Articles | Volume 19, issue 16
https://doi.org/10.5194/amt-19-5509-2026
https://doi.org/10.5194/amt-19-5509-2026
Research article
 | 
27 Aug 2026
Research article |  | 27 Aug 2026

Impact of ROMEX Radio Occultation bending angle assimilation on mesoscale weather prediction over the Indian Region

Randhir Singh, Satya P. Ojha, Kudilil Faisal Muhammed, and Richard Anthes

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Evaluation of biases and uncertainties in ROMEX radio occultation observations
Richard Anthes, Jeremiah Sjoberg, Jon Starr, and Zhen Zeng
Atmos. Meas. Tech., 18, 6997–7019, https://doi.org/10.5194/amt-18-6997-2025,https://doi.org/10.5194/amt-18-6997-2025, 2025
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Cited articles

Anthes, R. A., Rocken, C., and Kuo, Y.-H.: Applications of COSMIC to meteorology and climate, Terr. Atmos. Ocean. Sci., 11, 115–156, https://doi.org/10.3319/TAO.2000.11.1.115(COSMIC), 2000. a
Anthes, R. A., Bernhardt, P. A., Chen, Y., Cucurull, L., Dymond, K. F., Ector, D., Healy, S. B., Ho, S.-P., Hunt, D. C., Kuo, Y.-H., Liu, H., Manning, K., McCormick, C., Meehan, T. K., Randel, W. J., Rocken, C., Schreiner, W. S., Sokolovskiy, S. V., Syndergaard, S., Thompson, D. C., Trenberth, K. E., Wee, T.-K., Yen, N. L., and Zeng, Z.: The COSMIC/FORMOSAT-3 mission: Early results, Bull. Am. Meteorol. Soc., 89, 313–334, https://doi.org/10.1175/BAMS-89-3-313, 2008. a, b
Anthes, R. A., Marquardt, C., Ruston, B., and Shao, H.: Radio Occultation Modelling Experiment (ROMEX) – Determining the impact of radio occultation observations on numerical weather prediction, Bull. Am. Meteorol. Soc., 105, https://doi.org/10.1175/BAMS-D-23-0326.1, 2024. a, b, c
Anthes, R., Sjoberg, J., Starr, J., and Zeng, Z.: Evaluation of biases and uncertainties in ROMEX radio occultation observations, Atmos. Meas. Tech., 18, 6997–7019, https://doi.org/10.5194/amt-18-6997-2025, 2025. a
Aparicio, J. M. and Deblonde, G.: Signature of the atmospheric compressibility factor in COSMIC, CHAMP, and GRACE radio occultation data, J. Geophys. Res.-Atmos., 114, D16114, https://doi.org/10.1029/2008JD011156, 2009. a
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Short summary
This study investigated whether short-range weather forecasting over India could be improved by incorporating GNSS (Global Navigation Satellite System) radio occultation (RO) data from ROMEX (Radio Occultation Modelling Experiment). Data assimilation experiments using the WRF (Weather Research and Forecasting) model were conducted for September 2022. The findings demonstrate how GNSS-RO measurements improved predictions for temperature, humidity, wind, and precipitation. The biggest gains came from better initial water vapour fields, which reduced forecast error and improved rainfall skill.
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