4.6 Article

Impact of projected SST changes on summer rainfall in southeastern South America

Journal

CLIMATE DYNAMICS
Volume 40, Issue 7-8, Pages 1569-1589

Publisher

SPRINGER
DOI: 10.1007/s00382-013-1695-y

Keywords

South America climate; Rainfall changes; Two-way nesting system; Sea surface temperature projections; Climate change

Funding

  1. Office of Science, U.S. Department of Energy
  2. European Commission [212492]
  3. CNRS/LEFE Program
  4. CONICET [PIP 112-200801-00399]
  5. Ecole Polytechnique

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Recent studies have shown that global warming and associated sea-surface temperature (SST) changes may trigger an important rainfall increase in southeastern South America (SESA) during the austral summer (December-January-February, DJF). The goal of this paper is to provide some insight into processes which may link global and SESA changes. For this purpose, a two-way nesting system coupling interactively the regional and global versions of the LMDZ4 atmospheric model is used to study the response to prescribed SST changes. The regional model is a variable-grid version of the global model, with a zoom focused over South America. An ensemble of simulations forced by distinct patterns of DJF SST changes has been carried out using a decomposition of full SST changes into their longitudinal and latitudinal components. The full SST changes are based on projections for the end of the twenty-first century from a multi-model ensemble of WCRP/CMIP3. Results confirm the presence of a major rainfall dipole structure, characterized by an increase in SESA and a decrease in the South Atlantic Convergence Zone region. Rainfall changes found in the WCRP/CMIP3 models are largely explained as a response of this dipole structure to the zonally-asymmetric (or longitudinal) component of SST changes. The rainfall response to the zonal-mean (or latitudinal) SST changes (including the global warming signal itself) shows an opposite contribution. The processes explaining the role of zonally-asymmetric SST changes involve remote effects of SST warming over the equatorial Indian and Pacific oceans inducing an atmospheric wave-train extended across the South Pacific into South America.

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