Case studies analysis of GWs from Rayleigh LIDAR, GPS Radio Occultation and SABER observations above the southern tip of South America (Rio Gallegos, Argentina, 51.6°S, 69.3°W)

LLAMEDO, P.; ALEXANDER, P.; DE LA TORRE, A.; QUIROGA, J.; SCHMIDT, T.; SALVADOR, J.; HIERRO, R.

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Congreso; Occultations for Probing Atmosphere and Climate 6; 2016

Case studies from gravity wave (GW) activity in theupper stratosphere and lower mesosphere (USLM) are investigated fromtemperature (T) Rayleigh lidar data retrieved at Rio Gallegos, Argentina(51.6°S, 69.3°W) between August 2005 and November 2015. From a total of 302Rayleigh lidar observations providing more than 1500h of data, large amplitudeevents are selected . Awavelet analysis is performed to study the vertical wave components as well asthe existence of possible critical levels. T perturbations mainly atstratospheric levels show a stationary behaviour suggesting the orographicorigin. From a set of collocations with satellite line of sights at the lidarposition within a window of 4x4 deg and +/-12 h, GPS radio occultation (RO) andSounding of the Atmosphere using Broadband Emission Radiometry (SABER) T dataare here considered. The selected case studies show large amplitude nonhydrostatic GWs with long vertical waves. The collocations and soundings atlimb and nadir directions allow for an analysis of momentum flux, given theavailability of actual horizontal and vertical wavelenghts, applying atheoretical model. A comparison with previous modelling and experimentalresults at this region is performed.The stationary/not stationary behaviour ofdifferent altitude intervals of the lidar profiles, may be derived from thelidar?s time series.