Authors: Carla Gulizia Inés Camilloni Moira Doyle
Publish Date: 2012/08/01
Volume: 112, Issue: 1-2, Pages: 227-241
Abstract
The goal of this study is to assess the ability of a set of global climate models GCMs to represent the main regional spatial patterns of austral summer moisture transport in South America in order to evaluate if one of the possible causes of GCMs misestimating summer precipitation in this region could be associated with an erroneous representation of these patterns For this purpose NCEP/NCAR reanalysis and 20 GCMs from the WCRP/CMIP3 multimodel dataset for the period 1960–1999 were considered Extreme cases of moisture transport patterns were selected to assess their association with rainfall anomalies Results obtained indicate that only some aspects of water vapor transport and convergence in South America as well as the associated precipitation anomalies can be reproduced adequately by GCMs Finally a case study is presented showing that one of the moisture transport patterns identified was observed during December 2008–February 2009This research was supported by the University of Buenos Aires UBACYT20020100100803 Consejo Nacional de Investigaciones Científicas y Técnicas PIP200900444 and Agencia Nacional de Promoción Científica y Tecnológica PICT0700400 We acknowledge the Program for Climate Model Diagnosis and Intercomparison PCMDI for collecting and archiving the WCRP/CMIP3 model data
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