Papers by Clemens von Scheffer
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Les Alpes europeennes ont connu plusieurs phases de colonisation humaine. Cependant, l'intera... more Les Alpes europeennes ont connu plusieurs phases de colonisation humaine. Cependant, l'interaction entre climat et impacts humains sur l'environnement dans le passe n'est pas encore totalement comprise dans cette region de haute montagne. Il existe notamment un manque de connaissances sur la chronologie et l'ampleur des impacts humains dans les Alpes centrales du nord (ACN) pendant l'Holocene, que cette etude comble en utilisant des analyses geochimiques, de palynologiques et de datation radiocarbone comparees avec des donnees archeologiques et historiques regionales. Des tourbieres dans trois secteurs des ACN ont ete choisies comme sites d'etude: Petite Vallee de Walser (PVA, Autriche), Tourbiere Piller (TP, Autriche), vallee de Fimba (VF, Suisse). La geochimie de sequences de tourbe est une methode bien etablie pour detecter les apports mineraux, l'erosion ou les activites metallurgiques. L'application de l'analyse par fluorescence des rayons X ...
Bookmarks Related papers MentionsView impact
Phytocoenologia
Bookmarks Related papers MentionsView impact
Scientific reports, 2015
Atmospheric dust loadings play a crucial role in the global climate system. Southern South Americ... more Atmospheric dust loadings play a crucial role in the global climate system. Southern South America is a key dust source, however, dust deposition rates remain poorly quantified since the last glacial termination (~17 kyr ago), an important timeframe to anticipate future climate changes. Here we use isotope and element geochemistry in a peat archive from Tierra del Fuego, to reconstruct atmospheric dust fluxes and associated environmental and westerly wind changes for the past 16.2 kyr. Dust depositions were elevated during the Antarctic Cold Reversal (ACR) and second half of the Younger Dryas (YD) stadial, originating from the glacial Beagle Channel valley. This increase was most probably associated with a strengthening of the westerlies during both periods as dust source areas were already available before the onset of the dust peaks and remained present throughout. Congruent with glacier advances across Patagonia, this dust record indicates an overall strengthening of the wind bel...
Bookmarks Related papers MentionsView impact
Scientific reports, 2015
Atmospheric dust loadings play a crucial role in the global climate system. Southern South Americ... more Atmospheric dust loadings play a crucial role in the global climate system. Southern South America is a key dust source, however, dust deposition rates remain poorly quantified since the last glacial termination (~17 kyr ago), an important timeframe to anticipate future climate changes. Here we use isotope and element geochemistry in a peat archive from Tierra del Fuego, to reconstruct atmospheric dust fluxes and associated environmental and westerly wind changes for the past 16.2 kyr. Dust depositions were elevated during the Antarctic Cold Reversal (ACR) and second half of the Younger Dryas (YD) stadial, originating from the glacial Beagle Channel valley. This increase was most probably associated with a strengthening of the westerlies during both periods as dust source areas were already available before the onset of the dust peaks and remained present throughout. Congruent with glacier advances across Patagonia, this dust record indicates an overall strengthening of the wind bel...
Bookmarks Related papers MentionsView impact
E&G Quaternary Science Journal, 2019
In this study, we combine erosion and anthropogenic proxies (Ti, Pb) from calibrated portable XRF... more In this study, we combine erosion and anthropogenic proxies (Ti, Pb) from calibrated portable XRF with pollen and radiocarbon chronologies in peat from mires of the Kleinwalser Valley (Kleinwalsertal, Vorarlberg, Austria) to reconstruct palaeoenvironmental change and human impact in the northern central Alps. Favoured by a wetter climate, two analysed mires formed 6200 years ago in a densely forested valley. Landscape opening suggests that the first anthropogenic impact emerged around 5700 to 5300 cal BP. Contemporaneously, lead enrichment factors (Pb EFs) indicate metallurgical activities, predating the earliest archaeological evidence in the region. Pollen and erosion proxies show that large-scale deforestation and land use by agro-pastoralists took place from the mid- to late Bronze Age (3500 to 2800 cal BP). This period was directly followed by a prominent peak in Pb EF, pointing to metallurgical activities again. After 200 cal CE, a rising human impact was interrupted by climatic deteriorations in the first half of the 6th century CE, probably linked to the Late Antique Little Ice Age. The use of the characteristic Pb EF pattern of modern pollution as a time marker allows us to draw conclusions about the last centuries. These saw the influence of the Walser people, arriving in the valley after 1300 cal CE. Later, the beginning of tourism is reflected in increased erosion signals after 1950 cal CE. Our study demonstrates that prehistoric humans were intensively shaping the Kleinwalser Valley's landscape, well before the arrival of the Walser people. It also demonstrates the importance of palaeoenvironmental multiproxy studies to fill knowledge gaps where archaeological evidence is lacking.
Bookmarks Related papers MentionsView impact
Uploads
Papers by Clemens von Scheffer