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• W2004865302 abstract "Research Article| December 01, 2011 Seasonality in equatorial climate over the past 25 k.y. revealed by oxygen isotope records from Mount Kilimanjaro Philip A. Barker; Philip A. Barker * 1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK *E-mail: p.barker@lancs.ac.uk. Search for other works by this author on: GSW Google Scholar Elizabeth R. Hurrell; Elizabeth R. Hurrell 1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK Search for other works by this author on: GSW Google Scholar Melanie J. Leng; Melanie J. Leng 2NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Search for other works by this author on: GSW Google Scholar Christian Wolff; Christian Wolff 3Helmholtz-Centre Potsdam, GFZ German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Development Telegrafenberg, C 320, D-14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Christine Cocquyt; Christine Cocquyt 4National Botanic Garden of Belgium, Domein van Bouchout, 1860 Meise, Belgium5Limnology Unit, Department of Biology, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium Search for other works by this author on: GSW Google Scholar Hilary J. Sloane; Hilary J. Sloane 2NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Search for other works by this author on: GSW Google Scholar Dirk Verschuren Dirk Verschuren 5Limnology Unit, Department of Biology, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium Search for other works by this author on: GSW Google Scholar Author and Article Information Philip A. Barker * 1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK Elizabeth R. Hurrell 1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK Melanie J. Leng 2NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Christian Wolff 3Helmholtz-Centre Potsdam, GFZ German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Development Telegrafenberg, C 320, D-14473 Potsdam, Germany Christine Cocquyt 4National Botanic Garden of Belgium, Domein van Bouchout, 1860 Meise, Belgium5Limnology Unit, Department of Biology, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium Hilary J. Sloane 2NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Dirk Verschuren 5Limnology Unit, Department of Biology, Ghent University, Ledeganckstraat 35, 9000 Ghent, Belgium *E-mail: p.barker@lancs.ac.uk. Publisher: Geological Society of America Received: 04 May 2011 Revision Received: 20 Jun 2011 Accepted: 27 Jun 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (12): 1111–1114. https://doi.org/10.1130/G32419.1 Article history Received: 04 May 2011 Revision Received: 20 Jun 2011 Accepted: 27 Jun 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Philip A. Barker, Elizabeth R. Hurrell, Melanie J. Leng, Christian Wolff, Christine Cocquyt, Hilary J. Sloane, Dirk Verschuren; Seasonality in equatorial climate over the past 25 k.y. revealed by oxygen isotope records from Mount Kilimanjaro. Geology 2011;; 39 (12): 1111–1114. doi: https://doi.org/10.1130/G32419.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Multiproxy analysis of a well-dated 25 ka lake sediment sequence from Lake Challa, on the eastern flank of Mount Kilimanjaro (East Africa), reveals the climatic controls that govern both the lake's paleohydrology and the climate-proxy record contained in the mountain's receding ice cap. The oxygen isotope record extracted from diatom silica (δ18Odiatom) in Lake Challa sediments captured dry conditions during the last glacial period and a wet late-glacial transition to the Holocene interrupted by Younger Dryas drought. Further, it faithfully traced gradual weakening of the southeastern monsoon during the Holocene. Overall, δ18Odiatom matches the branched isoprenoid tetraether (BIT) index of rainfall-induced soil runoff, except during 25–22 ka and the past 5 k.y. when insolation forcing due to orbital precession enhanced the northeastern monsoon. This pattern arises because during these two periods, a weakened southeastern monsoon reduced the amount of rainfall during the long rainy season and enhanced the opposing effect of evaporation intensity and/or length of the austral winter dry season. Importantly, our lake-based reconstruction of moisture-balance seasonality in equatorial East Africa also helps us understand the oxygen isotope record contained in Mount Kilimanjaro ice. Negative correlation between ice core δ18O and Lake Challa δ18Odiatom implies that moisture balance is not the primary climate control on the long-term trend in ice core δ18O. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2004865302 title "Seasonality in equatorial climate over the past 25 k.y. revealed by oxygen isotope records from Mount Kilimanjaro" @default.
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