A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.)

 

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dc.contributor.author Woodborne, Stephan en_ZA
dc.contributor.author Hall, Grant en_ZA
dc.contributor.author Robertson, Iain en_ZA
dc.contributor.author Patrut, Adrian en_ZA
dc.contributor.author Rouault, Mathieu en_ZA
dc.contributor.author Loader, Neil J en_ZA
dc.contributor.author Hofmeyr, Michele en_ZA
dc.date.accessioned 2015-11-10T14:50:25Z
dc.date.available 2015-11-10T14:50:25Z
dc.date.issued 2015 en_ZA
dc.identifier.citation Woodborne, S., Hall, G., Robertson, I., Patrut, A., Rouault, M., Loader, N. J., & Hofmeyr, M. (2014). A 1000-Year Carbon Isotope Rainfall Proxy Record from South African Baobab Trees (Adansonia digitata L.). PloS one, 10(5), e0124202. doi:10.1371/journal.pone.0124202 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/14845
dc.identifier.uri http://dx.doi.org/10.1371/journal.pone.0124202
dc.description.abstract A proxy rainfall record for northeastern South Africa based on carbon isotope analysis of four baobab ( Adansonia digitata L.) trees shows centennial and decadal scale variability over the last 1,000 years. The record is in good agreement with a 200-year tree ring record from Zimbabwe, and it indicates the existence of a rainfall dipole between the summer and winter rainfall areas of South Africa. The wettest period was c. AD 1075 in the Medieval Warm Period, and the driest periods were c. AD 1635, c. AD 1695 and c. AD1805 during the Little Ice Age. Decadal-scale variability suggests that the rainfall forcing mechanisms are a complex interaction between proximal and distal factors. Periods of higher rainfall are significantly associated with lower sea-surface temperatures in the Agulhas Current core region and a negative Dipole Moment Index in the Indian Ocean. The correlation between rainfall and the El Niño/Southern Oscillation Index is non-static. Wetter conditions are associated with predominantly El Niño conditions over most of the record, but since about AD 1970 this relationship inverted and wet conditions are currently associated with la Nina conditions. The effect of both proximal and distal oceanic influences are insufficient to explain the rainfall regime shift between the Medieval Warm Period and the Little Ice Age, and the evidence suggests that this was the result of a northward shift of the subtropical westerlies rather than a southward shift of the Intertropical Convergence Zone. en_ZA
dc.language.iso eng en_ZA
dc.publisher Public Library of Science en_ZA
dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/4.0 en_ZA
dc.source PLoS One en_ZA
dc.source.uri http://journals.plos.org/plosone en_ZA
dc.subject.other Trees en_ZA
dc.subject.other El Niño-Southern Oscillation en_ZA
dc.subject.other Rain en_ZA
dc.subject.other Isotopes en_ZA
dc.subject.other Indian Ocean en_ZA
dc.subject.other Paleoclimatology en_ZA
dc.subject.other Radioactive carbon dating en_ZA
dc.subject.other Africa en_ZA
dc.title A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.) en_ZA
dc.type Journal Article en_ZA
dc.rights.holder © 2015 Woodborne et al en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Oceanography en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Woodborne, S., Hall, G., Robertson, I., Patrut, A., Rouault, M., Loader, N. J., & Hofmeyr, M. (2015). A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.). <i>PLoS One</i>, http://hdl.handle.net/11427/14845 en_ZA
dc.identifier.chicagocitation Woodborne, Stephan, Grant Hall, Iain Robertson, Adrian Patrut, Mathieu Rouault, Neil J Loader, and Michele Hofmeyr "A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.)." <i>PLoS One</i> (2015) http://hdl.handle.net/11427/14845 en_ZA
dc.identifier.vancouvercitation Woodborne S, Hall G, Robertson I, Patrut A, Rouault M, Loader NJ, et al. A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.). PLoS One. 2015; http://hdl.handle.net/11427/14845. en_ZA
dc.identifier.ris TY - Journal Article AU - Woodborne, Stephan AU - Hall, Grant AU - Robertson, Iain AU - Patrut, Adrian AU - Rouault, Mathieu AU - Loader, Neil J AU - Hofmeyr, Michele AB - A proxy rainfall record for northeastern South Africa based on carbon isotope analysis of four baobab ( Adansonia digitata L.) trees shows centennial and decadal scale variability over the last 1,000 years. The record is in good agreement with a 200-year tree ring record from Zimbabwe, and it indicates the existence of a rainfall dipole between the summer and winter rainfall areas of South Africa. The wettest period was c. AD 1075 in the Medieval Warm Period, and the driest periods were c. AD 1635, c. AD 1695 and c. AD1805 during the Little Ice Age. Decadal-scale variability suggests that the rainfall forcing mechanisms are a complex interaction between proximal and distal factors. Periods of higher rainfall are significantly associated with lower sea-surface temperatures in the Agulhas Current core region and a negative Dipole Moment Index in the Indian Ocean. The correlation between rainfall and the El Niño/Southern Oscillation Index is non-static. Wetter conditions are associated with predominantly El Niño conditions over most of the record, but since about AD 1970 this relationship inverted and wet conditions are currently associated with la Nina conditions. The effect of both proximal and distal oceanic influences are insufficient to explain the rainfall regime shift between the Medieval Warm Period and the Little Ice Age, and the evidence suggests that this was the result of a northward shift of the subtropical westerlies rather than a southward shift of the Intertropical Convergence Zone. DA - 2015 DB - OpenUCT DO - 10.1371/journal.pone.0124202 DP - University of Cape Town J1 - PLoS One LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.) TI - A 1000-year carbon isotope rainfall proxy record from South African baobab trees (Adansonia digitata L.) UR - http://hdl.handle.net/11427/14845 ER - en_ZA


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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Except where otherwise noted, this item's license is described as This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.