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A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana

Stephan Woodborne, Grant Hall, Connor W. Jones, Neil Loader Orcid Logo, Adrian Patrut, Roxana T. Patrut, Iain Robertson Orcid Logo, Stephan R. Winkler, Christiaan W. Winterbach

Studia Universitatis Babeș-Bolyai Chemia, Volume: 63, Issue: 1, Pages: 109 - 123

Swansea University Authors: Neil Loader Orcid Logo, Iain Robertson Orcid Logo

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Abstract

Climate records along aridity gradients where manifestations of climate change are most profound are important for testing climate models. The Kalahari Transect spans such a gradient, but instrumental records of climate parameters are limited in the sparsely populated region. We analysed the δ13C an...

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Published in: Studia Universitatis Babeș-Bolyai Chemia
ISSN: 12247154 20659520
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39623
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spelling 2018-05-21T10:29:39.5389727 v2 39623 2018-04-29 A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana 8267a62100791965d08df6a7842676e6 0000-0002-6841-1813 Neil Loader Neil Loader true false ef8912c57e0140e9ecb2a69b7e34467e 0000-0001-7174-4523 Iain Robertson Iain Robertson true false 2018-04-29 SGE Climate records along aridity gradients where manifestations of climate change are most profound are important for testing climate models. The Kalahari Transect spans such a gradient, but instrumental records of climate parameters are limited in the sparsely populated region. We analysed the δ13C and δ18O record from a Vachellia erioloba (E.Mey) tree from the southern Kalahari Desert in Botswana to explore its potential as a climate proxy archive. Radiocarbon dates show that the record spans the period 1758-2013 CE. Both the δ13C and δ18O records correlate with local rainfall. The isotope proxies show a weak positive correlation with sea-surface temperature reconstruction from the southwestern Indian Ocean, and a stronger correlation with the El Niño Southern Oscillation index. This appears to contradict previous evidence that higher sea-surface temperatures are associated with reduced summer rainfall over the southern African interior. Instead of eastward shifts in the temperate tropical trough synoptic system during elevated southwestern Indian Ocean temperature anomalies, the evidence supports a westwards shift. The result demonstrates the potential of Vachellia erioloba as a climate proxy archive that may yield past climate variability from the arid regions of southern Africa. Journal Article Studia Universitatis Babeș-Bolyai Chemia 63 1 109 123 12247154 20659520 28 4 2018 2018-04-28 10.24193/subbchem.2018.1.09 http://chem.ubbcluj.ro/~studiachemia/chemia2018_1.html Open Access Article COLLEGE NANME Geography COLLEGE CODE SGE Swansea University 2018-05-21T10:29:39.5389727 2018-04-29T14:09:33.3937203 College of Science Geography Stephan Woodborne 1 Grant Hall 2 Connor W. Jones 3 Neil Loader 0000-0002-6841-1813 4 Adrian Patrut 5 Roxana T. Patrut 6 Iain Robertson 0000-0001-7174-4523 7 Stephan R. Winkler 8 Christiaan W. Winterbach 9 0039623-09052018114122.pdf 39623.pdf 2018-05-09T11:41:22.3200000 Output 405327 application/pdf Version of Record true 2018-05-09T00:00:00.0000000 Studia Universitatis Babes-Bolyai Seria Chemia is an Open Access Journal. true eng
title A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
spellingShingle A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
Neil Loader
Iain Robertson
title_short A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
title_full A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
title_fullStr A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
title_full_unstemmed A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
title_sort A 250-Year Isotopic Proxy Rainfall Record from Southern Botswana
author_id_str_mv 8267a62100791965d08df6a7842676e6
ef8912c57e0140e9ecb2a69b7e34467e
author_id_fullname_str_mv 8267a62100791965d08df6a7842676e6_***_Neil Loader
ef8912c57e0140e9ecb2a69b7e34467e_***_Iain Robertson
author Neil Loader
Iain Robertson
author2 Stephan Woodborne
Grant Hall
Connor W. Jones
Neil Loader
Adrian Patrut
Roxana T. Patrut
Iain Robertson
Stephan R. Winkler
Christiaan W. Winterbach
format Journal article
container_title Studia Universitatis Babeș-Bolyai Chemia
container_volume 63
container_issue 1
container_start_page 109
publishDate 2018
institution Swansea University
issn 12247154
20659520
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url http://chem.ubbcluj.ro/~studiachemia/chemia2018_1.html
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description Climate records along aridity gradients where manifestations of climate change are most profound are important for testing climate models. The Kalahari Transect spans such a gradient, but instrumental records of climate parameters are limited in the sparsely populated region. We analysed the δ13C and δ18O record from a Vachellia erioloba (E.Mey) tree from the southern Kalahari Desert in Botswana to explore its potential as a climate proxy archive. Radiocarbon dates show that the record spans the period 1758-2013 CE. Both the δ13C and δ18O records correlate with local rainfall. The isotope proxies show a weak positive correlation with sea-surface temperature reconstruction from the southwestern Indian Ocean, and a stronger correlation with the El Niño Southern Oscillation index. This appears to contradict previous evidence that higher sea-surface temperatures are associated with reduced summer rainfall over the southern African interior. Instead of eastward shifts in the temperate tropical trough synoptic system during elevated southwestern Indian Ocean temperature anomalies, the evidence supports a westwards shift. The result demonstrates the potential of Vachellia erioloba as a climate proxy archive that may yield past climate variability from the arid regions of southern Africa.
published_date 2018-04-28T03:53:46Z
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