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Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands

E. Gebrehiwot Gebregeorgis, Iain Robertson Orcid Logo, M. Koprowski, L. P. Zhou, P. Gao, A. P. Williams, Z. Eshetu, T. H. G. Wils

International Journal of Biometeorology, Volume: 64, Issue: 5, Pages: 739 - 753

Swansea University Author: Iain Robertson Orcid Logo

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DOI (Published version): 10.1007/s00484-020-01863-7

Abstract

In the Horn of Africa, little is known about temporal changes in hydroclimate owing to the influence of multiple weather systems, the complex terrain, and the sparse instrumental records. Absolutely dated tree-ring records offer the potential to extend our understanding of climate into the pre-instr...

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Published in: International Journal of Biometeorology
ISSN: 0020-7128 1432-1254
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53428
first_indexed 2020-02-04T14:12:58Z
last_indexed 2025-03-12T04:50:58Z
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spelling 2025-03-11T15:30:38.0473330 v2 53428 2020-02-04 Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands ef8912c57e0140e9ecb2a69b7e34467e 0000-0001-7174-4523 Iain Robertson Iain Robertson true false 2020-02-04 BGPS In the Horn of Africa, little is known about temporal changes in hydroclimate owing to the influence of multiple weather systems, the complex terrain, and the sparse instrumental records. Absolutely dated tree-ring records offer the potential to extend our understanding of climate into the pre-instrumental era, but tree-ring studies in this region, and indeed all of tropical Africa, have been rare largely due to lack of an annual climate cycle that reliably produces annual tree-rings. In this study, 40 cores were obtained from 31 Juniperus procera trees growing in the grounds of Ethiopian Orthodox Tewahedo churches in the Gonder region of Ethiopia. The samples were cross-dated using a re-iterative process involving identifying anatomical features from high-resolution images. The tentative ring-width chronologies were revised after the determination of bomb-peak accelerator mass spectrometry radiocarbon dates. Individual series were significantly correlated to the respective master chronologies (r > 0.55; P < 0.05), and expressed population signal values ranged from 0.55 to 0.92. Historical drought years were successfully traced in the chronologies by pointer year analysis. This study confirms that Juniperus procera growing in areas of unimodal precipitation exhibits annual tree-rings and offers the potential as an indirect measure of past climate. Journal Article International Journal of Biometeorology 64 5 739 753 Springer Science and Business Media LLC 0020-7128 1432-1254 Annual tree-rings; Tropical dendrochronology; Radiocarbon dating; Pointer years; The Blue Nile River basin 1 5 2020 2020-05-01 10.1007/s00484-020-01863-7 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee Field sampling and part of laboratory analysis was financially supported by a National Geographic Global Exploration Fund grant GEFNE80-13 (Drought reconstruction in the Horn of Africa). 2025-03-11T15:30:38.0473330 2020-02-04T10:43:46.3984717 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography E. Gebrehiwot Gebregeorgis 1 Iain Robertson 0000-0001-7174-4523 2 M. Koprowski 3 L. P. Zhou 4 P. Gao 5 A. P. Williams 6 Z. Eshetu 7 T. H. G. Wils 8 53428__16632__58297082b46140b786495739d3a89d37.pdf 53428.pdf 2020-02-19T15:30:46.2589243 Output 8221883 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 International License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
spellingShingle Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
Iain Robertson
title_short Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
title_full Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
title_fullStr Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
title_full_unstemmed Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
title_sort Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
author_id_str_mv ef8912c57e0140e9ecb2a69b7e34467e
author_id_fullname_str_mv ef8912c57e0140e9ecb2a69b7e34467e_***_Iain Robertson
author Iain Robertson
author2 E. Gebrehiwot Gebregeorgis
Iain Robertson
M. Koprowski
L. P. Zhou
P. Gao
A. P. Williams
Z. Eshetu
T. H. G. Wils
format Journal article
container_title International Journal of Biometeorology
container_volume 64
container_issue 5
container_start_page 739
publishDate 2020
institution Swansea University
issn 0020-7128
1432-1254
doi_str_mv 10.1007/s00484-020-01863-7
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description In the Horn of Africa, little is known about temporal changes in hydroclimate owing to the influence of multiple weather systems, the complex terrain, and the sparse instrumental records. Absolutely dated tree-ring records offer the potential to extend our understanding of climate into the pre-instrumental era, but tree-ring studies in this region, and indeed all of tropical Africa, have been rare largely due to lack of an annual climate cycle that reliably produces annual tree-rings. In this study, 40 cores were obtained from 31 Juniperus procera trees growing in the grounds of Ethiopian Orthodox Tewahedo churches in the Gonder region of Ethiopia. The samples were cross-dated using a re-iterative process involving identifying anatomical features from high-resolution images. The tentative ring-width chronologies were revised after the determination of bomb-peak accelerator mass spectrometry radiocarbon dates. Individual series were significantly correlated to the respective master chronologies (r > 0.55; P < 0.05), and expressed population signal values ranged from 0.55 to 0.92. Historical drought years were successfully traced in the chronologies by pointer year analysis. This study confirms that Juniperus procera growing in areas of unimodal precipitation exhibits annual tree-rings and offers the potential as an indirect measure of past climate.
published_date 2020-05-01T04:54:42Z
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