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Articles, Papers and Reports

This page contains journal articles, scientific papers, and reports written (or co-written) by ROM SAF team members.

Articles and papers

2024

Paz, A.; Padullés, R.; Cardellach, E. (2024). Evaluating the Polarimetric Radio Occultation Technique Using NEXRAD Weather Radars, Remote Sens., 16, 1118, doi:10.3390/rs16071118.
Leroy, S. S., McVey, A. E., Leidner, S. M., Zhang, H., & Gleisner, H. (2024). GNSS radio occultation data in the AWS cloud, Earth and Space Science, 11, e2023EA003021. doi: 10.1029/2023EA003021.
Elvidge, S., Healy, S. B., & Culverwell, I. D. (2024). One-dimensional variational ionospheric retrieval using radio occultation bending angles: 2. Validation. Space Weather, 22, e2023SW003571. doi:10.1029/2023SW003571.
Culverwell, I. D., Healy, S. B., & Elvidge, S. (2024). One-dimensional variational ionospheric retrieval using Radio Occultation bending angles: 1. Theory. Space Weather, 22, e2023SW003572. doi:10.1029/2023SW003572.

2023

Olivares-Pulido, G., Hernández-Pajares, M., Monte-Moreno, E., Lyu, H., Graffigna, V., Cardellach, E., Hoque, M., Prol, F.S., Notarpietro, R. and Garcia-Fernandez, M., 2023. Real-Time Tomographic Inversion of Truncated Ionospheric GNSS Radio Occultations. Remote Sensing, 15(12), p.3176, doi:10.3390/rs15123176.
Ladstädter, F., Steiner, A.K. & Gleisner, H. Resolving the 21st century temperature trends of the upper troposphere-ower stratosphere with satellite observations. Sci Rep 13, 1306 (2023). doi: 10.1038/s41598-023-28222-x.

2022

Syndergaard, S., and G. Kirchengast. 2022. Systematic Ionospheric Residual Errors in GNSS Radio Occultation: Theory for Spherically Stratified Media. Earth and Space Science 9 (10). doi:10.1029/2022EA002335.
Nielsen, J. K., Gleisner, H., Syndergaard, S., and Lauritsen, K. B.: Estimation of refractivity uncertainties and vertical error correlations in collocated radio occultations, radiosondes, and model forecasts, Atmos. Meas. Tech., 15, 6243-6256, doi:10.5194/amt-15-6243-2022, 2022.
Leroy, S. S., and Gleisner, H., 2022. The stratospheric diurnal cycle in COSMIC GPS radio occultation data: Scientific applications, Earth and Space Science 9, e2021EA002011, doi:10.1029/2021EA002011.
Semane, N., Anthes, R., Sjoberg, J., Healy, S., & Ruston, B. (2022). Comparison of Desroziers and Three-Cornered Hat Methods for Estimating COSMIC-2 Bending Angle Uncertainties, Journal of Atmospheric and Oceanic Technology, 39(7), 929-939. doi:10.1175/JTECH-D-21-0175.1, Retrieved Jul 7, 2022.
Gleisner, H., Ringer, M. A., & Healy, S. B. Monitoring global climate change using GNSS radio occultation, npj Clim Atmos Sci 5, 6 (2022). doi:10.1038/s41612-022-00229-7, 2022.

2021

Gorbunov, M., Kirchengast, G., and Lauritsen, K. B.: Generalized canonical transform method for radio occultation sounding with improved retrieval in the presence of horizontal gradients, Atmos. Meas. Tech., 14, 853-867, doi:10.5194/amt-14-853-2021, 2021.

