NDLI: Development of regional future climate change scenarios in South America using the Eta CPTEC/HadCM3 climate change projections: climatology and regional analyses for the Amazon, São Francisco and the Paraná River basins

Content Provider	Springer Nature Link
Author	Marengo, Jose A. Chou, Sin Chan Kay, Gillian Alves, Lincoln M. Pesquero, José F. Soares, Wagner R. Santos, Daniel C. Lyra, André A. Sueiro, Gustavo Betts, Richard Chagas, Diego J. Gomes, Jorge L. Bustamante, Josiane F. Tavares, Priscila
Copyright Year	2011
Abstract	The objective of this study is to assess the climate projections over South America using the Eta-CPTEC regional model driven by four members of an ensemble of the Met Office Hadley Centre Global Coupled climate model HadCM3. The global model ensemble was run over the twenty-first century according to the SRES A1B emissions scenario, but with each member having a different climate sensitivity. The four members selected to drive the Eta-CPTEC model span the sensitivity range in the global model ensemble. The Eta-CPTEC model nested in these lateral boundary conditions was configured with a 40-km grid size and was run over 1961–1990 to represent baseline climate, and 2011–2100 to simulate possible future changes. Results presented here focus on austral summer and winter climate of 2011–2040, 2041–2070 and 2071–2100 periods, for South America and for three major river basins in Brazil. Projections of changes in upper and low-level circulation and the mean sea level pressure (SLP) fields simulate a pattern of weakening of the tropical circulation and strengthening of the subtropical circulation, marked by intensification at the surface of the Chaco Low and the subtropical highs. Strong warming (4–6°C) of continental South America increases the temperature gradient between continental South America and the South Atlantic. This leads to stronger SLP gradients between continent and oceans, and to changes in moisture transport and rainfall. Large rainfall reductions are simulated in Amazonia and Northeast Brazil (reaching up to 40%), and rainfall increases around the northern coast of Peru and Ecuador and in southeastern South America, reaching up to 30% in northern Argentina. All changes are more intense after 2040. The Precipitation–Evaporation (P–E) difference in the A1B downscaled scenario suggest water deficits and river runoff reductions in the eastern Amazon and São Francisco Basin, making these regions susceptible to drier conditions and droughts in the future.
Starting Page	1829
Ending Page	1848
Page Count	20
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	38
Issue Number	9-10
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	South America Climate change Downscaling Amazon region Meteorology/Climatology Oceanography Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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