TEMPERATURE PROFILES OBSERVED DURING AN UNUSUAL DEPLETION OF OZONE OVER NDACC STATION OF RÍO GALLEGOS (51° 55’S, 69° 14’W) -ARGENTINA ON NOVEMBER 2009

JACOBO SALVADOR, ELIAN WOLFRAM, FACUNDO ORTE, DANIELA BULNES, SOPHIE GODIN-BEEKMANN, EDUARDO QUEL

porto Heli

Congreso; 26th International Laser Radar Conference; 2012

Since June 2005, the CEILAP-UNIDEF (MINDEF-CONICET), UMI-IFAECI-CNRS group with the support of JICA (Japanese International Cooperation Agency) and cooperation with french research has carried out systematic measurements of ozone profile and UV radiation in the southern part of Argentina (51° 55’S, 69° 14’W). Since 2006 we began to obtain other products associated with the same measurement of ozone, as stratospheric aerosols and temperature profiles using the third harmonic of a Nd:YAG Quantel YG-980 laser at 355 nm. Through the time we have improved the algorithm for retrieve temperature profile. In this work we present the incorporation of a digital filter called Savitky-Golay. We have evaluated the filter can characterize the windows point as a function of cutoff frequency. Through extensive simulations we have found a power law representative of the filter behavior. Also we have incorporated a new database of temperature calculated from the model MSISE-90. As a part the evaluation of this algorithm we have detected an unusual temperature profiles on November 2009 due a depletion of the ozone density. We present the comparison of this profiles measured during November 13-14 2009, compared with the NCEP mean profiles in Río Gallegos for the period 2005-2011. We have found a warming in the higher stratosphere with an absolute error of 25 K around 36 km when the temperature profile was compared with the NCEP mean profile. In the lower part of the profile around 16 km we have found temperature coldest than the upper part.