English
norskBlar i forfatter "Vogt, Christoph"
Viser treff 1-7 av 7
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Continental weathering and recovery from ocean nutrient stress during the Early Triassic Biotic Crisis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-15)Following the latest Permian extinction ∼252 million years ago, normal marine and terrestrial ecosystems did not recover for another 5-9 million years. The driver(s) for the Early Triassic biotic crisis, marked by high atmospheric CO2 concentration, extreme ocean warming, and marine anoxia, remains unclear. Here we constrain the timing of authigenic K-bearing mineral formation extracted from ... -
Correspondence: Reply to ‘Challenges with dating weathering products to unravel ancient landscapes’
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-15)As the title of the correspondence by Fossen et al. suggests, determining the age of landscape elements of the Earth surface is difficult. We thus welcome the opportunity to clarify our arguments on the contentious themes touched upon by Fredin et al. -
Geochemical characterisation of northern Norwegian fjord surface sediments: A baseline for further paleo-environmental investigations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-26)Norwegian fjord sediments are promising archives for very high resolution records of past environmental changes. Recent investigations of the modern depositional environment within fjords revealed that the accurate quantification of the inputs, sources, and sedimentary preservation of organic and inorganic material is crucial to decipher long term past climate signals in the sedimentary record ... -
Glacial and environmental changes in northern Svalbard over the last 16.3 ka inferred from neodymium isotopes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-05)The reconstruction of past ice sheet extents and dynamics in polar regions is essential for understanding the global climate system and obtaining more reliable predictions of future climate change. Here, we present a multi-proxy dataset integrating the Nd isotopic compositions (εNd) of paired detrital and authigenic Fe oxide fractions, grain size distributions, organic geochemistry, and mineral ... -
The inheritance of a Mesozoic landscape in western Scandinavia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-28)In-situ weathered bedrock, saprolite, is locally found in Scandinavia, where it is commonly thought to represent pre-Pleistocene weathering possibly associated with landscape formation. The age of weathering, however, remains loosely constrained, which has an impact on existing geological and landscape evolution models and morphotectonic correlations. Here we provide new geochronological evidence ... -
Non-linear response of glacier melting to Holocene warming in Svalbard recorded by sedimentary iron (oxyhydr)oxides
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-01)The recent acceleration of ice-sheet loss with its direct impact on sea-level rise and coastal ecosystems is of major environmental and societal concern. However, the effect of atmospheric temperature increases on long-term glacier retreat remains poorly defined due to limited historical observations and uncertainties in numerical ice-sheet models, which challenges climate change adaptation planning. ... -
Reply to 'Challenges with dating weathering products to unravel ancient landscapes'
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-15)<i>Introduction</i>: As the title of the correspondence by Fossen et al.1 suggests, determining the age of landscape elements of the Earth surface is difficult. We thus welcome the opportunity to clarify our arguments on the contentious themes touched upon by Fredin et al.2 The age of landscapes has been a recurring research topic for the last century. Often, landscape ages can be deduced indirectly ...
