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Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands
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...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7220890/ https://www.ncbi.nlm.nih.gov/pubmed/32008098 http://dx.doi.org/10.1007/s00484-020-01863-7 |
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author | Gebregeorgis, E. Gebrehiwot Robertson, I. Koprowski, M. Zhou, L. P. Gao, P. Williams, A. P. Eshetu, Z. Wils, T. H. G. |
author_facet | Gebregeorgis, E. Gebrehiwot Robertson, I. Koprowski, M. Zhou, L. P. Gao, P. Williams, A. P. Eshetu, Z. Wils, T. H. G. |
author_sort | Gebregeorgis, E. Gebrehiwot |
collection | PubMed |
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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s00484-020-01863-7) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-7220890 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-72208902020-05-14 Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands Gebregeorgis, E. Gebrehiwot Robertson, I. Koprowski, M. Zhou, L. P. Gao, P. Williams, A. P. Eshetu, Z. Wils, T. H. G. Int J Biometeorol Original Paper 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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s00484-020-01863-7) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2020-02-01 2020 /pmc/articles/PMC7220890/ /pubmed/32008098 http://dx.doi.org/10.1007/s00484-020-01863-7 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Original Paper Gebregeorgis, E. Gebrehiwot Robertson, I. Koprowski, M. Zhou, L. P. Gao, P. Williams, A. P. Eshetu, Z. Wils, T. H. G. Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands |
title | 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_short | 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 |
topic | Original Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7220890/ https://www.ncbi.nlm.nih.gov/pubmed/32008098 http://dx.doi.org/10.1007/s00484-020-01863-7 |
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