A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana

Patrut, Roxana T.; Patrut, Adrian; Hall, Grant; Winterbach, Christiaan W.; Robertson, Iain; Ratiu, Ileana Andreea; Bocos-Bintintan, Victor; Rakosy, Laszlo; Woodborne, Stephan

doi:10.3390/f14091917

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A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana

Roxana T. Patrut, Adrian Patrut

, Grant Hall

, Christiaan W. Winterbach, Iain Robertson

, Ileana Andreea Ratiu

, Victor Bocos-Bintintan

, Laszlo Rakosy

, Stephan Woodborne

Forests, Volume: 14, Issue: 9, Start page: 1917

Swansea University Author: Iain Robertson

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DOI (Published version): 10.3390/f14091917

Abstract

A high-resolution climate archive was reconstructed based on carbon isotope analysis and radiocarbon dating of the Chapman baobab in northeastern Botswana. The Chapman baobab, which exhibited an open ring-shaped structure composed of six stems, collapsed in January 2016 during an intense El Niño eve...

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Published in:	Forests
ISSN:	1999-4907
Published:	MDPI AG 2023
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa64588
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Two samples belonging to the oldest stems were investigated in order to obtain a proxy rainfall record, which provides insight into the precipitation regime over the last millennium, evincing centennial and decadal scale variability. The results indicate that the Medieval Warm Period was marked by relatively stable precipitation, whereas rainfall variability and drought frequency increased during the Little Ice Age. The investigated area has experienced both wetter and drier conditions in the past. The wettest conditions of the last millennium were registered before 1450 while the driest period occurred in 1835. For southern Africa, inter-annual rainfall variability is mainly associated with sea surface temperatures in the Agulhas Current core region, which determine the east–west displacement of tropical temperate troughs. Previous studies suggested that positive sea surface temperature anomalies in the Mozambique Channel led to an eastward movement of the troughs but the Chapman record demonstrates a westward displacement in the past, causing drought in northeastern South Africa and wetter conditions in the central part of southern Africa. The positive rainfall correlation with SST anomalies reversed after 1900, causing a gradual decrease in precipitation and confirming the current aridity trend for Botswana. 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spelling	v2 64588 2023-09-21 A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana ef8912c57e0140e9ecb2a69b7e34467e 0000-0001-7174-4523 Iain Robertson Iain Robertson true false 2023-09-21 SGE A high-resolution climate archive was reconstructed based on carbon isotope analysis and radiocarbon dating of the Chapman baobab in northeastern Botswana. The Chapman baobab, which exhibited an open ring-shaped structure composed of six stems, collapsed in January 2016 during an intense El Niño event. Two samples belonging to the oldest stems were investigated in order to obtain a proxy rainfall record, which provides insight into the precipitation regime over the last millennium, evincing centennial and decadal scale variability. The results indicate that the Medieval Warm Period was marked by relatively stable precipitation, whereas rainfall variability and drought frequency increased during the Little Ice Age. The investigated area has experienced both wetter and drier conditions in the past. The wettest conditions of the last millennium were registered before 1450 while the driest period occurred in 1835. For southern Africa, inter-annual rainfall variability is mainly associated with sea surface temperatures in the Agulhas Current core region, which determine the east–west displacement of tropical temperate troughs. Previous studies suggested that positive sea surface temperature anomalies in the Mozambique Channel led to an eastward movement of the troughs but the Chapman record demonstrates a westward displacement in the past, causing drought in northeastern South Africa and wetter conditions in the central part of southern Africa. The positive rainfall correlation with SST anomalies reversed after 1900, causing a gradual decrease in precipitation and confirming the current aridity trend for Botswana. The results contribute to a better understanding of the past climate of southern Africa for which paleoclimate reconstructions remain scarce. Journal Article Forests 14 9 1917 MDPI AG 1999-4907 African baobab, paleoclimate reconstruction, radiocarbon dating, stable isotope analysis, proxy rainfall record, Botswana 20 9 2023 2023-09-20 10.3390/f14091917 http://dx.doi.org/10.3390/f14091917 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University Another institution paid the OA fee This research was funded by the Romanian Ministry of Research CNCS-UEFISCDI under grant PN-III-P4-ID-PCE-201620-2567, No. 145/2021. 2023-10-18T15:41:04.0505762 2023-09-21T13:14:17.8150277 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Roxana T. Patrut 1 Adrian Patrut 0000-0002-9862-6735 2 Grant Hall 0000-0002-2164-4900 3 Christiaan W. Winterbach 4 Iain Robertson 0000-0001-7174-4523 5 Ileana Andreea Ratiu 0000-0003-2615-684x 6 Victor Bocos-Bintintan 0000-0003-0836-1049 7 Laszlo Rakosy 0000-0002-7793-6996 8 Stephan Woodborne 0000-0001-8573-8626 9 64588__28733__d374f3540e204bbfa13bf5f52ebc02ad.pdf 64588.pdf 2023-10-09T15:54:41.3195809 Output 3607333 application/pdf Version of Record true © 2023 by the authors. Licensee MDPI, Basel, Switzerland. Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0). true eng http://creativecommons.org/licenses/by/4.0/
title	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
spellingShingle	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana Iain Robertson
title_short	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
title_full	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
title_fullStr	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
title_full_unstemmed	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
title_sort	A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana
author_id_str_mv	ef8912c57e0140e9ecb2a69b7e34467e
author_id_fullname_str_mv	ef8912c57e0140e9ecb2a69b7e34467e_***_Iain Robertson
author	Iain Robertson
author2	Roxana T. Patrut Adrian Patrut Grant Hall Christiaan W. Winterbach Iain Robertson Ileana Andreea Ratiu Victor Bocos-Bintintan Laszlo Rakosy Stephan Woodborne
format	Journal article
container_title	Forests
container_volume	14
container_issue	9
container_start_page	1917
publishDate	2023
institution	Swansea University
issn	1999-4907
doi_str_mv	10.3390/f14091917
publisher	MDPI AG
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
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department_str	School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
url	http://dx.doi.org/10.3390/f14091917
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description	A high-resolution climate archive was reconstructed based on carbon isotope analysis and radiocarbon dating of the Chapman baobab in northeastern Botswana. The Chapman baobab, which exhibited an open ring-shaped structure composed of six stems, collapsed in January 2016 during an intense El Niño event. Two samples belonging to the oldest stems were investigated in order to obtain a proxy rainfall record, which provides insight into the precipitation regime over the last millennium, evincing centennial and decadal scale variability. The results indicate that the Medieval Warm Period was marked by relatively stable precipitation, whereas rainfall variability and drought frequency increased during the Little Ice Age. The investigated area has experienced both wetter and drier conditions in the past. The wettest conditions of the last millennium were registered before 1450 while the driest period occurred in 1835. For southern Africa, inter-annual rainfall variability is mainly associated with sea surface temperatures in the Agulhas Current core region, which determine the east–west displacement of tropical temperate troughs. Previous studies suggested that positive sea surface temperature anomalies in the Mozambique Channel led to an eastward movement of the troughs but the Chapman record demonstrates a westward displacement in the past, causing drought in northeastern South Africa and wetter conditions in the central part of southern Africa. The positive rainfall correlation with SST anomalies reversed after 1900, causing a gradual decrease in precipitation and confirming the current aridity trend for Botswana. The results contribute to a better understanding of the past climate of southern Africa for which paleoclimate reconstructions remain scarce.
published_date	2023-09-20T15:41:05Z
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A 900-Year Isotopic Proxy Rainfall Record from Northeastern Botswana

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