globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.07.038
论文题名:
Changes in biological productivity and ocean-climatic fluctuations during the last ~1.5kyr in the Humboldt ecosystem off northern Chile (27°S): A multiproxy approach
作者: Castillo A.; Valdés J.; Sifeddine A.; Reyss J.-L.; Bouloubassi I.; Ortlieb L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Benthic foraminifera ; Late Holocene ; Northern Chile ; Oxygen Minimum Zone intensity
英文摘要: A sedimentary box core (BIAC072014) collected in a coastal environment in the Humboldt Current Ecosystem (HCE, Inglesa Bay, ~. 27°S, northern Chile) was used to reconstruct the changes in biological productivity and ocean-climate fluctuations during the last ~. 1.5. kyr via geochemical, mineralogical and micropaleontological analyses. From ~. 510. CE to ~. 930. CE, "El Niño-like" conditions prevailed, while during the Medieval Climate Anomaly (MCA, ~. 950. CE to ~. 1450. CE), "La Niña-like" conditions predominated. This pattern might have resulted from weakening/strengthening of the Walker cell, contraction/expansion of the South Pacific Sub-tropical High (SPSH) and a predominance of warm/cold phases of the Pacific Decadal Oscillation (PDO). Between ~. 1820. CE and the present, Inglesa Bay experienced a reduction in the Oxygen Minimum Zone (OMZ) intensity and biological productivity, an increase in the detritic input and a decrease in sea surface temperature (SST). Despite the regional intensification and secular cooling (~. 14°S and ~. 27°S) of coastal upwelling, the similarity between the reduction in biological productivity and OMZ intensity in this region and that in the central zone of Chile (~. 36°S) suggests that Inglesa Bay acts a transition zone in relation to the oceanographic behaviour of the HCE. The reduction in the OMZ intensity and biological productivity during the last ~. 200. years could be explained by greater subsurface ventilation in intermediate depths due to more northward displacement of the subduction region of the Eastern South Pacific Intermediate Water (ESPIW) near ~. 30°S in response to the strengthening of the circulation of the Subtropical Gyre. The coastal cooling observed in the northern section of HCE during the current Warm Period suggests that it is not possible to demonstrate that El Niño-like conditions promoted the reduction in biological productivity and OMZ intensity in Inglesa Bay. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68080
Appears in Collections:过去全球变化的重建

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作者单位: Doctorado en Ciencias Aplicadas Mención Sistemas Marinos Costeros, Facultad de Ciencias del Mar y de Recursos Biológicos, Universidad de Antofagasta, Casilla 170, Chile; Laboratorio de Sedimentología y Paleoambientes, Instituto Alexander von Humboldt, Facultad de Ciencias del Mar y de Recursos Biológicos, Universidad de Antofagasta, Casilla 170, Chile; LMI PALEOTRACES (IRD-France, UA-Chile, UFF-Brazil, UPCH-Peru); Departamento de Geoquímica, Universidade Federal Fluminense, Niteroi, RJ, Brazil; IRD-Sorbonne Universités (UPMC, CNRS-MNHN), LOCEAN, IRD France-Nord, Bondy, France; Laboratoire des Sciences du Climat et de l'Environnement, CNRS/Commissariat á l'Energie Atomique, Gif-sur-Yvette, France

Recommended Citation:
Castillo A.,Valdés J.,Sifeddine A.,et al. Changes in biological productivity and ocean-climatic fluctuations during the last ~1.5kyr in the Humboldt ecosystem off northern Chile (27°S): A multiproxy approach[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01
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