DOI: 10.1016/j.quascirev.2016.11.010
Scopus记录号: 2-s2.0-84997503391
论文题名: A high-resolution temporal record of environmental changes in the Eastern Caribbean (Guadeloupe) from 40 to 10 ka BP
作者: Royer A. ; Malaizé B. ; Lécuyer C. ; Queffelec A. ; Charlier K. ; Caley T. ; Lenoble A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 155 起始页码: 198
结束页码: 212
语种: 英语
英文关键词: Carbon isotope
; Caribbean Basin
; Guano
; Last Glacial
; Nitrogen isotope
Scopus关键词: Caves
; Climate change
; Driers (materials)
; Glacial geology
; Manures
; Nitrogen
; Stratigraphy
; Vegetation
; Carbon isotopes
; Caribbean Basin
; Guano
; Last glacial
; Nitrogen isotopes
; Isotopes
英文摘要: In neotropical regions, fossil bat guano accumulated over time as laminated layers in caves, hence providing a high-resolution temporal record of terrestrial environmental changes. Additionally, cave settings have the property to preserve such organic sediments from processes triggered by winds (deflation, abrasion and sandblasting) and intense rainfall (leaching away). This study reports both stable carbon and nitrogen isotope compositions of frugivorous bat guano deposited in a well-preserved stratigraphic succession of Blanchard Cave on Marie-Galante, Guadeloupe. These isotopic data are discussed with regard to climate changes and its specific impact on Eastern Caribbean vegetation during the Late Pleistocene from 40 to 10 ka cal. BP. Guano δ13C values are higher than modern ones, suggesting noticeable vegetation changes. This provides also evidence for overall drier environmental conditions during the Pleistocene compared to today. Meanwhile, within this generally drier climate, shifts between wetter and drier conditions can be observed. Large temporal amplitudes in both δ13C and δ15N variations reaching up to 5.9‰ and 16.8‰, respectively, also indicate these oceanic tropical environments have been highly sensitive to regional or global climatic forcing. Stable isotope compositions of bat guano deposited from 40 to 35 ka BP, the Last Glacial Maximum and the Younger-Dryas reveal relatively wet environmental conditions whereas, at least from the end of the Heinrich event 1 and the Bølling period the region experienced drier environmental conditions. Nevertheless, when considering uncertainties in the model age, the isotopic record of Blanchard Cave show relatively similar variations with known proxy records from the northern South America and Central America, suggesting thus that the Blanchard Cave record is a robust proxy of past ITCZ migration. Teleconnections through global atmospheric pattern suggest that islands of the eastern Caribbean Basin could be also under the influence of a bipolar temperature gradients that impact the mean location of the ITCZ, with a Southern Hemisphere imprint during the glacial period and a more significant role of Northern Hemisphere during the last deglaciation. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59354
Appears in Collections: 过去全球变化的重建
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作者单位: Université de Bordeaux, CNRS UMR 5199 PACEA, Bâtiment B18, Allée Geoffroy Saint Hilaire, CS 50023, Pessac Cedex, France; Université de Bordeaux, CNRS UMR 5805 EPOC, Bâtiment B18, Allée Geoffroy Saint Hilaire, CS 50023, Pessac Cedex, France; Université Lyon 1, CNRS UMR 5276 Laboratoire de Géologie de Lyon, et Ecole Normale Supérieure de Lyon, Villeurbanne, France; Institut Universitaire de France, Paris, France
Recommended Citation:
Royer A.,Malaizé B.,Lécuyer C.,et al. A high-resolution temporal record of environmental changes in the Eastern Caribbean (Guadeloupe) from 40 to 10 ka BP[J]. Quaternary Science Reviews,2017-01-01,155