2020

Liu, C., Kirchengast, G., Syndergaard, S., Schwaerz, M., Danzer, J., Sun, Y., New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value, Remote Sens., 12, 3637. doi:10.3390/rs12213637, 2020.
Steiner, A. K., Ladstädter F., Randel, W. J., Maycock, A. C., Fu, Q., Claud, C., Gleisner, H., Haimberger, L., Ho, S.-P., Keckhut, P., Leblanc, T., Mears,C., Polvani, L. M., Santer, B. D., Schmidt, T., Sofieva, V., Wing, R., Zou, C. -Z., 2020: Observed Temperature Changes in the Troposphere and Stratosphere from 1979 to 2018. J. Climate, 33, 8165-8194, doi:10.1175/JCLI-D-19-0998.1, 2020.
Healy, B, Polichtchouk, I., Horányi, A.. Monthly and zonally averaged zonal wind information in the equatorial stratosphere provided by GNSS radio occultation. Q J R Meteorol Soc.; 1- 10. doi:10.1002/qj.3870, 2020.
Danzer, J., Schwaerz, M., Kirchengast, G., & Healy, S. B. (2020). Sensitivity analysis and impact of the kappa-correction of residual ionospheric biases on radio occultation climatologies, Earth and Space Science, 7, e2019EA000942. doi:10.1029/2019EA000942, 2020.
Gleisner, H., Lauritsen, K. B., Nielsen, J. K., and Syndergaard, S., Evaluation of the 15-year ROM SAF monthly mean GPS radio occultation climate data record, Atmos. Meas. Tech., 13, 3081-3098, doi:10.5194/amt-13-3081-2020, 2020.
Steiner, A. K., Ladstädter, F., Ao, C. O., Gleisner, H., Ho, S.-P., Hunt, D., Schmidt, T., Foelsche, U., Kirchengast, G., Kuo, Y.-H., Lauritsen, K. B., Mannucci, A. J., Nielsen, J. K., Schreiner, W., Schwärz, M., Sokolovskiy, S., Syndergaard, S., and Wickert, J., Consistency and structural uncertainty of multi-mission GPS radio occultation records, Atmos. Meas. Tech., 13, 2547-2575, doi:10.5194/amt-13-2547-2020, 2020.

2019

Lyu, H., Hernández-Pajares, M., Monte-Moreno, E., & Cardellach, E. (2019). Electron density retrieval from truncated radio occultation GNSS data. Journal of Geophysical Research: Space Physics, 124, 4842-4851. doi:10.1029/2019JA026744, 2019.
Li, Y., Kirchengast, G., Scherllin-Pirscher, B., Schwaerz, M., Nielsen, J.K., Ho, S.-P., Yuan, Y.-B, A New Algorithm for the Retrieval of Atmospheric Profiles from GNSS Radio Occultation Data in Moist Air and Comparison to 1DVar Retrievals, Remote Sens., 11, 2729, doi:10.3390/rs11232729, 2019.
Liao, M., Healy, S., and Zhang, P., Processing and quality control of FY-3C GNOS data used in numerical weather prediction applications, Atmos. Meas. Tech., 12, 2679-2692, doi:10.5194/amt-12-2679-2019, 2019.

2018

J. Danzer, M. Schwärz, V. Proschek, U. Foelsche and H. Gleisner, Comparison study of COSMIC RO dry-air climatologies based on average profile inversion, Atmos. Meas. Tech., 11, 4867-4882, doi:10.5194/amt-11-4867-2018, 2018.
R. Padullés, E. Cardellach, K.-N. Wang, C. O. Ao, F. J. Turk and M. de la Torre-Juárez, Assessment of global navigation satellite system (GNSS) radio occultation refractivity under heavy precipitation, Atmos. Chem. Phys., 18, 11697-11708, doi:10.5194/acp-18-11697-2018, 2018.
J. M. Aparicio, E. Cardellach, and H. Rodríguez., Information content in reflected signals during GPS Radio Occultation observations, Atmos. Meas. Tech., 11, 1883-1900, doi:10.5194/amt-11-1883-2018, 2018.
Matthew J. Angling, Sean Elvidge, and Sean B. Healy, Improved model for correcting the ionospheric impact on bending angle in radio occultation measurements, Atmos. Meas. Tech., 11, 2213-2224, doi:10.5194/amt-11-2213-2018, 2018.
M. E. Gorbunov, E. Cardellach and K. B. Lauritsen, Reflected ray retrieval from radio occultation data using radio holographic filtering of wave fields in ray space, Atmos. Meas. Tech., 11, 1181-1191, doi:10.5194/amt-11-1181-2018, 2018.

