Search Results - "Healy, S. B."

Assimilation of Global Positioning System radio occultation data in the ECMWF ERA–Interim reanalysis by Poli, P., Healy, S. B., Dee, D. P.

“…This article presents results of the assimilation of Global Positioning System (GPS) radio occultation (RO) bending‐angle data from CHAMP, FORMOSAT‐3/COSMIC…”
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Monthly and zonally averaged zonal wind information in the equatorial stratosphere provided by GNSS radio occultation by Healy, S. B., Polichtchouk, I., Horányi, A.

“…It is demonstrated that a realistic quasi‐biennial oscillation (QBO) of the zonally averaged zonal winds in the tropical stratosphere can be retrieved from a…”
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Surface pressure information retrieved from GPS radio occultation measurements by Healy, S. B.

“…Numerical weather prediction (NWP) experiments have been performed to investigate the impact of surface pressure information retrieved from Global Positioning…”
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A modification to the standard ionospheric correction method used in GPS radio occultation by Healy, S. B, Culverwell, I. D

“…A modification to the standard bending-angle correction used in GPS radio occultation (GPS-RO) is proposed. The modified approach should reduce systematic…”
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Assimilation experiments with CHAMP GPS radio occultation measurements by Healy, S. B., Thépaut, J.‐N.

“…A one‐dimensional bending‐angle observation operator for assimilating GPS radio occultation (RO) measurements has been integrated into the ECMWF…”
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A simulation study with a new residual ionospheric error model for GPS radio occultation climatologies by Danzer, J, Healy, S. B, Culverwell, I. D

“…In this study, a new model was explored which corrects for higher order ionospheric residuals in Global Positioning System (GPS) radio occultation (RO) data…”
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THE COSMIC/FORMOSAT-3 MISSION: Early Results by 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., Zeng, Z.

“…The radio occultation (RO) technique, which makes use of radio signals transmitted by the global positioning system (GPS) satellites, has emerged as a powerful…”
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Sensitivity Analysis and Impact of the Kappa‐Correction of Residual Ionospheric Biases on Radio Occultation Climatologies by Danzer, J., Schwaerz, M., Kirchengast, G., Healy, S. B.

“…A new model was recently introduced to correct for higher‐order ionospheric residual biases in radio occultation (RO) data. The model depends on the α1 and α2…”
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Forecast impact experiment with GPS radio occultation measurements by Healy, S. B., Jupp, A. M., Marquardt, C.

“…Refractivity profiles from CHAMP GPS radio occultation measurements have been assimilated into the Met Office numerical weather prediction (NWP) system. A…”
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Forecast impact studies of zenith total delay data from European near real-time GPS stations in Météo France 4DVAR by Poli, P., Moll, P., Rabier, F., Desroziers, G., Chapnik, B., Berre, L., Healy, S. B., Andersson, E., El Guelai, F.-Z.

“…Several networks of Global Positioning System receiving stations over Europe send their data to several processing centers to generate atmospheric Zenith Total…”
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A simplified approach for generating GNSS radio occultation refractivity climatologies by Gleisner, H, Healy, S. B

“…The possibility of simplifying the retrieval scheme required to produce GNSS radio occultation refractivity climatologies is investigated. In a new, simplified…”
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CHAMP climate data based on the inversion of monthly average bending angles by Danzer, J, Gleisner, H, Healy, S. B

“…Global Navigation Satellite System Radio Occultation (GNSS-RO) refractivity climatologies for the stratosphere can be obtained from the Abel inversion of…”
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Improving the bias characteristics of the ROPP refractivity and bending angle operators by Burrows, C. P, Healy, S. B, Culverwell, I. D

“…The bending angle observation operator (forward model) currently used to assimilate radio occultation (RO) data at the Met Office, the European Centre for…”
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Preliminary assessment of the scalability of GPS radio occultations impact in numerical weather prediction by Poli, P., Healy, S. B., Rabier, F., Pailleux, J.

“…This work evaluates the scalability of the impact of the GPS radio occultation (GPSRO) measurements on the reduction of Numerical Weather Prediction forecast…”
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The use of principal component analysis for the assimilation of high‐resolution infrared sounder observations for numerical weather prediction by Collard, A. D., McNally, A. P., Hilton, F. I., Healy, S. B., Atkinson, N. C.

“…Methodologies are discussed for the efficient representation of observations from high‐resolution infrared sounders for the purposes of assimilation into…”
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Radio occultation bending angle and impact parameter errors caused by horizontal refractive index gradients in the troposphere: A simulation study by Healy, S. B.

“…Radio occultation (RO) bending angle and impact parameter values are derived from a Doppler shift measurement, assuming spherical symmetry. The purpose of this…”
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Assimilating GPS radio occultation measurements with two‐dimensional bending angle observation operators by Healy, S. B., Eyre, J. R., Hamrud, M., Thépaut, J.‐N.

“…Four‐dimensional variational (4D‐Var) assimilation forecast impact experiments were conducted with CHAMP radio occultation measurements from 1st June to 31st…”
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Assimilation of satellite data in numerical weather prediction. Part II: Recent years by Eyre, J. R., Bell, W., Cotton, J., English, S. J., Forsythe, M., Healy, S. B., Pavelin, E. G.

“…Developments in the assimilation of satellite data in numerical weather prediction (NWP), from the first experiments in the late 1960s to the present day, are…”
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A nonlinear optimal estimation inverse method for radio occultation measurements of temperature, humidity, and surface pressure by Palmer, Paul I., Barnett, J. J., Eyre, J. R., Healy, S. B.

“…An optimal estimation inverse method is presented which can be used to retrieve simultaneously vertical profiles of temperature and specific humidity, in…”
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Refractivity coefficients used in the assimilation of GPS radio occultation measurements by Healy, S. B.

“…The sensitivity of European Centre for Medium‐Range Weather Forecasts (ECMWF) numerical weather prediction analyses to the empirical refractivity coefficients…”
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