气候变化领域集成服务门户(CCPortal): Dominant factors controlling glacial and interglacial variations in the treeline elevation in tropical Africa

CCPortal

DOI	10.1073/pnas.0610109104
	Dominant factors controlling glacial and interglacial variations in the treeline elevation in tropical Africa
	Wu H.; Guiot J.; Brewer S.; Guo Z.; Peng C.
发表日期	2007
ISSN	0027-8424
起始页码	9720
结束页码	9724
卷号	104 期号:23
英文摘要	The knowledge of tropical palaeoclimates is crucial for understanding global climate change, because it is a test bench for general circulation models that are ultimately used to predict future global warming. A longstanding issue concerning the last glacial maximum in the tropics is the discrepancy between the decrease in sea-surface temperatures reconstructed from marine proxies and the high-elevation decrease in land temperatures estimated from indicators of treeline elevation. In this study, an improved inverse vegetation modeling approach is used to quantitatively reconstruct palaeoclimate and to estimate the effects of different factors (temperature, precipitation, and atmospheric CO2 concentration) on changes in treeline elevation based on a set of pollen data covering an altitudinal range from 100 to 3,140 m above sea level in Africa. We show that lowering of the African treeline during the last glacial maximum was primarily triggered by regional drying, especially at upper elevations, and was amplified by decreases in atmospheric CO2 concentration and perhaps temperature. This contrasts with scenarios for the Holocene and future climates, in which the increase in treeline elevation will be dominated by temperature. Our results suggest that previous temperature changes inferred from tropical treeline shifts may have been overestimated for low-CO2 glacial periods, because the limiting factors that control changes in treeline elevation differ between glacial and interglacial periods. © 2007 by The National Academy of Sciences of the USA.
英文关键词	Biome model; Biome pollen scores; Palaeoclimatology; Pollen; Vegetation model inversion
语种	英语
scopus关键词	carbon dioxide; Africa; altitude; article; climate change; environmental temperature; glacier; Holocene; model; paleoclimatology; pollen; precipitation; priority journal; sea surface temperature; tree; vegetation history; Africa; Altitude; Atmosphere; Carbon Dioxide; Climate; Models, Theoretical; Pollen; Precipitation; Temperature; Trees; Tropical Climate
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159180
作者单位	Wu, H., State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China, Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Unité Mixte de Recherche 6635, Centre National de la Recherche Scientifique/Université Paul Cézanne, BP 80, 13545 Aix-en-Provence Cedex 4, France, Institut des Sciences de l'Environnement, Département des Sciences Biologiques, Université du Québec À Montreal, Montréal, Que. H3C 3P8, Canada; Guiot, J., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Unité Mixte de Recherche 6635, Centre National de la Recherche Scientifique/Université Paul Cézanne, BP 80, 13545 Aix-en-Provence Cedex 4, France; Brewer, S., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Unité Mixte de Recherche 6635, Centre National de la Recherche Scientifique/Université Paul Cézanne, BP 80, 13545 Aix-en-Provence Cedex 4, France; Guo, Z., State Key...
推荐引用方式 GB/T 7714	Wu H.,Guiot J.,Brewer S.,et al. Dominant factors controlling glacial and interglacial variations in the treeline elevation in tropical Africa[J],2007,104(23).
APA	Wu H.,Guiot J.,Brewer S.,Guo Z.,&Peng C..(2007).Dominant factors controlling glacial and interglacial variations in the treeline elevation in tropical Africa.Proceedings of the National Academy of Sciences of the United States of America,104(23).
MLA	Wu H.,et al."Dominant factors controlling glacial and interglacial variations in the treeline elevation in tropical Africa".Proceedings of the National Academy of Sciences of the United States of America 104.23(2007).