2017

Khaykin, S. M., et al. (2017), Postmillennium changes in stratospheric temperature consistently resolved by GPS radio occultation and AMSU observations, Geophys. Res. Lett., 44, 7510-7518, doi:10.1002/2017GL074353, 2017
E. Cardellach, R. Padullés, S. Tomás, F. J. Turk, C. O. Ao and M. de la Torre-Juárez, Probability of intense precipitation from polarimetric GNSS radio occultation observations, Q.J.R. Meteorol. Soc., doi:10.1002/qj.3161, 2017.
R. Padullés, E. Cardellach and A. Rius, Untangling rain structure from polarimetric GNSS Radio Occultation observables: a 2D tomographic approach, European Journal of Remote Sensing, 49:1, 571-585, doi:10.5721/EuJRS20164930, 2017.
Jordis S Tradowsky, Chris P Burrows, Sean B Healy and John Eyre, A New Method to Correct Radiosonde Temperature Biases Using Radio Occultation Data, J Appl. Meteorol and Clim., 56:6, 1643-1661, 2017.

2016

R. Padullés, E. Cardellach, M. de la Torre Juárez, S. Tomás, F. J. Turk, S. Oliveras, C. O. Ao, and A. Rius, Atmospheric polarimetric effects on GNSS radio occultations: the ROHP-PAZ field campaign, Atmos. Chem. Phys., 16, 635-649, doi:10.5194/acp-16-635-2016, 2016.

2015

M. E. Gorbunov, V. V. Vorob'ev, and K. B. Lauritsen, Fluctuations of refractivity as a systematic error source in radio occultations, Radio Sci., 50, 656-669, doi:10.1002/2014RS005639, 2015.
Culverwell, I. D., Lewis, H. W., Offiler, D., Marquardt, C., and Burrows, C. P., The Radio Occultation Processing Package, ROPP, Atmos. Meas. Tech., 8, 1887-1899, doi:10.5194/amt-8-1887-2015, 2015.
S. B. Healy and I. D. Culverwell, A modification to the ionospheric correction method used in GPS radio occultation, Atmos. Meas. Tech., 8, 3385-3393, doi:10.5194/amt-8-3385-2015, 2015.
J. Danzer, S. B. Healy, and I. D. Culverwell, A simulation study with a new residual ionospheric error model for GPS radio occultation climatologies, Atmos. Meas. Tech., 8, 3395-3404, doi:10.5194/amt-8-3395-2015, 2015.
H. Gleisner, P. Thejll, B. Christiansen and J. K. Nielsen, Recent global warming hiatus dominated by low latitude temperature trends in surface and troposphere data, Geophys. Res. Lett., 1944-8007, doi:10.1002/2014GL062596, 2015.
B. Scherllin-Pirscher, S. Syndergaard, U. Foelsche and K. B. Lauritsen, Generation of a bending angle radio occultation climatology (BAROCLIM) and its use in radio occultation retrievals, Atmos. Meas. Tech., 8, 109-124, doi:10.5194/amt-8-109-2015, 2015.

2014

C. Cardinali, S. B. Healy, Impact of GPS radio occultation measurements in the ECMWF system using adjoint-based diagnostics,Q.J.R. Meteorol. Soc., 140: 2315-2320, doi: 10.1002/qj.2300, 2014.
C. P. Burrows, S. B. Healy, and I. D. Culverwell, Improving the bias characteristics of the ROPP refractivity and bending angle operators, Atmos. Meas. Tech., 7, 3445-3458, doi:10.5194/amt-7-3445-2014, 2014.
J. Danzer, H. Gleisner, and S. B. Healy, CHAMP climate data based on the inversion of monthly average bending angles, Atmos. Meas. Tech., 7, 4071-4079, doi:10.5194/amt-7-4071-2014, 2014.

