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. We revise selected findings regarding the utilization of GlobalPositioning System radio occultation (GPS RO) density profiles forthe analysis of internal gravity waves (IGW), introduced by Sacha et al. ( 2014 ) . Using various GPS RO datasets, we show that thedifferences in the IGW spectra between the dry-temperature anddry-density profiles that were described in the previous study asa general issue are in fact present in one specific data versiononly. The differences between perturbations in the temperature anddensity GPS RO profiles do not have any physical origin, and there isnot the information loss of IGW activity that was suggested in Sacha et al. ( 2014 ) . We investigate the previously discussed questionof the temperature perturbations character when utilizing GPS ROdry-temperature profiles, derived by integration of the hydrostaticbalance. Using radiosonde profiles as a proxy for GPS RO, we providestrong evidence that the differences in IGW perturbations betweenthe real and retrieved temperature profiles (which are based on theassumption of hydrostatic balance) include a significantnonhydrostatic component that is present sporadically and might beeither positive or negative. The detected differences in relatedspectra of IGW temperature perturbations are found to be mostlyabout ±10 % . The paper also presents a detailed study on the utilization of GPSRO density profiles for the characterization of the wave fieldstability. We have analyzed selected stability parameters derivedfrom the density profiles together with a study of the verticalrotation of the wind direction. Regarding the Northern Hemispherethe results point to the western border of the Aleutian high, wherepotential IGW breaking is detected. These findings are alsosupported by an analysis of temperature and wind velocityprofiles. Our results confirm advantages of the utilization of thedensity profiles for IGW analysis.

atmospheric measurement techniques

Revisiting internal gravity waves analysis using GPS RO density profiles: comparison with temperature profiles and application for wave field stability study