The influence of changes in orbital parameters over South American climate using the CPTEC AGCM: simulation of climate during the mid Holocene

Melo, Maria Luciene Dias de; Marengo, José A.

doi:10.1177/0959683608089205

Cited by 23 publications

(5 citation statements)

References 45 publications

(99 reference statements)

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“…The precipitation decrease occurs over most of the continent, with the exception of the north-eastern tip of the continent, as a result of weakened monsoon winds and reduced convection. This is consistent with previous model studies (Valdes, 2000;Kitoh and Murakami, 2002;Liu et al, 2004;Dias De Melo and Marengo, 2008). The precipitation increase over the north-eastern coast could be a sign of monsoon retreat, as well as a shift in the ITCZ, because upward motion between the equator and 10 • S over the Atlantic is stronger as the ITCZ shifts northward in response to a weakened poleward insolation gradient.…”

Section: The South American Monsoonsupporting

confidence: 92%

“…The precipitation increase over the north-eastern coast could be a sign of monsoon retreat, as well as a shift in the ITCZ, because upward motion between the equator and 10 • S over the Atlantic is stronger as the ITCZ shifts northward in response to a weakened poleward insolation gradient. The South Atlantic Subtropical High is located slightly closer to the continent, which is in agreement with Dias De Melo and Marengo (2008) in their DJF average. Although previous model studies agree on the general pattern of the MH monsoon over South America, more research is required because only two of the studies mentioned here are coupled ocean-atmosphere models (Kitoh and Murakami, 2002;Liu et al, 2004), both using a relatively low resolution.…”

Section: The South American Monsoonsupporting

confidence: 87%

“…These paleodata studies do not clearly indicate wetter conditions in north-east Brazil, which does occur in the ECEarth Mid-Holocene experiment as well as in other models (Valdes, 2000;Kitoh and Murakami, 2002;Liu et al, 2004;Dias De Melo and Marengo, 2008).…”

Section: Ec-earth Vs Paleodatacontrasting

confidence: 63%

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Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

et al. 2012

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Abstract.In this study, we use a sophisticated highresolution atmosphere-ocean coupled climate model, ECEarth, to investigate the effect of Mid-Holocene orbital forcing on summer monsoons on both hemispheres. During the Mid-Holocene (6 ka), there was more summer insolation on the Northern Hemisphere than today, which intensified the meridional temperature and pressure gradients. Over North Africa, monsoonal precipitation is intensified through increased landward monsoon winds and moisture advection as well as decreased moisture convergence over the oceans and more convergence over land compared to the pre-industrial simulation. Precipitation also extends further north as the ITCZ shifts northward in response to the stronger poleward gradient of insolation. This increase and poleward extent is stronger than in most previous ocean-atmosphere GCM simulations. In north-westernmost Africa, precipitation extends up to 35 • N. Over tropical Africa, internal feedbacks completely overcome the direct warming effect of increased insolation. We also find a weakened African Easterly Jet. Over Asia, monsoonal precipitation during the Mid-Holocene is increased as well, but the response is different than over North-Africa. There is more convection over land at the expense of convection over the ocean, but precipitation does not extend further northward, monsoon winds over the ocean are weaker and the surrounding ocean does not provide more moisture. On the Southern Hemisphere, summer insolation and the poleward insolation gradient were weaker during the Mid-Holocene, resulting in a reduced South American monsoon through decreased monsoon winds and less convection, as well as an equatorward shift in the ITCZ. This study corroborates the findings of paleodata research as well as previous model studies, while giving a more detailed account of Mid-Holocene monsoons.

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Section: The South American Monsoonsupporting

confidence: 92%

Section: The South American Monsoonsupporting

confidence: 87%

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Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

et al. 2012

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“…In South America, lake levels were lower during the Mid-Holocene (Baker et al, 2001;Sifeddine et al, 2001;Turcq et al, 2002) and studies of pollen and ocean cores show a general drying and imply a more northerly location of the ITCZ (Mayle et al, 2000;Haug et al, 2001;Behling, 2002). These paleodata studies do not clearly indicate wetter conditions in north-east Brazil, which does occur in the EC-Earth Mid-Holocene experiment as well as in other models (Valdes, 2000;Kitoh and Murakami, 2002;Liu et al, 2004;Dias De Melo and Marengo, 2008).…”

Section: Ec-earth Vs Paleodatamentioning

confidence: 91%

Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

Bosmans¹,

Drijfhout²,

Tuenter³

et al. 2011

Preprint

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In this study we use a sophisticated high-resolution atmosphere-ocean coupled climate model, EC-Earth, to investigate the effect of Mid-Holocene orbital forcing on summer monsoons on both hemispheres. During the Mid-Holocene (6 ka), there was more summer insolation on the Northern Hemisphere than today, which intensified the meridional temperature and pressure gradients. Over North Africa, monsoonal precipitation is intensified through increased landward monsoon winds and moisture advection as well as decreased moisture convergence over the oceans and more convergence over land compared to the pre-industrial simulation. Precipitation also extends further north as the ITCZ shifts northward in response to the stronger poleward gradient of insolation. This increase and poleward extent is stronger than in most previous ocean-atmosphere GCM simulations. In north-westernmost Africa, precipitation extends up to 35° N. Over tropical Africa, internal feedbacks completely overcome the direct warming effect of increased insolation. We also find a weakened African Easterly Jet. Over Asia, monsoonal precipitation during the Mid-Holocene is increased as well, but the response is different than over North-Africa. There is more convection over land at the expense of convection over the ocean but precipitation does not extend further northward, monsoon winds over the ocean are weaker and the surrounding ocean does not provide more moisture. On the Southern Hemisphere, summer insolation and the poleward insolation gradient were weaker during the Mid-Holocene, resulting in a reduced South American monsoon through decreased monsoon winds and less convection, as well as an equatorward shift in the ITCZ. This study corroborates the findings of paleodata research as well as previous model studies, while giving a more detailed account of Mid-Holocene monsoons

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“…8.1 Sugestões de trabalhos futuros ------------------------------------------------------------------ MARENGO, 2008;CHIESSI, 2013;ROJAS et al, 2016;SHIMIZU et al, 2020;SILVA DIAS et al, 2009).…”

Section: Conclusões -------------------------------------------------...unclassified

Sistema de Monção da América do Sul: padrões de variabilidade durante os últimos 21.000 anos

Custódio¹

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The influence of changes in orbital parameters over South American climate using the CPTEC AGCM: simulation of climate during the mid Holocene

Cited by 23 publications

References 45 publications

Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

Monsoonal response to mid-holocene orbital forcing in a high resolution GCM

Sistema de Monção da América do Sul: padrões de variabilidade durante os últimos 21.000 anos

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