@Article{MeloOrsi:2008:InChOr,
author = "Melo, Luciene de and Orsini, Jose Antonio Marengo",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "The influence of changes in orbital Parameters over South American
climate using the CPTEC AGCM> simulation of climate during the mid
Holocene",
journal = "Holocene",
year = "2008",
volume = "18",
number = "4",
pages = "517--532",
keywords = "modelagem de clima, holoceno.",
abstract = "Climate change has been analysed for the mid Holocene (MH, 6000
years BP) over South America. Simulations have been performed
through modification of the orbital parameters and the CO2
concentration typical of the MH within the CPTEC T062L28
atmospheric general circulation models (AGCM). The results were
compared with previous simulations performed by various climate
centres around the world and with palaeoclimate indicators. The MH
climate simulation shows a wetter behaviour in northeastern South
America with a northward shift of the Intertropical Convergence
Zone (ITCZ). In central and southeastern South America the
simulations show a reduction in precipitation. Some important
changes were detected during the MH: (a) the increase in the
intensity of the circulation of the South Atlantic subtropical
high; (b) the intensification of the northerly flow east of the
Andes, south of 20šS; (c) the decrease in moisture transport from
the Amazon basin to central and south-southeastern Brazil, which
can influence the formation and intensity of the South Atlantic
Convergence Zone (SACZ); (d) the reduced intensity of the
northeasterly trade winds north of 20šS, which can explain the
northward positioning of the ITCZ; and (e) the weakening of the
low-level convergence over the Amazon region, which can explain
the reduction in precipitation in this region during the MH. A
cooling signal was verified during the MH simulation, in
accordance with palaeoclimate evidence, that was related to cold
air surges coming from the South, which cooled regions east of the
Andes and were more common during summer and autumn during the
MH.",
label = "lattes: 5719239270509869 2 MeloOrsi:2008:InChOr",
language = "en",
urlaccessdate = "25 abr. 2024"
}