INVESTIGADORES
DE LA TORRE Alejandro
congresos y reuniones científicas
Título:
VARIABILITY OF THE UPPER TROPOSPHERE AND LOWER STRATOSPHERE OBSERVED WITH GPS RADIO OCCULTATION TEMPERATURES
Autor/es:
TORSTEN SCHMIDT, PABLO LLAMEDO, ALEJANDRO DE LA TORRE, STEFAN HEISE, FLORIAN ZUS, GEORG BEYERLE, ANTONIA FABER, JENS WICKERT
Lugar:
Buenos Aires
Reunión:
Workshop; 7th IAGA / ICMA / CAWSES Workshop on Long-Term Changes and Trends in the Atmosphere; 2012
Institución organizadora:
IAGA / ICMA / CAWSES
Resumen:
The radio occultation (RO) technique uses GPS signals received aboard low Earth orbiting
satellites for atmospheric limb sounding. Temperature profiles are derived with high vertical
resolution. Due to its long-term stability, all-weather capability and global coverage the GPS
RO technique offers the possibility for global monitoring of the tropopause and temperature
structure in the upper troposphere and lower stratosphere (UTLS) region. Each, the German
CHAMP (2001-2008), the TerraSAR-X (since 2007), and the US/German GRACE (since
2006) missions provide between 150-200 occultation measurements daily. Based on these
datasets a global increase of the tropopause height of about 7 m/year is detected since 2001.
The tropopause rising is in agreement with a global upper tropospheric warming and a
predominant lower stratospheric cooling observed for the same time interval. Regional trend
patterns, mainly for the tropical tropopause region in relation to water vapor and ozone
variability, are discussed.