气候变化领域集成服务门户(CCPortal): Nearshore paleoceanogaphic conditions through the Holocene: Shell carbonate from archaeological sites of the Atacama Desert coast

CCPortal

DOI	10.1016/j.palaeo.2020.110090
	Nearshore paleoceanogaphic conditions through the Holocene: Shell carbonate from archaeological sites of the Atacama Desert coast
	Flores C.; Broitman B.R.
发表日期	2020
ISSN	0031-0182
英文摘要	From the southern coast of Peru to the central-north coast of Chile (18°-31°S) previous evidence suggests that wide variations in sea surface temperature (SST) over the Holocene may be associated with changes in coastal upwelling regimes along the region. Support for spatial contrasts and similarities in oceanographic dynamics comes from earlier work at both extremes of the region. Using a 12 kyr record derived from shell midden archaeological sites around Taltal Chile (25°S), we show that changes in the region are not necessarily consistent with a simple latitudinal gradient. Using δ13C and δ18O isotopic records from archaeological carbonate shells of the keyhole limpet Fissurella maxima we find that cold SST during the Early Holocene was associated with more negative δ13C values in agreement with observations from southern Peru. Warmer waters during the beginning of the Middle Holocene, had positive δ13C values, differentiating them from southern Peru and central-north Chile records. The rest of the Middle Holocene showed a decreasing SST accompanied by negative δ13C values, and after 4000 cal yr BP, the Late Holocene showed a progressive increase in SST and positive δ13C values. Finally, modern carbonate shells of F. maxima indicate a situation not observed throughout the Holocene period: warm SST is associated with negative δ13C values, in line with results on modern shells from southern Peru and modern oceanographic patterns that indicate an intensification of coastal upwelling with events of warm water intrusion. Our results show that the southern coast of the Atacama Desert experienced important fluctuations in SST and upwelling conditions during the Holocene, which may have affected the distribution of nearshore fisheries along the Northern Coast of Chile. © 2020 Elsevier B.V.
英文关键词	Coastal upwelling; Fissurella maxima shell; Isotopic analysis; Sea surface temperature; Shell carbonate; δ18O δ13C
语种	英语
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/150721
作者单位	Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Facultad de Ciencias del Mar, Universidad Católica del Norte, Ossandón 877, Coquimbo, Chile; Departamento de Ciencias, Facultad de Artes Liberales & Bioengineering Innovation Center, Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Viña del Mar, Chile
推荐引用方式 GB/T 7714	Flores C.,Broitman B.R.. Nearshore paleoceanogaphic conditions through the Holocene: Shell carbonate from archaeological sites of the Atacama Desert coast[J],2020.
APA	Flores C.,&Broitman B.R..(2020).Nearshore paleoceanogaphic conditions through the Holocene: Shell carbonate from archaeological sites of the Atacama Desert coast.Palaeogeography, Palaeoclimatology, Palaeoecology.
MLA	Flores C.,et al."Nearshore paleoceanogaphic conditions through the Holocene: Shell carbonate from archaeological sites of the Atacama Desert coast".Palaeogeography, Palaeoclimatology, Palaeoecology (2020).