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Université de Fribourg

Geomorphic response to the lateglacial–holocene transition in high alpine regions (Sanetsch pass, Swiss alps)

Serra, Elena ; Valla, Pierre G. ; Gribenski, Natacha ; Guedes Magrani, Fabio ; Carcaillet, Julien ; Delaloye, Reynald ; Grobéty, Bernard ; Braillard, Luc

In: Boreas, 2020, p. bor.12480

Several palaeoclimatic archives have documented the pronounced climatic and environmental change associated with the Lateglacial–Holocene transition in the European Alps. However, the geomorphic response to this major environmental transition has only been punctually investigated. In this study, we propose a detailed reconstruction of post‐Last Glacial Maximum palaeoenvironmental...

Université de Fribourg

Cenozoic evolution of the steppe-desert biome in Central Asia

Barbolini, N. ; Woutersen, A. ; Dupont-Nivet, G. ; Silvestro, Daniele ; Tardif, D. ; Coster, P. M. C. ; Meijer, N. ; Chang, C. ; Zhang, H.-X. ; Licht, A. ; Rydin, C. ; Koutsodendris, A. ; Han, F. ; Rohrmann, A. ; Liu, X.-J. ; Zhang, Y. ; Donnadieu, Y. ; Fluteau, F. ; Ladant, J.-B. ; Le Hir, G. ; Hoorn, C.

In: Science Advances, 2020, vol. 6, no. 41, p. eabb8227

The origins and development of the arid and highly seasonal steppe-desert biome in Central Asia, the largest of its kind in the world, remain largely unconstrained by existing records. It is unclear how Cenozoic climatic, geological, and biological forces, acting at diverse spatial and temporal scales, shaped Central Asian ecosystems through time. Our synthesis shows that the Central Asian...

Haute Ecole pédagogique Fribourg

Grounding Social Foundations for Integrated Assessment Models of Climate Change

Mathias, Jean-Denis ; Debeljak, Marko ; Deffuant, Guillaume ; Diemer, Arnaud ; Dierickx Florian ; Donges, Jonathan F. ; Gladkykh, Ganna ; Heitzig, Jobst ; Holtz, Georg ; Obergassel, Wolfgang ; Pellaud, Francine ; Sanchez, Angel ; Trajanov, Aneta ; Videira, Nuno

In: AGU Advancing Earth and Space Science, 2020, vol. 8, no. 7, p. 1-5

Integrated assessment models (IAMs) are commonly used by decision makers in order to derive climate policies. IAMs are currently based on climate‐economics interactions, whereas the role of social system has been highlighted to be of prime importance on the implementation of climate policies. Beyond existing IAMs, we argue that it is therefore urgent to increase efforts in the integration of...

Université de Fribourg

The importance of input data quality and quantity in climate field reconstructions – results from the assimilation of various tree-ring collections

Franke, Jörg ; Valler, Veronika ; Brönnimann, Stefan ; Neukom, Raphael ; Jaume-Santero, Fernando

In: Climate of the Past, 2020, vol. 16, no. 3, p. 1061–1074

Differences between paleoclimatic reconstructions are caused by two factors: the method and the input data. While many studies compare methods, we will focus in this study on the consequences of the input data choice in a state-of-the-art Kalman- filter paleoclimate data assimilation approach. We evaluate reconstruction quality in the 20th century based on three collections of tree-ring...

Université de Fribourg

Last phase of the Little Ice Age forced by volcanic eruptions

Brönnimann, Stefan ; Franke, Jörg ; Nussbaumer, Samuel U. ; Zumbühl, Heinz J. ; Steiner, Daniel ; Trachsel, Mathias ; Hegerl, Gabriele C. ; Schurer, Andrew ; Worni, Matthias ; Malik, Abdul ; Flückiger, Julian ; Raible, Christoph C.

In: Nature Geoscience, 2019, vol. 12, no. 8, p. 650–656

During the first half of the nineteenth century, several large tropical volcanic eruptions occurred within less than three decades. The global climate effects of the 1815 Tambora eruption have been investigated, but those of an eruption in 1808 or 1809 whose source is unknown and the eruptions in the 1820s and 1830s have received less attention. Here we analyse the effect of the sequence of...