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  • Other Sources  (3)
  • 1
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    Created by the Monte Peron rock avalanche: Lago di Vedana (Dolomites, Italy) and its sediment record of landscape evolution after a mass wasting event (2021)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2023-06-19
    Description: The timing of the Monte Peron Landslide is revised to 2890 cal. BP based on a radiocarbon-dated sediment stratigraphy of Lago di Vedana. This age fosters the importance of hydroclimatic triggers in the light of accelerating global warming with a predicted increase of precipitation enhancing the regional predisposition to large landslides. Moreover, a layer enriched in allochthonous organic and minerogenic detritus dating to the same wet period is interpreted as response to a younger and yet unidentified mass wasting event in the catchment of Lago di Vedana. Rock debris of the Monte Peron Landslide impounded the Cordevole River valley and created a landslide-dammed lake. Around AD 1150, eutrophication of this lacustrine ecosystem started with intensified human occupation – a process that ended 150 years later, when the river was diverted back into its original bed. Most likely, this occurred due to artificial opening of the river dam. In consequence, Lago di Vedana was isolated from an open and minerogenic to an endorheic and carbonaceous lacustrine system. After a monastery was established nearby in AD 1457, a second eutrophication process was initiated due to intensified land use linked with deforestation. Only in the eighteenth and nineteenth centuries, deposition of organic matter decreased coinciding with climatic (Little Ice Age) and cultural changes. Conversational measures are the likely reasons for a trend towards less eutrophic conditions since AD 1950.
    Description: Universität Bremen (1013)
    Description: https://doi.org/10.1594/PANGAEA.937090
    Keywords: ddc:551.3 ; Landslide ; XRF scanning ; Geochemistry ; Soil erosion ; Cultural eutrophication ; Late Holocene
    Language: English
    Type: doc-type:article
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  • 2
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    Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 (2016)
    Nature Research
    Details
    Publication Date: 2023-08-01
    Description: Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18–15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5–1.5 °C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes.
    Type: Article , PeerReviewed
    Format: text
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  • 3
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    Rekonstruktion spät- und postglazialer Umweltbedingungen an einem Torfprofil aus dem Varreler Schlatt (Landkreis Diepholz, Nordwestdeutschland) (2018)
    Details
    Publication Date: 2021-03-29
    Description: Abstract: The local and regional forest vegetation, the development of the mire and the local development of settlement near the peat bog ´Varreler Schlatt´ (district Diepholz, Northwestern Germany) were reconstructed by pollen and sedimentological parameters (water-content, dry density, the contents of carbon and nitrogen and C/N). The 3.5 m long profile starts due to pollen stratigraphy 12.000 years ago and includes the chrono-zones since Allerød. Between 0.9 and 1.5 m depth is a hiatus, probably caused by peat cutting during World War II. Thereby the peat since Subatlantic until 1950 AD were removed.
    Description: Zusammenfassung: Anhand pollenanalytischer und sedimentologischer Parameter (Wassergehalt, Trockendichte, Kohlenstoff- und Stickstoff-Gehalt und C/N) wurde die lokale und regionale Waldvegetation, die Moorentwicklung und die lokale Siedlungsentwicklung für das Kleinstmoor Varreler Schlatt (Landkreis Diepholz, Nordwestdeutschland) rekonstruiert. Das 3,5 m lange Profil setzt pollenstratigraphisch vor ca. 12.000 Jahren ein und umfasst die Chronozonen ab Alleröd. Zwischen 0,9 und 1,5 m Tiefe ist ein Hiatus, der durch Torfstich vermutlich während des 2. Weltkrieges hervorgerufen wurde. Dadurch wurden Torfe ab Subatlantikum bis 1950 AD entfernt.
    Description: DFG, SUB Göttingen, DGMT
    Description: research
    Keywords: 553.21 ; Moor ; palaeoenvironment ; C/N ; Pollen ; Torf ; peatland ; peat ; Niedersachsen ; vegetation ; Sedimentology ; FID-GEO-DE-7
    Language: German
    Type: article , publishedVersion
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