Search Results - (Author, Cooperation:H. A. Bauch)
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1Latest Papers from Table of Contents or Articles in PressD. J. Thornalley ; H. A. Bauch ; G. Gebbie ; W. Guo ; M. Ziegler ; S. M. Bernasconi ; S. Barker ; L. C. Skinner ; J. Yu
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-08-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1437-3262Keywords: Key words Marine sediments ; Glacial ; interglacial change ; Sediment gray-level reflectance ; Biogenic carbonate ; Organic carbon ; Calcite dissolution ; Nordic seasSource: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract The reflectance of sediments (gray level) were measured on 11 sediment cores from the Norwegian–Greenland–Iceland Sea (Nordic seas). The analyzed time interval covers the past five glacial–interglacial cycles. Although the results demonstrate that the gray-level method has a potential for stratigraphic purposes, it is indicated that gray-level changes in the Nordic seas are not necessarily driven by variations in the content of biogenic calcite. A detailed comparison of gray-level values with contents of total CaCO3 (carbonate) and total organic carbon (TOC) reveals no overall causal link between these proxies. However, specific glacial core sections with layers containing organic-rich sediment clasts as a consequence of iceberg-rafting seem to correlate well with law gray-level values. Of those cores which show relatively high and comparable carbonate values in the last three main interglacial intervals (stages 11, 5.5, and 1), stage 11 is always marked by the highest gray-level values. A close inspection of the surface structure of the foraminiferal tests as well as the conduction of reflectance measurements on these tests leads to the conclusion that enhanced carbonate corrosion occurred during stage 11. The test corrosion not only affected the reflectance of the tests by making them appear whiter, it also seems responsible for the comparatively high gray-level values of the total sediment in stage 11. In contrast, the relatively low gray-level values found in stages 5.5, and 1 are not associated with enhanced test corrosion. This observation implies that variable degrees of carbonate corrosion can have a profound effect on total sediment reflectance.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesMueller-Lupp, T. ; Bauch, H. A. ; Erlenkeuser, H. ; Hefter, J. ; Kassens, H. ; Thiede, J.
Springer
Published 2000Staff ViewISSN: 1437-3262Keywords: Stable carbon isotopes Organic carbon Land-shelf interaction Holocene sediments Laptev Sea SiberiaSource: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract. Stable carbon isotope ratios in the organic fraction of surface sediments from the Laptev Sea shelf were analyzed in order to study the modern distribution pattern of terrestrial organic matter. The δ13Corg signature of the surface sediments range from –26.6‰ near the coastal margin to –22.8‰ in the north towards the outer shelf. Characterizing the possible sources of organic matter by their δ13Corg signature reveals that the terrestrial influence reaches further north in the eastern than in the western Laptev Sea. Downcore records of the δ13Corg, measured on three AMS 14C-dated cores from water depths between 46 and 77 m, specify the spatial and temporal changes in the deposition of terrestrial organic matter on the Laptev Sea shelf during the past 12.7 ka. The major depositional changes of terrestrial organic matter occurred between 11 and 7 ka and comprised the main phase of the southward retreat of the coastline and of the river depocenters due to the postglacial sea level rise.Type of Medium: Electronic ResourceURL: