Atmospheric stability index using radio occultation refractivity profiles

Atmospheric sounding by GNSS radio occultation: An analysis of the negative refractivity bias using CHAMP observations

Validation studies of current GPS radio occultation experiments using meteorological analyses consistently report on a negative refractivity bias in the lower troposphere. It is shown that refractivity profiles obtained from Doppler-inverted bending angle profiles not only deviate significantly within zones of multipath propagation but also depend on the selected end point of the occultation si...

The power of vertical geolocation of atmospheric profiles from GNSS radio occultation

High-resolution measurements from Global Navigation Satellite System (GNSS) radio occultation (RO) provide atmospheric profiles with independent information on altitude and pressure. This unique property is of crucial advantage when analyzing atmospheric characteristics that require joint knowledge of altitude and pressure or other thermodynamic atmospheric variables. Here we introduce and demo...

Evaluation of a non-local observation operator in assimilation of CHAMP radio occultation refractivity with WRF

Atmospiieric Profiles from Radio Occultation Measurements of Gps Satellites

Atmospheric profiles can be retrieved with techniques utilizing measurements of the propagation delay of signals from Global Positioning System (GPS) satellites observed by one or more receivers in low earth orbit. The. observations are made in a limb-sounding geometry when the radio path between the transmitter and receiver passes through the atmosphere. The various componen~s of the microwave...

Estimation of tropospheric profiles using COSMIC GPS radio occultation data with neural networks

In this work we have proposed a method based on neural networks to directly retrieve dry and wet refractivity and dry pressure profiles in troposphere (which in turn can be used to obtain temperature and humidity profiles) by using COSMIC GPS radio occultation (RO) data. To overcome the constraint of an independent knowledge of one atmospheric parameter at each GPS occultation, we trained diffe...