1. Centro de Investigaciones en Láseres y Aplicaciones (LASER RESEARCH CENTER AND APPLICATIONS ) (CITEFA-CONICET) Buenos Aires - Argentina Collaboration between CEILAP, LATMOS-IPSL and JICA

2. Province of Santa Cruz, Argentine Patagonia. Lat: 51º 36’ S, Lon: 69º 19’ W. Military Air Force Base, Río Gallegos - Fuerza Aérea Argentina (FFAA) Río Gallegos Site (CEILAP-RG)

3. Little History of RG Site Events 2004Jun 2005Aug 2005-Dec 2006Sep 2007 DIAL Ozone Instrument Ready to measure Transportation Of Instrument to Rio Gallegos Site SOLAR Campaign Start with UVO3Patagonia Project Dec 2008 Admission of DIAL Ozone Inst. To NDACC Network First Ozone Sonde Campaign in Río Gallegos Mar 2010

4. Argentina – Chile collaboration 3 sondes launched in Río Gallegos site, collocated with DIAL during first week of March

5. Time Evolution of Total Ozone in Río Gallegos (2009) Study case 1 (October 3 and 4) Prolonged O3 Reduction Extreme Event (November 2009)

6. Study Case 1 of Ozone Hole overpass in RG Site during 2009 OMI/AURA Oct 2 2009 Oct 4 2009 Oct 6 2009

7. New Capability of Temperature Lidar Profile in RG Site Comparison Lidar with HIRDLS/AURA-NASA Mean ± 1σ dev HIRDLS Error bars are plus and minus 1σ dev ΔS < 500 Km ΔT ± 12 Hs N = 94 Measurements Temperature Profiles Without Correction by Aerosols using Lidar Rayleigh Temperature Profiles With Correction by Aerosols using Lidar Rayleigh 1 Km Resolution HIRDLS

8. UVI & partial ozone loss column changes Regions of potential UV enhancements linked to vortex occurrences in a cloudiness diminution scenario October (no cloud discrimination) Vortex occurrences TOC changes Vortex occurrences TOC changesUVI changes Regions R1 & R6, the most affected by vortex occurrences & polar ozone loss Maximum UV increase are observed in region R1 due to low cloud clover conditions If changes in cloud clover, R6 is the most sensitive region ► ► ► October (quasi-clear sky) [40°S-60°S] latitude band

9. Polar region: Antarctica Evolution of chemical ozone loss over Antarctica since 1980 Increased variability since 2000 2002 2004 1 st major warming observed over Antarctica: split of the polar vortex and the ozone hole spring 2002 2006

10. Perspectives  Monitoring of atmospheric composition at Rio Gallegos (ozone, aerosol, UV, temperature)  Very few measurement stations in the SH for long term trend studies and cross-validation of satellite time series  Network for the Detection of Atmospheric Composition Changes (NDACC) southern mid-latitudes stations: Lauder (NZ) and Rio Gallegos (Argentina)  More instruments are being implemented (microwave radiometer, U. Nagoya)  Study of the recovery of the Antarctic ozone hole in relation with climate change