2013

H. Gleisner and S. B. Healy, A simplified approach for generating GNSS radio occultation refractivity climatologies, Atmos. Meas. Tech., 6, 121-129, doi: 10.5194/amt-6-121-2013, 2013.
A. K. Steiner, D. Hunt, S.-P. Ho, G. Kirchengast, A. J. Mannucci, B. Scherllin-Pirscher, H. Gleisner, A. von Engeln, T. Schmidt, C. Ao, S. S. Leroy, E. R. Kursinski, U. Foelsche, M. Gorbunov, S. Heise, Y.-H. Kuo, K. B. Lauritsen, C. Marquardt, C. Rocken, W. Schreiner, S. Sokolovskiy, S. Syndergaard, and J. Wickert, Quantification of Structural Uncertainty in Climate Data Records from GPS Radio Occultation, Atmos. Chem. Phys., 13, 1469-1484, doi: 10.5194/acp-13-1469-2013, 2013.
S. B. Healy, Surface Pressure Information Retrieved from GPS Radio Occultation Measurements, Q.J.R. Meteorol. Soc., doi: 10.1002/qj.2090, 2013.

2012

S.-P. Ho, D. Hunt, A. K. Steiner, A. J. Mannucci, G. Kirchengast, H. Gleisner, S. Heise, A. von Engeln, C. Marquardt, S. Sokolovskiy, W. Schreiner, B. Scherllin-Pirscher, C. Ao, J. Wickert, S. Syndergaard, K. B. Lauritsen, S. Leroy, E. R. Kursinski, Y.-H. Kuo, U. Foelsche, T. Schmidt, and M. Gorbunov, Reproducibility of GPS radio occultation data for climate monitoring: Profile-to-profile inter-comparison of CHAMP climate records 2002 to 2008 from six data centers, Journal of Geophysical Research, Vol. 117, D18111, doi: 10.1029/2012JD017665, 2012.

2011

U. Foelsche, S. Syndergaard, J. Fritzer, and G. Kirchengast, Errors in GNSS radio occultation data: relevance of the measurement geometry and obliquity of profiles, Atmos. Meas. Tech., 4, 189-199, doi: 10.5194/amt-4-189-2011, 2011.
M. E. Gorbunov, Lauritsen, K. B., Benzon, H.-H., Larsen, G. B., Syndergaard, S., and Sørensen, M. B., Processing of GRAS/METOP radio occultation data recorded in closed-loop and raw-sampling modes, Atmos. Meas. Tech., 4, 1021-1026, doi: 10.5194/amt-4-1021-2011, 2011.
M. E. Gorbunov, V. Shmakov, S. S. Leroy, and K. B. Lauritsen, COSMIC Radio Occultation Processing: Cross-Center Comparison and Validation, J. Atmos. Oceanic Technol., 28, 737-751, doi: 10.1175/2011JTECHA1489.1, 2011.
S. B. Healy, Refractivity coefficients used in the assimilation of GPS radio occultation measurements, Journal of Geophysical Research, Vol. 116, D01106, doi: 10.1029/2010JD014013, 2011.
K. B. Lauritsen, S. Syndergaard, H. Gleisner, M. E. Gorbunov, F. Rubek, M. B. Sørensen, and H. Wilhelmsen, Processing and validation of refractivity from GRAS radio occultation data, Atmos. Meas. Tech., 4, 2065-2071, doi: 10.5194/amt-4-2065-2011, 2011.

2010

M. E. Gorbunov, K. B. Lauritsen, and S. S. Leroy, Application of Wigner distribution function for analysis of radio occultations, Radio Sci., 45, RS6011, doi: 10.1029/2010RS004388, 2010.
P. Poli, S. B. Healy, and D. P. Dee, Assimilation of Global Positioning System radio occultation data in the ECMWF ERAInterim reanalysis, Q. J. R. Meteorol. Soc. 136: 19721990. doi: 10.1002/qj.722, 2010.
M. P. Rennie, The impact of GPS radio occultation assimilation at the Met Office, Quarterly Journal of the Royal Meteorological Society, Vol. 136, No. 646, pp. 116-131. doi: 10.1002/qj.521, 2010.
F. Xie, D. L. Wu, C. O. Ao, E. R. Kursinski, A. J. Mannucci, and S. Syndergaard, Super-refraction effects on GPS radio occultation refractivity in marine boundary layers, GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L11805, doi: 10.1029/2010GL043299, 2010.

