Université de Neuchâtel

Chemical and Biological Gradients along the Damma Glacier Soil Chronosequence, Switzerland

Bernasconi, Stefano M. ; Bauder, Andreas ; Bourdon, Bernard ; Brunner, Ivano ; Bünemann, Else ; Chris, Iso ; Derungsg, Nicolas ; Edwards, Peter ; Farinotti, Daniel ; Frey, Beat ; Frossard, Emmanuel ; Furrer, Gerhard ; Gierga, Merle ; Göransson, Hans ; Gülland, Kathy ; Hagedorn, Frank ; Hajdas, Irka ; Hindshawc, Ruth ; Ivy-Ochs, Susan ; Jansa, Jan ; Jonas, Tobias ; Kiczkac, Mirjam ; Kretzschmar, Ruben ; Lemarchand, Emmanuel ; Luster, Jörg ; Magnusson, Jan ; Mitchell, Edward A. D. ; Venterink, Harry Olde ; Plötze, Michael ; Reynolds, Ben ; Smittenberg, Rienk H. ; Stähli, Manfred ; Tamburini, Federica ; Tipper, Edward T. ; Wacker, Lukas ; Welc, Monika ; Wiederhold, Jan G. ; Zeyer, Josef ; Zimmermann, Stefan ; Zumsteg, Anita

In: Vadose Zone Journal, 2011, vol. 10, no. 3, p. 867-883

Soils are the product of a complex suite of chemical, biological, and physical processes. In spite of the importance of soils for society and for sustaining life on earth, our knowledge of soil formation rates and of the influence of biological activity on mineral weathering and geochemical cycles is still limited. In this paper we provide a description of the Damma Glacier Critical Zone...

Université de Neuchâtel

Origin and Nature of Green Clay Layers, ODP Leg 184, South China Sea

Tamburini, Federica ; Adatte, Thierry ; Föllmi, Karl B.

In: Proceedings of the Ocean Drilling Program, Scientific Results, 2003, vol. 184, p. 1-23

Green clay layers are reported from the Pliocene-Holocene intervals in five of the six sites drilled in the South China Sea (SCS) during Leg 184. Centimeter-scale discrete, discontinuous, and bioturbated layers, constituted by stiff and porous green clays, were observed, sometimes associated with iron sulfides and pyrite. Detailed mineralogical and geochemical analyses indicate that they...

Université de Neuchâtel

Phosphorus, a Servant Faithful to Gaia ? Biosphere Remediation Rather Than Regulation

Föllmi, Karl B. ; Tamburini, Federica ; Hosein, Rachel ; Van de Schootbrugge, Bas ; Arn, Kaspar ; Rambeau, Claire

In: Scientists Debate Gaia. The Next Century, 2004, vol. 2, p. 79-92

The global cycles of the biophile elements phosphorous and carbon are closely linked through their profound implication in two major biogeochemical processes, photosynthesis and biochemical weathering. In photosynthetic processes phosphorous may limit the transformation of atmospheric CO2 into organic carbon, and in biochemical weathering processes atmospheric CO2 may limit the mobilization of...

Université de Neuchâtel

Sedimentary phosphorus record from the Oman margin : New evidence of high productivity during glacial periods

Tamburini, Federica ; Föllmi, Karl B. ; Adatte, Thierry ; Bernasconi, Stefano M. ; Steinmann, Philipp

In: Paleoceanography, 2003, vol. 18, no. 1, p. 15(1-14)

The northern region of the Arabian Sea is one of the biologically most fertile regions of the world oceans, with present productivity rates varying between 150 and 2500 mgC/m2 × day [ Madhupratap et al., 1996 ]. This is related to the influence of the southwesterly summer monsoon which causes vigorous upwelling along the Oman margin. Upwelling ceases during northeasterly winter monsoon activity;...

Université de Neuchâtel

Dysaerobic conditions during Heinrich events 4 and 5 : Evidence from phosphorus distribution in a North Atlantic deep-sea core

Tamburini, Federica ; Huon, Sylvain ; Steinmann, Philipp ; Grousset, Francis E. ; Adatte, Thierry ; Föllmi, Karl B.

In: Geochimica et Cosmochimica Acta, 2002, vol. 66, p. 4069-4083

Reactive phosphorus undergoes diagenetic transformation once transferred into marine sediments. The degree of regeneration and redistribution of phosphorus depends on early diagenetic and environmental conditions, which may be linked to larger scale phenomena, such as bottom water circulation, water column ventilation, and organic carbon flux. Phosphorus phases of the <50-μm-sized fraction of...