气候变化领域集成服务门户(CCPortal): Coupled stalagmite – Alluvial fan response to the 8.2 ka event and early Holocene palaeoclimate change in Greece

CCPortal

DOI	10.1016/j.palaeo.2019.109252
	Coupled stalagmite – Alluvial fan response to the 8.2 ka event and early Holocene palaeoclimate change in Greece
	Peckover E.N.; Andrews J.E.; Leeder M.R.; Rowe P.J.; Marca A.; Sahy D.; Noble S.; Gawthorpe R.
发表日期	2019
ISSN	0031-0182
卷号	532
英文摘要	We explore the expression of early Holocene climatic change in the terrestrial Mediterranean of southern Greece. A regional palaeoclimate record from stable isotope and trace element geochemical proxies in an early Holocene (~12.4 ka to 6.7 ka) stalagmite is compared to the timing of palaeosol (entisol) development on an early Holocene alluvial fan located <100 km from the stalagmite site. Radiocarbon dated entisol development records fan abandonment surfaces, which can be coupled to the stalagmite climate signal. Variations in δ13C best record the main elements of palaeoclimatic change, more negative values indicating soil carbon input to karst groundwater under wetter conditions. The wettest conditions begin around 10.3 ka, coincident with the start of sapropel 1 deposition in the eastern Mediterranean. The widely documented northern hemisphere ‘8.2 ka event’ of cooler and drier conditions has a muted δ18O climatic signal in common with other stalagmite climate records from the wider Mediterranean. However, less negative δ13C values do record a period of episodic dryness between ~8.8 and ending at 8.2 ka. Wetter conditions re-established after 8.1 ka to the end of the record. The oldest alluvial fan entisols were developing by ~9.5 ka, and a prominent rubified entisol developed ~8.3 to 8.4 ka, indicating pedogenesis within dating error of the 8.2 ka event. The speleothem record of episodic dryness between ~8.8 and 8.2 ka, combined with other regional proxies, is consistent with the notion that precipitation patterns in Greece may have changed from predominantly winter frontal to summer convective during this period. Palaeosol formation on the alluvial fan may have been an allocyclic response to this change. It is plausible that fan-channel incision, driven by temporary development of a ‘flashier’ summer rainfall regime, isolated large areas of the fan surface allowing onset of prolonged pedogenesis there. © 2019
英文关键词	8.2 ka event; Alluvial fan; Greece; Holocene; Palaeoclimate; Stalagmite
语种	英语
scopus关键词	alluvial fan; groundwater; Holocene; karst hydrology; paleoclimate; paleosol; pedogenesis; precipitation intensity; sapropel; soil carbon; speleothem; stable isotope; stalagmite; trace element
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/150857
作者单位	School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Geochronology and Tracers Facility, NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, United Kingdom; Basin and Reservoir Studies Group, Department of Earth Science, University of Bergen, Allegaten 41, Bergen, 5020, Norway
推荐引用方式 GB/T 7714	Peckover E.N.,Andrews J.E.,Leeder M.R.,等. Coupled stalagmite – Alluvial fan response to the 8.2 ka event and early Holocene palaeoclimate change in Greece[J],2019,532.
APA	Peckover E.N..,Andrews J.E..,Leeder M.R..,Rowe P.J..,Marca A..,...&Gawthorpe R..(2019).Coupled stalagmite – Alluvial fan response to the 8.2 ka event and early Holocene palaeoclimate change in Greece.Palaeogeography, Palaeoclimatology, Palaeoecology,532.
MLA	Peckover E.N.,et al."Coupled stalagmite – Alluvial fan response to the 8.2 ka event and early Holocene palaeoclimate change in Greece".Palaeogeography, Palaeoclimatology, Palaeoecology 532(2019).