Browsing by Autor "Quel, E."

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Evaluation of inversion algorithm sensitivity in stratospheric ozone DIAL profile.
(Revista Boliviana de Física, 2012) Orte, F.; Wolfram, E.; Salvador, J.; D’Elia, R.; Quel, E.
The DIAL system belonging to Observatorio Atmosférico de la Patagonia Austral, Río Gallegos, Argentina has been included in the NDACC since December 2008. One caveat of large networks such as NDACC is the difficulty to report information of similar nature consistently from one research group (or instrument) to another. The inversion algorithm used in the stratospheric ozone DIAL measurements involves different source of systematic and statistic errors. Due to the rapid decrease of the signal-to- noise ratio in the high stratosphere, it is necessary to degrade the vertical resolution of the measurement in order to limit the statistical error at this altitude range, to reasonable values. The final statistical error on the measurement is the result of a compromise between the experimental system characteristics such as the duration of the measurement and the final vertical resolution. The aim of this study is test the DIAL algorithm resolution used to retrieve the ozone profile comparing with the synthetic ozone profile. This synthetic ozone profile is calculated by mean of lidar equation using an ECC sonde profile as input parameter. This ozone profile was measured with an ozonesonde launched in Río Gallegos in March 2011 as part of intercomparison campaign.
Rayleigh lidar temperature profiles between 15 - 60 km during OZITOS campaign in Río Gallegos (51° 55'S, 69° 14'W), Argentina
(Revista Boliviana de Física, 2012) Salvador, J.; Wolfram, E.; Orte, F.; Bulnes, D.; D’Elia, R.; Quel, E.
The determination of temperature measurements from the Rayleigh scattering is an important remote sensing technique for obtaining stratospheric profiles. This technique is applied to signals acquired by a Rayleigh lidar (Light Detection and Ranging). Currently the Observatorio Atmosférico de la Patagonia Austral (51° 55'S, 69° 14'W) in Río Gallegos, Argentina is part of the UVO3Patagonia project in collaboration with the laboratory of Ozone and UV Radiation in the city of Punta Arenas, Chile distant 200 km, for more information www.uvo3patagonia.com. In this paper we showed the technique to measure temperature profiles in the stratosphere between 15-60 km altitude. We compared the temperature profiles obtained of the second ozone sounding campaign called OZITOS (OZone profile aT RíO GallegOS) carried out in March 2011 in Río Gallegos with the temperature profile retrieved by the Rayleigh lidar using the line of 355 nm, in the same period. The results presented in this paper are validated through intercomparisons with measurements made by MLS instrument (Microwave Limb Sounder) onboard the NASA AURA satellite platform and NCEP data.
Systematic Ozone and Solar UV Measurements in the Observatorio Atmosférico de la Patagonia Austral, Argentina
(Revista Boliviana de Física, 2012) Wolfram, E.; Salvador, J.; Orte, F; D’Elia, R.; Quel, E.
The depletion of the polar ozone layer is one of the strongest anthropogenic signals in the Earth system. Subpolar regions in the southern part of South America are affected by this phenomenon, covered sometimes by air masses with less ozone than normal with the corresponding UV enhancements at ground surface. Motivated by these atmospheric events, Argentina and Chile with the financial support of JICA has joined scientific efforts to develop UVO3 Patagonia project. It has as main objectives monitoring ozone and UV radiation in Southern Patagonia. The Ozone and RUV laboratory (Chile) and the Lidar Division of CEILAP (Argentina) are the execute laboratories of this project. The Observatorio Atmosférico de la Patagonia Austral (Atmospheric Observatory of Southern Patagonia) is located in South Patagonia (51º 55'S, 69º 14'W), in subpolar region and it is a convenient monitoring site of the atmosphere in the Southern Hemisphere. In this experimental site is operative a differential absorption lidar instrument (DIAL) for the measurement of ozone vertical distribution. This instrument belongs of Network Data for Atmospheric Composition Change (NDACC). The altitude range of the ozone measurement is 14-45 km, which provides the opportunity to monitor the perturbations due to the passage of stratospheric polar air over Río Gallegos. Systematic stratospheric ozone profile measurement has been carried on in this experimental site since 2005. We identified three mayor perturbation of ozone hole over the stratospheric ozone profile in Río Gallegos. Approach of polar vortex during late winter, overpass of ozone hole in middle spring and dilution process during late spring change the shape and content of stratospheric ozone profile and by consequences the solar UV. Solar surface irradiance and total ozone content were measured with a Brewer spectraphotometer and moderate narrow band radiometer GUV-541 deployed in the Río Gallegos experimental site. Depleted ozone columns were measured during ozone hole overpass, and the analysis of unique extreme ozone depletion event in November 2009 is reported and compared with Multisensor Data Reanalysis of TOMS/OMI satellite data.