South American Summer Monsoon variability over the last millennium in paleoclimate records and isotope-enabled climate models
Abstract δ 18 O proxy records and compare them with modes decomposed from isotope-enabled climate model data. The two leading modes reflect the isotopic variability associated with (1) thermodynamic changes driving the upper-tropospheric monsoon circulation (Bolivian High–Nordeste Low waveguide) and (2) the latitudinal displacement of the South Atlantic Convergence Zone (SACZ). The spatial characteristics of these modes appear to be robust features of the LM hydroclimate over South America and are reproduced both in the proxy data and in isotope-enabled climate models, regardless of the nature of the model-imposed external forcing. The proxy data document that the SASM was characterized by considerable temporal variability throughout the LM, with significant departures from the mean state during both the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA). Model analyses during these periods suggest that the local isotopic composition of precipitation is primarily a reflection of upstream rainout processes associated with monsoon convection. Model and proxy data both point to an intensification of the monsoon during the LIA over the central and western parts of tropical South America and indicate a displacement of the South Atlantic Convergence Zone (SACZ) to the southwest. These centennial-scale changes in monsoon intensity over the LM are underestimated in climate models, complicating the attribution of changes on these timescales to specific forcings and pointing toward areas of important model development.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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South American Summer Monsoon variability over the last millennium in paleoclimate records and isotope-enabled climate models ; volume:18 ; number:9 ; year:2022 ; pages:2045-2062 ; extent:18
Climate of the past ; 18, Heft 9 (2022), 2045-2062 (gesamt 18)
- Creator
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Orrison, Rebecca
Vuille, Mathias
Smerdon, Jason E.
Apaéstegui, James
Azevedo, Vitor
Campos, Jose Leandro P. S.
Cruz, Francisco W.
Della Libera, Marcela Eduarda
Stríkis, Nicolás M.
- DOI
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10.5194/cp-18-2045-2022
- URN
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urn:nbn:de:101:1-2022090805242155800371
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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16.10.20242200, 11:25 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Orrison, Rebecca
- Vuille, Mathias
- Smerdon, Jason E.
- Apaéstegui, James
- Azevedo, Vitor
- Campos, Jose Leandro P. S.
- Cruz, Francisco W.
- Della Libera, Marcela Eduarda
- Stríkis, Nicolás M.
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