气候变化领域集成服务门户(CCPortal): A long record of MIS 7 and MIS 5 climate and environment from a western Mediterranean speleothem (SW Sardinia; Italy)

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DOI	10.1016/j.quascirev.2019.07.023
	A long record of MIS 7 and MIS 5 climate and environment from a western Mediterranean speleothem (SW Sardinia; Italy)
	Columbu A.; Spötl C.; De Waele J.; Yu T.-L.; Shen C.-C.; Gázquez F.
发表日期	2019
ISSN	0277-3791
起始页码	230
结束页码	243
卷号	220
英文摘要	Here we present the first record of Marine Isotope Stage (MIS) 7 from Sardinia, based on a U-Th-dated speleothem from Crovassa Azzurra cave, which also grew during MIS 5. Carbonate precipitation was continuous during MIS 7, while two multi-millennial hiatuses interrupted growth during MIS 5. These hiatuses occurred during times of unstable climate, but local karst-specific conditions are considered to have played an important role as well. δ13C values mostly reflect soil bioproductivity and vegetation density. During less humid periods these values reflect bedrock δ13C values, because of a semi-closed system and/or sulphuric acid-driven bedrock dissolution. δ18O changes were governed by the interplay of rainfall amount and moisture source. Disentangling these two effects was possible by comparing δ13C and δ18O values, whereby both isotopes co-vary during periods when δ18O was dominated by the amount effect. Changes in the relative proportion of Atlantic and Mediterranean moisture sources was the main control on δ18O at times when δ18O was decoupled from δ13C. δ18O variations during MIS 5 are synchronous with Greenland stadials (GS) and interstadials (GI) GS 26, GI 25, GI-GS 22, GI-GS 21. With the exception of GS 22, these climate oscillations did not affect soil bioproductivity, and δ18O mirrors the relative proportion of Atlantic and Mediterranean moisture sources. GS 22 was a prominent arid period in Sardinia, in accordance with other regional palaeoclimate archives. High soil bioproductivity is indicated by δ13C values for MIS 7e and MIS 7c-a; the latter interval was characterized by a 30 kyr-long time span of warm and humid conditions in Sardinia. Soil bioproductivity decreased markedly during MIS 7d and the climate became drier. The latter period, also constrained by δ18O data, lasted significantly shorter in Sardinia than in central Europe. As indicated by changes in δ13C and δ18O relationships, variations in moisture source are also recorded for MIS 7, with Mediterranean-dominated rainfall during MIS 7e and 7c followed by a shift toward Atlantic-dominated rainfall. © 2019 Elsevier Ltd
英文关键词	Caves; Flowstone; Interglacials; Mediterranean; MIS 5; MIS 7; Palaeoclimate; Sardinia; Speleothems; Western Europe
语种	英语
scopus关键词	Caves; Climatology; Glacial geology; Isotopes; Moisture; Rain; Flowstone; Interglacials; Mediterranean; Palaeoclimate; Sardinia; Speleothems; Western Europe; Soils; carbon isotope; cave; glacial-interglacial cycle; interstadial; marine isotope stage; Mediterranean environment; moisture content; oxygen isotope ratio; paleoclimate; precipitation intensity; proxy climate record; speleothem; Arctic; Greenland; Italy; Sardinia; Western Europe
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/151800
作者单位	Department of Biological, Geological and Environmental Sciences, University of Bologna, Via Zamboni 67, Bologna, 40126, Italy; Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan; Research Center for Future Earth, National Taiwan University, Taipei, 10617, Taiwan; Department of Biology and Geology, University of Almeria, La Cañada de San Urbano, Almería, 04120, Spain
推荐引用方式 GB/T 7714	Columbu A.,Spötl C.,De Waele J.,et al. A long record of MIS 7 and MIS 5 climate and environment from a western Mediterranean speleothem (SW Sardinia; Italy)[J],2019,220.
APA	Columbu A.,Spötl C.,De Waele J.,Yu T.-L.,Shen C.-C.,&Gázquez F..(2019).A long record of MIS 7 and MIS 5 climate and environment from a western Mediterranean speleothem (SW Sardinia; Italy).Quaternary Science Reviews,220.
MLA	Columbu A.,et al."A long record of MIS 7 and MIS 5 climate and environment from a western Mediterranean speleothem (SW Sardinia; Italy)".Quaternary Science Reviews 220(2019).