globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.07.028
Scopus记录号: 2-s2.0-84980320142
论文题名:
Sources, transport and deposition of terrestrial organic material: A case study from southwestern Africa
作者: Herrmann N.; Boom A.; Carr A.S.; Chase B.M.; Granger R.; Hahn A.; Zabel M.; Schefuß E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 149
起始页码: 215
结束页码: 229
语种: 英语
英文关键词: Compound-specific carbon isotopes ; Marine surface sediments ; n-Alkanes ; Soils ; South Africa
Scopus关键词: Carbon ; Catchments ; Citrus fruits ; Paraffins ; Rivers ; Runoff ; Sediments ; Soils ; Submarine geology ; Surficial sediments ; Vegetation ; Carbon isotopes ; Environmental change ; Inorganic materials ; Marine surfaces ; n-Alkanes ; South Africa ; Terrigenous inputs ; Vegetation community ; Suspended sediments ; alkane ; alluvial deposit ; carbon isotope ; catchment ; deposition ; environmental change ; fynbos ; Holocene ; marine sediment ; paleoclimate ; pollutant source ; pollutant transport ; sediment chemistry ; Orange River ; Saint Helena Bay ; South Africa ; Western Cape
英文摘要: Southwestern Africa's coastal marine mudbelt, a prominent Holocene sediment package, provides a valuable archive for reconstructing terrestrial palaeoclimates on the adjacent continent. While the origin of terrestrial inorganic material has been intensively studied, the sources of terrigenous organic material deposited in the mudbelt are yet unclear. In this study, plant wax derived n-alkanes and their compound-specific δ13C in soils, flood deposits and suspension loads from regional fluvial systems and marine sediments are analysed to characterize the origin of terrestrial organic material in the southwest African mudbelt. Soils from different biomes in the catchments of the Orange River and small west coast rivers show on average distinct n-alkane distributions and compound-specific δ13C values reflecting biome-specific vegetation types, most notably the winter rainfall associated Fynbos Biome of the southwestern Cape. In the fluvial sediment samples from the Orange River, changes in the n-alkane distributions and compound-specific δ13C compositions reveal an overprint by local vegetation along the river's course. The smaller west coast rivers show distinct signals, reflecting their small catchment areas and particular vegetation communities. Marine surface sediments spanning a transect from the northern mudbelt (29°S) to St. Helena Bay (33°S) reveal subtle, but spatially coherent, changes in n-alkane distributions and compound-specific δ13C, indicating the influence of Orange River sediments in the northern mudbelt, the increasing importance of terrigenous input from the adjacent western coastal biomes in the central mudbelt, and contributions from the Fynbos Biome to the southern mudbelt. These findings indicate the different sources of terrestrial organic material deposited in the mudbelt, and highlight the potential the mudbelt has to preserve evidence of environmental change from the adjacent continent. © 2016 Elsevier Ltd
资助项目: This study was funded by the Bundesministerium für Bildung und Forschung within the project „Regional Archives for Integrated Investigation” (RAiN, 03G0840A). This work was also supported by the Leverhulme Trust (Grant F/00 212/AF) and the European Research Council (ERC) Starting Grant ‘‘HYRAX’’ (Grant Agreement No. 258657). We thank the captain, the crew and the scientists of Meteor cruise M57-1 for recovering the marine sediment samples. Xueqin Zhao and Lydie Dupont are thanked for helpful discussion and Thilo Eickhorst is thanked for help with soil import. We are grateful to Ralph Kreutz and Oliver Helten for analytical assistance. Finally, we thank the two anonymous reviewers for their constructive comments.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59454
Appears in Collections:过去全球变化的重建

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作者单位: MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, Bremen, Germany; Department of Geography, University of Leicester, University Road, Leicester, United Kingdom; Centre National de Recherche Scientifique, UMR 5554, Institute des Sciences de l'Evolution de Montpellier, Département Paléoenvironnements, Université Montpellier, Bat.22, CC061, Place Eugène Bataillon, Montpellier Cedex 5, France; Department of Environmental and Geographical Science, University of Cape Town, Rondebosch, South Africa

Recommended Citation:
Herrmann N.,Boom A.,Carr A.S.,et al. Sources, transport and deposition of terrestrial organic material: A case study from southwestern Africa[J]. Quaternary Science Reviews,2016-01-01,149
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