Filtering by Subject: Physical Sciences and Mathematics

Hydroclimatic Analysis of Rising Water Levels in the Great Rift Valley Lakes of Kenya

Mathew Herrnegger, Gabriel Stecher, Christian Schwatke, Luke Olang

Published: 2021-05-05
Subjects: Engineering, Physical Sciences and Mathematics

The Central Rift Valley lakes of Kenya have recently experienced significant increases in their water levels, negatively impacting the local communities. This has provoked renewed concerns about the causations, with various geological, anthropogenic and hydro-climatic influences hypothesized as potential causes of the water level rises. This study systematically analyses and documents water [...]

Tectonic geomorphology of the Jhelum fault zone & its contiguous regions in western Himalaya

Afroz Ahmad Ahmad Shah, Syaakiirroh Sahari1, Navakanesh B., Nurhafizah A.M., Fu Fui1, Ashwini R., Talha Q.

Published: 2021-05-02
Subjects: Education, Physical Sciences and Mathematics

The western Himalayan syntaxis represents the region where the major Himalayan structures abruptly curve and the cause of the curvature and the tectonic geomorphology of the region has not been fully explored. The lack of detailed structural maps with extensive field-based data is missing, which is mainly because of the political problems related to border sharing between Pakistan, India, and [...]

CO2 capture by pumping surface acidity to the deep ocean

Michael Tyka, John C Platt, Christopher Van Arsdale

Published: 2021-04-30
Subjects: Chemical Engineering, Climate, Engineering, Environmental Engineering, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

The majority of IPCC scenarios call for active CO2 removal (CDR) to remain below 2oC of warm- ing. On geological timescales, ocean uptake regulates atmospheric CO2 concentration, with two homeostats driving CO2 uptake: dissolution of deep ocean calcite deposits and terrestrial weathering of silicate rocks, acting on 1ka to 100ka timescales, respectively. Many current ocean-based CDR proposals [...]

Use of environmental tracers (tritium3H and SF6) to improve knowledge of aquifer storage capacity, residence time and sustainability in the crystalline rock island aquifer of Tobago, West Indies.

Marsha Kezia Allen, David Boutt

Published: 2021-04-29
Subjects: Physical Sciences and Mathematics

Understanding the residence time, flow velocities and storage volumes in fractured rock aquifers is essential for assessing the sustainable use of groundwater in island aquifer systems. Environmental tracers such as tritium (3H) and sulfur hexafluoride (SF6) that enter the aquifer systems through natural hydrological processes are effectively used to quantify the “apparent age” of young [...]

Expert judgements on solar geoengineering research priorities and challenges

Peter James Irvine, Elizabeth Burns, Ken Caldeira, Frank N Keutsch, Dustin Tingley, David Keith

Published: 2021-04-29
Subjects: Physical Sciences and Mathematics, Social and Behavioral Sciences

Solar geoengineering describes a set of proposals to deliberately alter the earth’s radiative balance to reduce climate risks. We elicit judgements on natural science research priorities for solar geoengineering through a survey and in-person discussion with 72 subject matter experts, including two thirds of all scientists with ≥10 publications on the topic. Experts prioritized Earth system [...]

Probing the nucleation of iron in Earth’s core using MD simulations of supercooled liquids

Alfred Wilson, Andrew Walke, Dario Alfè, Christopher J Davies

Published: 2021-04-29
Subjects: Earth Sciences, Physical Sciences and Mathematics

Classical nucleation theory describes the formation of the first solids from supercooled liquids and predicts an average waiting time for a system to freeze as it is supercooled to temperatures below the melting temperature. For systems at low to moderate undercooling, waiting times are too long for freezing to be observed via experiment or simulation. Here a system can be described by estimated [...]

Evapotranspiration and energy partitioning across a forest-shrub vegetation gradient in a subarctic, alpine catchment

Erin Marie Nicholls, Sean Carey

Published: 2021-04-27
Subjects: Physical Sciences and Mathematics

As a result of altitude and latitude amplified climate change, widespread changes in vegetation composition, density and distribution have been observed across northern regions. Despite wide documentation of shrub proliferation and treeline advance, few field-based studies have evaluated the hydrological implications of these changes. Quantification of total evapotranspiration (ET) across a range [...]