2009

A. von Engeln,, S. Healy, C. Marquardt, Y. Andres, and F. Sancho, Validation of Operational GRAS Radio Occultation Data, Geophys. Res. Lett., vol. 36, L17809, doi: 10.1029/2009GL039968, 2009.
M. E. Gorbunov and K. B. Lauritsen, Error Estimate of Bending Angles in the Presence of Strong Horizontal Gradients , pp. 17-26, in: "New Horizons in Occultation Research: Studies in Atmosphere and Climate", Steiner, A.; Pirscher, B.; Foelsche, U.; Kirchengast, G. (Eds.), Springer 2009.
H. W. Lewis, A Robust Method for Tropopause Altitude Identification Using GPS Radio Occultation Data, Geophys. Res. Lett., vol. 36, L12808, doi: 10.1029/2009GL039231, 2009.
A. Löscher, K. B. Lauritsen, and M. Sørensen, The GRAS SAF Radio Occultation Processing Intercomparison Project ROPIC , pp.47-60, in: "New Horizons in Occultation Research: Studies in Atmosphere and Climate", Steiner, A.; Pirscher, B.; Foelsche, U.; Kirchengast, G. (Eds.), Springer 2009.

2008

A. Löscher, C. Retscher, L. Fusco, P. Goncalves, F. Brito, G. Kirchengast, Variational optimization for global climate analysis on ESA's high performance computing grid, Remote Sensing of Environment 112 (2008) 1450-1463, 2008.
M. A. Ringer and S. B. Healy, Monitoring twenty-first century climate using GPS radio occultation bending angles, Geophys. Res. Lett., 35, L05708, doi: 10.1029/2007GL032462, 2008.

2007

S. B. Healy, J. Wickert, G. Michalak, T. Schmidt and G. Beyerle, Combined forecast impact of GRACE-A and CHAMP GPS radio occultation bending angle profiles, Atmospheric Science Letters, Volume 8, Issue 2, pages 43-50, doi: 10.1002/asl.149, 2007
M. E. Gorbunov and K. B. Lauritsen, Asymptotic methods of calculating the propagation of centimeter radio waves in the atmosphere in space-space paths, Izvestiya, Atmospheric and Oceanic Physics, Vol. 43, No. 6, pp. 745-754., doi: 10.1134/S0001433807060084, 2007
M. E. Gorbunov and K. B. Lauritsen, Linearized Zverev Transform and its application for modeling radio occultations , Radio Science, Vol. 42, RS3023 (9pp), doi: 10.1029/2006RS003590, 2007
S. B. Healy, J. R. Eyre, M. Hamrud and J.-N. Thépaut, Assimilating GPS radio occultation measurements with two-dimensional bending angle observation operators Q. J. R. Meteorol. Soc., 133, pp. 1213-1227, doi: 10.1002/qj.63, 2007

2006

G. Beyerle, T. Schmidt, J. Wickert, S. Heise, M. Rothacher, G. Konig-Langlo, and K. B. Lauritsen, Observations and simulations of receiver-induced refractivity biases in GPS radio occultation, JGR, vol 111, D12101, doi: 10.1029/2005JD006673, 2006.
M. E. Gorbunov, K. B. Lauritsen, A. Rhodin, M. Tomassini, and L. Kornblueh, Radio holographic filtering and error estimation of radio occultation data, JGR, vol 111, D10105, doi: 10.1029/2005JD006427, 2006.
M. E. Gorbunov and K. B. Lauritsen, Asymptotic wave optics methods in inversion and direct modeling of radio occultations: recent achievements, pp.81-94 in: 'Atmosphere and Climate: Studies by Occultation Methods', U. Foelsche, G. Kirchengast, A. Steiner, eds., Springer Verlag, 2006
M. E. Gorbunov and K. B. Lauritsen, Radio holographic filtering of noisy radio occultations, pp.127-134 in: 'Atmosphere and Climate: Studies by Occultation Methods', U. Foelsche, G. Kirchengast, A. Steiner, eds., Springer Verlag, 2006
J. Schulz, R. Lindau, N. Selbach, K. B. Lauritsen, H. Gleisner, Comparison of ATOVS, CHAMP and ground based humidity estimates on different spatiotemporal scales, Proceedings of the 15th International TOVS Study Conference (ITSC 15), October 2006

