气候变化领域集成服务门户(CCPortal): Late Quaternary paleoenvironmental changes in tropical eastern Africa revealed by multi–proxy records from the Cherangani Hills; Kenya

CCPortal

DOI	10.1016/j.quascirev.2019.105907
	Late Quaternary paleoenvironmental changes in tropical eastern Africa revealed by multi–proxy records from the Cherangani Hills; Kenya
	Opiyo B.; Gebregiorgis D.; Cheruiyot V.C.; Deocampo D.M.; Kiage L.M.
发表日期	2019
ISSN	0277-3791
卷号	222
英文摘要	There is paucity in the proxy records available for the reconstruction of vegetation and climate histories of tropical eastern Africa, especially north of the equator. Here, we present a new paleoenvironmental record based on a 3.5-m sediment core from the Kapkanyar mire, Cherangani Hills, Kenya. Using analyses of pollen, microscopic charcoal, and loss-on-ignition data, we examine the vegetation and climate history of tropical eastern Africa over the past ∼23 Kyrs. Our findings show that high levels of dry montane forest vegetation and high frequencies of Poaceae and Chenopodiaceae/Amaranthaceae (Cheno/Am) pollen types dominate the LGM period (∼23.5–18 Kyrs). The last deglaciation (∼18–12 Kyrs) is marked by a decrease in Afromontane vegetation such as Ulmaceae, Combretaceae, and Podocarpus and resurgence in Cheno/Am pollen with a minimal representation of Olea pollen. The presence of Combretaceae pollen alongside increased percentages of Cheno/Am pollen indicates that cold and dry climate likely prevailed during the last deglaciation period. The record shows that the eastern African region was generally wet over most of the Holocene, albeit with increased frequency of drought episodes. The first imprints of anthropogenic activities in the record appear between ∼4 and 3.5 Kyrs. © 2019 Elsevier Ltd
语种	英语
scopus关键词	Charcoal; Forestry; Vegetation; Anthropogenic activity; Climate history; High frequency HF; Last deglaciation; Loss on ignition; Minimal representation; Montane forests; Paleoenvironmental change; Tropics; human activity; last deglaciation; montane forest; paleoclimate; paleoenvironment; pollen; proxy climate record; Quaternary; sediment core; tropical environment; vegetation history; East Africa; Kenya; Combretaceae; Poaceae; Podocarpus; Ulmaceae
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151755
作者单位	Department of Geosciences, Georgia State University, Atlanta, GA 30302, United States
推荐引用方式 GB/T 7714	Opiyo B.,Gebregiorgis D.,Cheruiyot V.C.,等. Late Quaternary paleoenvironmental changes in tropical eastern Africa revealed by multi–proxy records from the Cherangani Hills; Kenya[J],2019,222.
APA	Opiyo B.,Gebregiorgis D.,Cheruiyot V.C.,Deocampo D.M.,&Kiage L.M..(2019).Late Quaternary paleoenvironmental changes in tropical eastern Africa revealed by multi–proxy records from the Cherangani Hills; Kenya.Quaternary Science Reviews,222.
MLA	Opiyo B.,et al."Late Quaternary paleoenvironmental changes in tropical eastern Africa revealed by multi–proxy records from the Cherangani Hills; Kenya".Quaternary Science Reviews 222(2019).