Utilizing Random Forest Machine Learning Models to Determine Water Table Flood Levels through Volunteered Geospatial Information

Raghav Sriram

Published: 2021-04-27
Subjects: Applied Mathematics, Computer Sciences, Earth Sciences, Environmental Sciences, Physical Sciences and Mathematics

Many people use smartphone cameras to record their living environments through captured images, and share aspects of their daily lives on social networks, such as Facebook, Instagram, and Twitter. These platforms provide volunteered geographic information (VGI), which enables the public to know where and when events occur. At the same time, image-based VGI can also indicate environmental changes [...]

Six simple steps towards making GEES fieldwork more accessible and inclusive

Anya Lawrence, Natasha Joanne Dowey

Published: 2021-04-26
Subjects: Education, Physical Sciences and Mathematics

Fieldwork is an essential aspect of Geography, Earth and Environmental Science programme curriculums, and a defining aspect of most geoscience-related degrees. At its best, fieldwork offers students valuable opportunities to develop independent research skills in real-world situations, examine analogues for a range of geoscientific concepts, and socialise with peers. It offers experiences that [...]

Note on the bulk estimate of the energy dissipation rate in the bottom boundary layer

Xiaozhou Ruan

Published: 2021-04-26
Subjects: Oceanography, Physical Sciences and Mathematics

The dissipation of the kinetic energy (KE) associated with oceanic flows is believed to occur primarily in the oceanic bottom boundary layer (BBL) where bottom drag converts the KE from mean flows to heat loss through irreversible mixing at molecular scales. Due to the practical difficulties associated with direct observations on small-scale turbulence close to the seafloor, most up-to-date [...]

Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic

Alan Condron, Jenna Hill

Published: 2021-04-26
Subjects: Physical Sciences and Mathematics

High resolution seafloor mapping shows extraordinary evidence that massive (>300m thick) icebergs once drifted >5,000km south along the eastern United States, with over 700 iceberg scours now identified south of Cape Hatteras. Sediment cores collected from several buried scours show multiple plow marks are ~31,000 years old and align with Heinrich Event 3 (H3). An accompanying set of numerical [...]

Optimal experiment design for bottom friction parameter estimation

Simon Warder, Matthew D Piggott

Published: 2021-04-23
Subjects: Design of Experiments and Sample Surveys, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

It is common practice within numerical coastal ocean modelling to perform model calibration with respect to a bottom friction parameter. While many modelling studies employ a spatially uniform coefficient, within the parameter estimation literature the coefficient is typically taken to be spatially (or even temporally) varying. A parameter estimation experiment requires an appropriate set of [...]

Deformation of the western Andes at ~20–22°S: a contribution to the quantification of crustal shortening

Tania Habel, Robin Lacassin, Martine Simoes, Daniel Carrizo, Germán Aguilar

Published: 2021-04-23
Subjects: Earth Sciences, Physical Sciences and Mathematics

The Andes are an emblematic active Cordilleran orogen. It is admitted that mountain-building in the Central Andes, at ~20°S, started ~50–60 Myr ago, along the subduction margin, and propagated eastward. In general, the structures sustaining the uplift of the western flank of the Andes are dismissed, and their contribution to mountain-building remains poorly solved. Here, we focus on two sites [...]

Experimental Determination of Mantle Solidi and Melt Compositions for Two Likely Rocky Exoplanet Compositions

Karalee Brugman, Mitchell Phillips, Christy Till

Published: 2021-04-22
Subjects: Physical Sciences and Mathematics

For rocky exoplanets, knowledge of their geologic characteristics such as composition and mineralogy, surface recycling mechanisms, and volcanic behavior are key to determining their suitability to host life. Thus, determining exoplanet habitability requires an understanding of surface chemistry, and understanding the composition of exoplanet surfaces necessitates applying methods from the field [...]

Bridging spatiotemporal scales of normal fault growth using numerical models of continental extension

Sophie Pan, John Naliboff, Rebecca E. Bell, Chris Jackson

Published: 2021-04-21
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Other Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure

Continental extension is accommodated by the development of kilometre-scale normal faults, which grow by accumulating metre-scale earthquake slip over millions of years. Reconstructing the entire lifespan of a fault remains challenging due to a lack of observational data of appropriate scale, particularly over intermediate timescales (10^4-10^6 yrs). Using 3D numerical simulations of continental [...]


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