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Stream erosion in analogue models
(2023)EGUsphereThe presence of a strong interaction between tectonic deformation and surface processes is widely recognized. Still, the nature of this interaction is difficult to unravel and quantify. In the last decades, analogue landscape evolution models have been widely implemented and employed in different tectonic settings, to complement field campaign studies. Since the aim of these analogue models is to help the interpretation of data coming ...Other Conference Item -
Spring production of alkenones in Lake St Moritz (Switzerland): a first step towards the use of the alkenone paleothermometer in mid-latitude freshwater lakes
(2022)IAL-IPA 2022 Abstract Book - Lagos Memorias del TerritorioMost traditional paleoclimate proxies are either biased towards summer or assumed to record annual averages. We lack proxies for winter and transitional seasons. As a result, our vision of past climate is incomplete, which limits our understanding of climate mechanisms. A new paleothermometer has recently emerged and shows great potential to reconstruct past spring temperatures in freshwater lakes, the lacustrine alkenone biomarker. ...Other Conference Item -
Searching for the Little Ice Age in the last ~900 yrs record of the shallow lake Laguna Polo, Patagonia, Argentina
(2022)IAL-IPA 2022 Abstract Book - Lagos Memorias del TerritorioThe records of the Little Ice Age (LIA) in lacustrine sediments from southern south America (SSA) are still rare. Indeed, most of the evidence of this period in SSA comes from tree rings records. Our main goal was identifying the signal of the LIA at Laguna Polo (49° 15’ 59.4” S, 72° 53’ 38.4” W), in Santa Cruz, southern part of Patagonia. For this multiproxy reconstruction, we analyzed a 54-cm long sediment core and conducted paleoecological ...Other Conference Item -
The Southern Ocean during the ice ages: A slumped pycnocline from reduced wind-driven upwelling?
(2022)EGUsphereThe Southern Ocean is recognized as a potential cause of the lower atmospheric concentration of CO2 during ice ages, but the mechanism is debated. In the ice age Antarctic Zone, biogeochemical paleoproxy data suggest a reduction in the exchange of nutrients (and thus water and carbon) between the surface and the deep ocean. We report simple calculations with those data indicating that the decline in the supply of nutrients during peak ...Other Conference Item -
Comparing Cornelius Castoriadis’s Autonomy with Henri Lefebvre’s Autogestion: Urban Politics between State and Human Reason
(2022)International Conference Cornelius Castoriadis: 1922-2022 One Hundred Υears since the Birth of the Philosopher of Autonomy. Abstracts, CVsThe paper compares Cornelius Castoriadis and Henri Lefebvre’s approaches. It places particular emphasis on “the imaginary” in the politics of self-governance, rendering explicit how the imaginary accompanying self-governance revive the tension between State reason and human reason and. Castoriadis, in The Imaginary Institution of Society, emphasizes the internal relation between what is intended – the development of autonomy – and that ...Other Conference Item -
Terrestrial hydroclimate reconstructions of ‘fossil rainwater’ from Arabian arid-zone speleothems
(2022)EGUsphereThe global development and modern distribution of arid zones in subtropical regions (drylands) are likely associated with the global cooling marking the dawn of the Quaternary (~2.6 Ma). This coincides with global shifts in ocean circulation patterns, the intensification of the Walker-Hadley circulation, declining atmospheric CO2, the initiation of glacial–interglacial cycles and the intensification of Northern Hemisphere glaciation, the ...Other Conference Item -
Northwest Indian stalagmite shows evidence for recurring summer and winter droughts after 4.2 ka BP
(2022)EGUsphereWe reconstructed changes in summer and winter precipitation using a well-dated (±18 years 2σ error) speleothem spanning 4.2-3.1 ka BP from Dharamjali Cave in the central Himalaya. The record was sampled at a sub-annual resolution for a suite of trace elements, as well oxygen and carbon stable isotopes. Calcium isotopes at decadal resolution provide additional hydroclimatic evidence. This DHAR-1 stalagmite records a 230-year period of ...Other Conference Item -
Potential of lacustrine alkenones as a novel proxy for spring temperatures in mid-latitude European lakes
(2022)EGUspherePast temperature records are key tools for inferring climate dynamics and provide empirical data for testing climate models to improve our mechanistic understanding of natural climate variability. Unfortunately, very few quantitative records of pre-historic continental temperatures exist in Europe. Moreover, existing paleothermometers mainly provide mean annual or warm season temperatures, limiting our understanding of climate variability ...Other Conference Item -
Radiocarbon constraints on carbon cycling in plants and soils
(2021)EGUsphereTracing ‘bomb’ radiocarbon produced by atmospheric testing of atomic weapons through vegetation and soils provides information of the dynamics of terrestrial carbon cycling on timescales of years to centuries. Processes operating on these timescales are of interest because they regulate key functions in long-lived plants and regulate the potential for increasing soil carbon storage. However, the multiple pathways taken by carbon transiting ...Other Conference Item -
Fluid Flow Modeling using Geochemistry to Characterize the Songwe Medium Temperature Geothermal System-Tanzania
(2021)EGUsphereA geothermal area with only bicarbonate thermal water discharges at medium temperature requires a more integrated analysis than used in classical geochemical exploration. This signature is typical for steam-heated water, which commonly occurs at the margins of a geothermal system. However, these waters can also rise from carbonate rich layers in the central part of the field. Our study shows that fluid flow modeling can identify the exact ...Other Conference Item