Top 3 Eartharxiv Papers Today in Physical Sciences And Mathematics


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#1. Spatially distributed chaos and turbulence in clouds
Alexander Bershadskii
Spatially distributed chaos (turbulence) in the cumulus and stratiform clouds have been studied using results of direct numerical simulations and radiometric measurements in cloudy atmosphere. It is shown that in the both cases the second order moment of helicity distribution (the Levich-Tsinober invariant) dominates the kinetic energy spectra.
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#2. Pleistocene - Holocene volcanism at the Karkar geothermal prospect, Armenia
Khachatur Meliksetian, Iain Neill, Dan N. Barfod, Eilidh Milne, Emma Waters, Gevorg Navasardyan, Edmond Grigoryan, Valerie Olive, Nicholas Odling, Arkady Karakhanian
Pleistocene to Holocene volcanic centres north of the Bitlis-Zagros suture in Turkey, Iran, Armenia and Georgia represent both volcanic hazards and potential or actual geothermal energy resources. Such challenges and opportunities cannot be fully quantified without understanding these volcanoes’ petrogenesis, geochronology and magmatic, tectonic or other eruption triggers. We discuss the age and igneous geology of the Karkar monogenetic volcanic field in Syunik, SE Armenia. The ~30 km^2 field is beside the location of Armenia’s only geothermal energy test drilling site. Eruptions of fissure-fed trachybasaltic andesite to trachyandesite occurred on a trans-tensional pull-apart segment of the Pambak-Sevan-Syunik Fault and have previously been interpreted to be of Holocene age. We conducted high-resolution duplicate Ar/Ar dating of 7 groundmass separates, providing composite plateau or inverse isochron ages ranging from 6 ± 3 ka to 332 ± 9 ka (2σ). Each lava flow displays petrographic and geochemical patterns consistent with melting...
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#3. Dilation of subglacial sediment governs incipient surge motion in glaciers with deformable beds
Brent Minchew, Colin R. Meyer
Glacier surges are quasi-periodic episodes of rapid ice flow that arise from increases in slip-rate at the ice-bed interface. The mechanisms that trigger and sustain surges are not well-understood. Here, we develop a new model of incipient surge motion for glaciers underlain by sediments to explore how surges may arise from slip instabilities within this thin layer of saturated, deforming subglacial till. Our model represents the evolution of internal friction, porosity, and pore water pressure within the sediments as functions of the rate and history of shearing. Changes in pore water pressure govern incipient surge motion, with less-permeable till facilitating surging because dilation-driven reductions in pore-water pressure slow the rate at which till tends toward a new steady state, thereby allowing time for the glacier to thin dynamically. The reduction of overburden pressure at the bed caused by dynamic thinning of the glacier sustains surge acceleration in our model. The need for changes in both the hydromechanical...
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MITglaciology: Interested in surge mechanisms in glaciers with deformable beds? Then check out our (@MITglaciology and @colinrmeyer) new preprint in @EarthArXiv: Dilation of subglacial sediment governs incipient surge motion in glaciers with deformable beds https://t.co/CIyNcg8bin
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