CIMA   09099
CENTRO DE INVESTIGACIONES DEL MAR Y LA ATMOSFERA
Unidad Ejecutora - UE
artículos
Título:
A high-resolution 43-year atmospheric hindcast for South America generated with the MPI regional model.
Autor/es:
SILVESTRI, GABRIEL; VERA, CAROLINA; JACOB, DANIELA; PFEIFER, SUSANA; TEICHMANN, CLAUS
Revista:
CLIMATE DYNAMICS
Editorial:
Springer-Verlag
Referencias:
Lugar: Berlin, Alemania; Año: 2008 p. 1 - 38
ISSN:
0930-7575
Resumen:
An evaluation of the present-day climate in South America simulated by the MPI
atmospheric limited area model, REMO, is made. The model dataset was generated by dynamical
downscaling from the ECMWF-ERA40 reanalysis and compared to in-situ observations.
The model is able to reproduce the low-level summer monsoon circulation but it has some
deficiencies to represent the South American Low-Level Jet structure. At upper levels, summer
circulation features like the Bolivian High and the associated subtropical jet are well simulated by
the model. Sea-level pressure fields are in general well represented by REMO.
The model exhibits reasonable skill in representing the general features of the mean seasonal
cycle of precipitation. Nevertheless, there is a systematic overestimation of precipitation at both
tropical and subtropical regions. Differences between observed and modeled temperature are
smaller than 1.5°C over most of the continent, excepting during spring when those differences are
quite large.
Results show that the dynamical downscaling performed using REMO introduces
enhancement of the global reanalysis specially in temperature at the tropical regions during the
warm season and in precipitation at both the subtropics and extratropics. These results suggest that
REMO can be a useful tool for regional downscaling of global simulations of present and future
climates.