Estimation of refractivity uncertainties and vertical error correlations in collocated radio occultations, radiosondes, and model forecasts

Autor: Johannes K. Nielsen, Hans Gleisner, Stig Syndergaard, Kent B. Lauritsen

Random uncertainties and vertical error correlations are estimated for three independent data sets. The three collocated data sets are (1) refractivity profiles of radio occultation measurements retrieved from the Metop-A and B and COSMIC-1 missions,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ee249db13062db9af153936c51b46cc
https://amt.copernicus.org/articles/15/6243/2022/

The ROM SAF radio occultation climate data records and trend analyses

Autor: Kent B. Lauritsen, Hans Gleisner, Johannes K. Nielsen, Stig Syndergaard

Many studies have by now demonstrated the accuracy of GNSS Radio Occultation (RO) data, and their usefulness as a stable climate reference. Homogeneity of the data records are obtained by reprocessing of the data using uniform processing software thr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fde78c2bfe8699246ff455833f3fc857
https://doi.org/10.5194/egusphere-egu22-1442

Evaluation of the 15-year ROM SAF monthly mean GPS radio occultation climate data record

Autor: Stig Syndergaard, Johannes K. Nielsen, Kent B. Lauritsen, Hans Gleisner

Publikováno v: Atmospheric Measurement Techniques, Vol 13, Pp 3081-3098 (2020)

We here present results from an evaluation of the Radio Occultation Meteorology Satellite Application Facility (ROM SAF) gridded monthly mean climate data record (CDR v1.0), based on Global Positioning System (GPS) radio occultation (RO) data from th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1faa73ea62877cee6a7de2d310cc1e73
https://doi.org/10.5194/amt-2019-417

Radio occultation bending angle anomalies during tropical cyclones

Autor: Stig Syndergaard, Johannes K. Nielsen, Torsten Neubert, Riccardo Biondi

Publikováno v: Atmospheric Measurement Techniques, Vol 4, Iss 6, Pp 1053-1060 (2011)
Technical University of Denmark Orbit
Atmospheric Measurement Techniques
Biondi, R, Neubert, T, Syndergaard, S & Nielsen, J 2011, ' Radio occultation bending angle anomalies during tropical cyclones ', Atmospheric Measurement Techniques, vol. 4, no. 6, pp. 1053-1060 . https://doi.org/10.5194/amtd-4-1371-2011
Biondi, R, Neubert, T, Syndergaard, S & Nielsen, J 2010, ' Radio Occultation Bending Angle Anomalies During Tropical Cyclones ', OPAC-4 : International workshop on occultations for probing atmosphere and climate, Graz, Austria, 01/01/2010 . < http://www.uni-graz.at/opac2010/pdf_presentation/opac_2010_biondi_riccardo_presentation52.pdf >

The tropical deep convection affects the radiation balance of the atmosphere changing the water vapor mixing ratio and the temperature of the upper troposphere lower stratosphere. The aim of this work is to better understand these processes and to in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ced181383f74b5f8dc58a0d30c827f8f
https://www.atmos-meas-tech.net/4/1053/2011/

A New Algorithm for the Retrieval of Atmospheric Profiles from GNSS Radio Occultation Data in Moist Air and Comparison to 1DVar Retrievals

Autor: Barbara Scherllin-Pirscher, Johannes K. Nielsen, Ying Li, Yunbin Yuan, M. Schwaerz, Shu-peng Ho, Gottfried Kirchengast

Publikováno v: Remote Sensing
Volume 11
Issue 23
Pages: 2729
Remote Sensing, Vol 11, Iss 23, p 2729 (2019)

The Global Navigation Satellite System (GNSS) Radio Occultation (RO) is a key technique for obtaining thermodynamic profiles of temperature, humidity, pressure, and density in the Earth’s troposphere. However, due to refraction effects of both the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2378e6f88c14611eb87a8b13ed24991d
https://doi.org/10.3390/rs11232729