CIMA 09099
CENTRO DE INVESTIGACIONES DEL MAR Y LA ATMOSFERA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Representation of the SPCZ-SACZ teleconnection and Rossby wave propagation in the Southern Hemisphere in two GCMs
Autor/es:
SAURRAL, R.
Lugar:
Trieste, Italia
Reunión:
Conferencia; Conference on Teleconnections in the Atmosphere and Oceans; 2008
Institución organizadora:
International Center for Theoretical Physics (ICTP)
Resumen:
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General
Circulation Models (GCMs) are currently the main tool to assess Climate Change
projections for the upcoming decades. However, errors in the atmospheric
circulation representation in these models increase projections uncertainties.
The objective of the present study is to analyze the origin of the errors in
precipitation over South America in two GCMs: ECHAM5_MPI-OM (Roeckner et al,
2003) and GFDL_CM2.0 (Delworth et al, 2006) by studying the differences in the
atmospheric circulation of the Southern Hemisphere between the models and the
reanalysis. Particular emphasis is put in the South Pacific Convergence Zone (SPCZ)
- South Atlantic Convergence Zone (SACZ) tele-connection (Kalnay et al, 1986)
and in the propagation of Rossby waves between the Indian Ocean and South
America. OLR and upper-level wind fields are used as indicative of Rossby wave
generators and propagators. Datasets include NCEP/NCAR reanalysis and ECHAM5
and GFDL2.0 outputs for the 1980-1999 period.
