dc.contributor.author |
Woodborne, Stephan M.
|
|
dc.contributor.author |
Gandiwa, Patience
|
|
dc.contributor.author |
Hall, Grant
|
|
dc.contributor.author |
Patrut, Adrian
|
|
dc.contributor.author |
Finch, Jemma
|
|
dc.date.accessioned |
2016-09-21T05:18:26Z |
|
dc.date.available |
2016-09-21T05:18:26Z |
|
dc.date.issued |
2016-07-18 |
|
dc.description.abstract |
Carbon isotope analysis of four baobab (Adansonia digitata L.) trees from the Pafuri region
of South Africa yielded a 1000-year proxy rainfall record. The Pafuri record age model was
based on 17 radiocarbon dates, cross correlation of the climate record, and ring structures
that were presumed to be annual for two of the trees. Here we present the analysis of five
additional baobabs from the Mapungubwe region, approximately 200km west of Pafuri. The
Mapungubwe chronology demonstrates that ring structures are not necessarily annually
formed, and accordingly the Pafuri chronology is revised. Changes in intrinsic water-use
efficiency indicate an active response by the trees to elevated atmospheric CO2, but this
has little effect on the environmental signal. The revised Pafuri record, and the new Mapungubwe
record correlate significantly with local rainfall. Both records confirm that the Medieval
Warm Period was substantially wetter than present, and the Little Ice Age was the driest
period in the last 1000 years. Although Mapungubwe is generally drier than Pafuri, both
regions experience elevated rainfall peaking between AD 1570 and AD 1620 after which
dry conditions persist in the Mapungubwe area until about AD 1840. Differences between
the two records correlate with Agulhas Current sea-surface temperature variations suggesting
east/west displacement of the temperate tropical trough system as an underlying mechanism.
The Pafuri and Mapungubwe records are combined to provide a regional climate
proxy record for the northern summer rainfall area of southern Africa. |
en_ZA |
dc.description.department |
Mammal Research Institute |
en_ZA |
dc.description.librarian |
am2016 |
en_ZA |
dc.description.sponsorship |
The radiocarbon dating of Luna and
Shroda trees was funded by the Romanian Ministry of
National Education CNCS/UEFISCDI under grant
PN-II-ID-PCE-2013-76. Radiocarbon analyses on the
LKA, LKB and MPC baobabs and fieldwork costs
were supported wholly by the African Origins Platform
of the National Research Foundation of South Africa
(Grant Number 82596). Isotopic analyses were
supported wholly by the National Research
Foundation of South Africa (Grant Number 91042). |
en_ZA |
dc.description.uri |
http://www.plosone.org |
en_ZA |
dc.description.uri |
https://www.ncdc.noaa.gov/paleo/study/19320 |
en_ZA |
dc.identifier.citation |
Woodborne S, Gandiwa P, Hall G, Patrut A,
Finch J (2016) A Regional Stable Carbon Isotope
Dendro-Climatology from the South African Summer
Rainfall Area. PLoS ONE 11(7): e0159361.
DOI: 10.1371/journal.pone.0159361. |
en_ZA |
dc.identifier.issn |
1932-6203 |
|
dc.identifier.other |
10.1371/journal.pone.0159361 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/56765 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Public Library of Science |
en_ZA |
dc.rights |
© 2016 Woodborne et al. This is an open
access article distributed under the terms of the
Creative Commons Attribution License. |
en_ZA |
dc.subject |
Pafuri chronology |
en_ZA |
dc.subject |
Mapungubwe |
en_ZA |
dc.subject |
Rainfall |
en_ZA |
dc.subject |
Climate |
en_ZA |
dc.title |
A regional stable carbon isotope dendro-climatology from the South African summer rainfall area |
en_ZA |
dc.type |
Article |
en_ZA |