@article{0e2531dded424a51bc7d23cb95ae70a6,
title = "Crossdating Juniperus procera from North Gondar, Ethiopia",
abstract = "The application of dendrochronology in (sub)tropical regions has been limited by the difficulty in finding trees with distinct annual rings that can be crossdated. Here, we report successful crossdating of Juniperus procera trees from North Gondar, Ethiopia. The trees form annual rings in response to a unimodal rainfall regime. The selection of mesic locations ensured that the trees did not respond to intra-seasonal weather anomalies. Crossdating was achieved by comparison of the wood anatomy directly on the surface of the core samples and purpose-adapted skeleton plotting. Wood-anatomical anomalies, such as false and indistinct rings, were regarded as potentially replicated features and used in crossdating. COFECHA yielded site-specific mean series inter-correlations between 0.52 and 0.59. AMS radiocarbon dating during the bomb era indicated that dating uncertainty is ±1 year.",
keywords = "AMS radiocarbon dating, Ring formation, Sub-Saharan Africa, Tree rings, Tropical dendrochronology, Wood anatomy",
author = "Wils, {Tommy H.G.} and Iain Robertson and Zewdu Eshetu and Ramzi Touchan and Ute Sass-Klaassen and Marcin Koprowski",
note = "Funding Information: Acknowledgments The work was funded by a Swansea University studentship and co-funded by the Royal Geographical Society, the Dudley Stamp Memorial Trust (Royal Society) and the Quaternary Research Association. Additional support was obtained from the Association for Tree-ring Research, the University of Arizona, the European Union funded Millennium project (017008-2), the UK Natural Environment Research Council (NE/B501504), Nicolaus Copernicus University and the International Incoming Short Visits programme of the Royal Society. Iain Robertson was supported by the Climate Change Consortium of Wales (C3W). Ute Sass-Klaassen was supported by the Netherlands Organisation for Scientific Research (MEERVOUD grant, 83605030). The Forestry Research Centre (FRC) of the Ethiopian Institute of Agricultural Research (EIAR) in Addis Ababa provided vehicle and other logistic support. The Ethiopian Orthodox Church, Gondar Tourist Office, and Amhara, North Gondar, Debark, Dabat and Gondar governmental offices for agriculture and rural development are acknowledged for support and kind permission to work at the field sites. The National Meteorological Agency (NMA) of Ethiopia (Addis Ababa) is acknowledged for provision of meteorological data. We would like to thank Dr Alemu Gezahegn and Mr Negash Mammo (both FRC directors) for dedicated support, Mr Tesfaye Ayalew for excellent driving and help at the field sites, and Mr Kibruyesfa Sisay and Mr Yeshiber Dagnew for help in the field. We also would like to thank Mrs Nicola Jones and Ms Anna Ratcliffe for drawing maps, Dr Declan Conway and Prof. Keith Briffa (both University of East Anglia) for advice, help and support, and Mgr Hurkmans (Bishop of {\textquoteleft}s-Hertogenbosch, The Netherlands) for writing a letter of recommendation to the authorities of the Ethiopian Orthodox Church.",
year = "2011",
month = feb,
doi = "10.1007/s00468-010-0475-0",
language = "English (US)",
volume = "25",
pages = "71--82",
journal = "Trees - Structure and Function",
issn = "0931-1890",
publisher = "Springer Science and Business Media Deutschland GmbH",
number = "1",
}