气候变化领域集成服务门户(CCPortal): Holocene hydroclimate and environmental change inferred from a high-resolution multi-proxy record from Lago Ditkebi; Chirripó National Park; Costa Rica

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DOI	10.1016/j.palaeo.2019.01.004
	Holocene hydroclimate and environmental change inferred from a high-resolution multi-proxy record from Lago Ditkebi; Chirripó National Park; Costa Rica
	Wu J.; Porinchu D.F.; Campbell N.L.; Mordecai T.M.; Alden E.C.
发表日期	2019
ISSN	0031-0182
起始页码	172
结束页码	186
卷号	518
英文摘要	Multi-proxy analysis of a sediment core recovered from Lago Ditkebi in Chirripó National Park, Costa Rica, was undertaken to develop a multi-decadal to sub-centennial-scale reconstruction of Holocene hydroclimate and environmental change for the region. Analyses of sub-fossil chironomid assemblages, macroscopic charcoal, and bulk sediment geochemistry suggest that the glacial highlands in Chirripó National Park experienced notable hydroclimate variability, periodical burning by wildfires and climate-related vegetation change during the last ~8100 years. A single chironomid taxon, Procladius, most commonly associated with cold glacial lakes in Costa Rica, dominates the Holocene sub-fossil chironomid assemblage in Lago Ditkebi. Inferred from the proxy records, the interval between ~8100 and 5270 cal yr BP at the glacial highlands was relatively cold and dry with low effective moisture and limited fire activity. Cool and dry conditions were also observed between ~2820 cal yr BP and present but co-occurred with more frequent, low-severity fires. The highest fire frequency occurred between ~3300 and 1600 cal yr BP. The shifts in the chironomid assemblage and the low δ 13 C values detected between ~5270 and 2820 cal yr BP suggest a warm and wet climate and a decrease in abundance of Muhlenbergia, a C 4 grass during that time. Concurrent maxima in C/N, charcoal accumulation and the abundance of thermophilous chironomid taxon, Polypedilum N type, at ~5200 cal yr BP are indicative of an abrupt climate change event that was characterized by rapid warming, quickly increased effective moisture and intense wildfires in the glacial highlands of Costa Rica. © 2019 Elsevier B.V.
英文关键词	5200 cal yr BP event; Abrupt climate change; Charcoal; Chironomids; Fire history; Sediment geochemistry
语种	英语
scopus关键词	abundance; charcoal; climate change; environmental change; fire history; fossil assemblage; geochemistry; grass; Holocene; insect; national park; proxy climate record; reconstruction; sediment core; wildfire; Costa Rica; Chironomidae; Muhlenbergia; Polypedilum; Procladius
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151060
作者单位	Department of Geography, The University of Georgia, Athens, GA 30605, United States
推荐引用方式 GB/T 7714	Wu J.,Porinchu D.F.,Campbell N.L.,et al. Holocene hydroclimate and environmental change inferred from a high-resolution multi-proxy record from Lago Ditkebi; Chirripó National Park; Costa Rica[J],2019,518.
APA	Wu J.,Porinchu D.F.,Campbell N.L.,Mordecai T.M.,&Alden E.C..(2019).Holocene hydroclimate and environmental change inferred from a high-resolution multi-proxy record from Lago Ditkebi; Chirripó National Park; Costa Rica.Palaeogeography, Palaeoclimatology, Palaeoecology,518.
MLA	Wu J.,et al."Holocene hydroclimate and environmental change inferred from a high-resolution multi-proxy record from Lago Ditkebi; Chirripó National Park; Costa Rica".Palaeogeography, Palaeoclimatology, Palaeoecology 518(2019).