STRATOSPHERIC TEMPERATURE BEHAVIOR IN THE SOUTHERN HEMISPHERE

PATRICIA FERNÁNDEZ DE CAMPRA; MARTA M. ZOSSI

Buenos Aires

Conferencia; XI Conferencia Latinoamericana de Geofísica Espacial (XI COLAGE); 2018

Asociación Latinoamericana de Geofisica Espacial (ALAGE)

Recent research has shown the importance of stratospheric effects over the troposphere. Therefore, the stratosphere could be used as a predictor of climate in the troposphere. Since changes in the stratospheric circulation could be interpreted from the stratospheric temperature trends, the long-term variation of the stratospheric temperature for the period 1979 - 2016 was analyzed in this work. Monthly average temperature of the Southern Hemisphere, between 10hPa and 100 hPa, of the NCEP/NCAR reanalysis data set was used. A similar behavior was observed from 30 hPa and 100 hPa temperatures, showing the influence of El Chicho´n and Pinatubo eruptions. In all analyzed heights, the temperature decreases during the period studied, with trend values between 0.5 and 1.1 K/decade. If we consider the period from the year 2000, the year in which ozone recovery begins, the negative trend remains at 10 hPa, and a significant positive trend is observed only at 100 hPa, of the order of 0.12 K/decade. When analyzing the seasonal variation (DJF, MAM, JJA and SON) it is observed that SON shows the greatest negative trend for the different heights. The results are compared with others obtained by models and observations