globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.029
Scopus记录号: 2-s2.0-85021941949
论文题名:
Dynamics and sources of last glacial aeolian deposition in southwest France derived from dune patterns, grain-size gradients and geochemistry, and reconstruction of efficient wind directions
作者: Sitzia L.; Bertran P.; Sima A.; Chery P.; Queffelec A.; Rousseau D.-D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 170
起始页码: 250
结束页码: 268
语种: 英语
英文关键词: Coversand ; Dunes ; Geochemistry ; Grain-size modelling ; Last glacial ; Loess ; Southwest France ; Wind direction
Scopus关键词: Air pollution control ; Analytical geochemistry ; Deposition ; Dust ; Geochemistry ; Glacial geology ; Sediments ; Coversand ; Dunes ; Grain size ; Last glacial ; Loess ; Southwest France ; Wind directions ; Bacteriology ; abrasion ; alluvial deposit ; deflation ; dune ; eolian deposit ; geochemistry ; grain size ; Last Glacial ; loess ; paleoclimate ; reconstruction ; sand ; sediment transport ; spatial distribution ; wind direction ; wind erosion ; Younger Dryas ; France ; Garonne River
英文摘要: Dune pattern, grain-size gradients and geochemistry were used to investigate the sources and dynamics of aeolian deposition during the last glacial in southwest France. The coversands form widespread fields of low-amplitude ridges (zibars), whereas Younger Dryas parabolic dunes mainly concentrate in corridors and along rivers. Spatial modelling of grain-size gradients combined with geochemical analysis points to a genetic relationship between coversands and loess, the latter resulting primarily from dust produced by aeolian abrasion of the coversands. The alluvium of the Garonne river provided also significant amounts of dust at a more local scale. The geochemical composition of loess shows much lower scattering than that of coversands, due to stronger homogenisation during transport in the atmosphere. Overall, sandy loess and loess deposits decrease in thickness away from the coversands. Dune orientation and grain-size gradients suggest that the efficient winds blew respectively from the W to the NW during the glacial, and the W-SW during the Younger Dryas. A comparison between the wind directions derived from the proxy data and those provided by palaeoclimatic simulations suggests a change of the main transport season. Ground surface conditions and their evolution throughout the year, i.e. the length of the season with snow and frozen or moist topsoil, and the seasonal distribution of wind speeds able to cause deflation are thought to have been the main factors that controlled the transport season in the study area. © 2017 Elsevier Ltd
资助项目: We acknowledge Christophe Tuffery (Inrap) for his help in the GIS. This work was funded by Inrap, the University of Bordeaux and Lascarbx (Universités de Bordeaux, program of the Agence Nationale de la Recherche ANR-10-LABX-52). The Labex L-IPSL, which is funded by the ANR (grant #ANR-10-LABX-0018), is also acknowledged. This is LDEO #8118. The two anonymous reviewers are also thanked for their remarks, which contributed to greatly improve the manuscript. The simulations used here have been run on the HPC facilities of the Commissariat à l'Energie Atomique.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59143
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作者单位: Universidad de Tarapacá, Instituto de Alta Investigación, Laboratorio de Análisis e Investigaciones Arqueométricas, Antofagasta 1520, Arica, Chile; INRAP, 140 Avenue Leclerc, Bègles, France; PACEA, Université de Bordeaux – CNRS, bâtiment B18, allée Geoffroy-Saint-Hilaire, Pessac Cedex, France; Laboratoire de Météorologie Dynamique/IPSL, Sorbonne Universités, UPMC Université Paris 06, ENS, PSL Research University, École Polytechnique, Université Paris Saclay, CNRS, Paris, France; Bordeaux Sciences Agro, 1 cours du Général de Gaulle, CS 40201, Gradignan, France; Laboratoire de Météorologie Dynamique/IPSL, Département de géosciences, ENS, PSL Research University, École Polytechnique, Université Paris Saclay, Sorbonne Universités, UPMC Université Paris 06, CNRS, Paris, France; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States

Recommended Citation:
Sitzia L.,Bertran P.,Sima A.,et al. Dynamics and sources of last glacial aeolian deposition in southwest France derived from dune patterns, grain-size gradients and geochemistry, and reconstruction of efficient wind directions[J]. Quaternary Science Reviews,2017-01-01,170
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