO) profiles on numerical weather prediction (NWP) as part of the Radio Occultation Modeling EXperiment (ROMEX) effort. Using the Joint Effort for Data assimilation Integration (JEDI), this impact study provides critical insights into the necessity of enhanced GNSS-RO observations for NWP applications.
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