2005

M. E. Gorbunov and K. B. Lauritsen, Canonical Transform Methods for Analysis of Radio Occultations in: 'Earth Observation with CHAMP: Results from Three Years in Orbit', pp.519-524, eds. C. Reigber, H. Luehr, P. Schwintzer, and J. Wickert, Springer Verlag, Berlin, 2005
M. E. Gorbunov, K. B. Lauritsen, A. Rodin, M. Tomassini, and L. Kornblueh, Analysis of the CHAMP Experimental Data on Radio-Occultation Sounding of the Earth's Atmosphere (translated from Russian), Izvestiya, Atmospheric and Oceanic Physics, vol 41, no. 6, pp, 726-740, 2005.
Larsen, G.B., S. Syndergaard, P. Høeg, and M.B. Sørensen, Single frequency processing of Ørsted GPS radio occultation measurements, GPS Solut (2005) 9: 144-155, doi: 10.1007/s10291-005-0142-x, Springer Verlag 2005.
S. B. Healy, A. M. Jupp, and C. Marquardt, Forecast impact experiment with GPS radio occultation measurements, Geophys. Res. Lett., 32, L03804, doi: 10.1029/2004GL020806, 2005.
S. B. Healy and J.-N. Thépaut, Assimilation experiments with CHAMP GPS radio occultation measurements, Q. J. R. Meteorol. Soc., 132, pp. 605-623, 2006

2001 - 2004

S. Healy, Smoothing radio occultation bending angles above 40 km, Annales Geophysicae 19, pp. 459-468, 2001
A. D. Collard, S. Healy, The combined impact of future space-based atmospheric sounding instruments on numerical wheather prediction, Q. J. R. Meteorol. Soc. 129, pp. 2741-2760, 2003
M. E. Gorbunov and K. B. Lauritsen, Analysis of wave fields by Fourier integral operators and their application for radio occultations, Radio Science, Vol. 39(4), RS4010, doi: 10.1029/2003RS002971 (15pp), 2004

Reports

2008

M. Rennie, Report on the Assimilation of GPS Radio Occultation data into the Met Office global model
Met Office Forecasting Research Technical Report No. 510, Exeter, UK, 2008

2005

M. E. Gorbunov and K. B. Lauritsen, Radio holographic filtering of noisy radio occultations
DMI Scientific Report 05-06, DMI, Copenhagen, 2005
M. E. Gorbunov, Operational Processing of CH AMP Data: Mathematical Methods, Data Filtering and Quality Control
DMI Scientific Report 05-07, DMI, Copenhage n, 2005
S. de Haan, Global Maps from GPS Radio Occul tation Data
DMI Scientific Report 05-08, DMI, Copenhagen, 2005
G. Beyerle, Simulating GPS Radio Occultation Events
DMI Technical Report 05-09, DMI, Copenhagen, 2005
K. B. Lauritsen and F. Rubek, editors, 'GRAS SAF Open Loop Workshop', (see GOLW 2005)
DMI Technical Report 05-11, DMI, Copenhagen, 2005

2001 - 2004

M. E. Gorbunov, Radioholographic methods for processing radio occultation data in multipath regions
DMI Scientific Report No. 01-02, DMI, Copenhagen, 2001
M. E. Gorbunov, K. B. Lauritsen, Canonical Transform Methods for Radio Occultation Data
DMI Scientific Report No. 02-10, DMI, Copenhagen, 2002
K. B. Lauritsen, M. S. Lohmann, Unfolding of Radio Occultation Multipath Behavior Using Phase Models
DMI Scientific Report No. 02-11, DMI, Copenhagen, 2002
A. K. Steiner, Error Analyses of Refractivity Profiles Retrieved from CHAMP Radio Occultation Data
DMI Scientific Report 04-02, Copenhagen, 2004
J. Wickert, Comparison of Vertical Refractivity and Temperature Profiles From CHAMP With Radiosonde Measurements
DMI Scientific Report 04-09, DMI, Copenhagen, 2004