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Articles 391 - 420 of 3204
Full-Text Articles in Earth Sciences
Authigenic Ferrimagnetic Iron Sulfide Preservation Due To Nonsteady State Diagenesis: A Perspective From Perseverance Drift, Northwestern Weddell Sea, Brendan T. Reilly, Michael L. Mccormick, Stefanie A. Brachfeld, Brian A. Haley
Authigenic Ferrimagnetic Iron Sulfide Preservation Due To Nonsteady State Diagenesis: A Perspective From Perseverance Drift, Northwestern Weddell Sea, Brendan T. Reilly, Michael L. Mccormick, Stefanie A. Brachfeld, Brian A. Haley
Department of Earth and Environmental Studies Faculty Scholarship and Creative Works
We document magnetic mineral diagenesis with high-resolution magnetic susceptibility, hysteresis, isothermal remanent magnetization, and other rock magnetic measurements through a shallow sulfate-methane transition (SMT) at Perseverance Drift—a high-accumulation rate Holocene biosiliceous Antarctic marine sediment deposit. The structure of the SMT is defined with porewater measurements from the same core, allowing direct comparison. Dissolution of the detrital (titano)magnetite assemblage, with preferential dissolution of stochiometric magnetite, occurs in the upper SMT. Higher coercivity magnetic minerals dissolve more slowly, continuing to dissolve through the entire SMT and could be a source of ferric iron for microbial respiration following exhaustion of porewater sulfate, as …
A Solution For Funding The Development Of Technology In Oilwell Drilling, Dalmo S. Amorim, Otto L. A. Santos, Ricardo C. Azevedo, Ana Carolina Chieregati
A Solution For Funding The Development Of Technology In Oilwell Drilling, Dalmo S. Amorim, Otto L. A. Santos, Ricardo C. Azevedo, Ana Carolina Chieregati
Faculty Publications
This article proposes a novel methodology to solve an existing gap in benchmark definition by the adoption of statistically defined benchmarks as references to test products or technical procedures. In a win-win partnership, remuneration is made upon realistic bases of comparison being proportional to existing risks. However, establishing values for benchmarks is rarely unanimous if asked to different persons involved in drilling analysis. Conventional benchmarking, which enhances few results and leaves aside poor operational performances, produces references that do not properly represent the geological environment. Nonetheless, when testing new products, it serves as reference to remunerate suppliers. The review of …
Sharp Contrasts In Observed And Modeled Crevasse Patterns At Greenland’S Marine Terminating Glaciers, Ellyn M. Enderlin, Timothy C. Bartholomaus
Sharp Contrasts In Observed And Modeled Crevasse Patterns At Greenland’S Marine Terminating Glaciers, Ellyn M. Enderlin, Timothy C. Bartholomaus
Geosciences Faculty Publications and Presentations
Crevasses are affected by and affect both the stresses and the surface mass balance of glaciers. These effects are brought on through potentially important controls on meltwater routing, glacier viscosity, and iceberg calving, yet there are few direct observations of crevasse sizes and locations to inform our understanding of these interactions. Here we extract depth estimates for the visible portion of crevasses from high-resolution surface elevation observations for 52 644 crevasses from 19 Greenland glaciers. We then compare our observed depths with those calculated using two popular models that assume crevasse depths are functions of local stresses: the Nye and …
Introduction To Special Section: Integrated Geophysical Imaging, Irina Filina, Rao Yalamanchili, Simone Re, Daniele Colombo, Antony Price, Vsevolod Egorov, Guimin Liu
Introduction To Special Section: Integrated Geophysical Imaging, Irina Filina, Rao Yalamanchili, Simone Re, Daniele Colombo, Antony Price, Vsevolod Egorov, Guimin Liu
Department of Earth and Atmospheric Sciences: Faculty Publications
This special section illustrates the value of integration with nonseismic geophysical methods, namely potential fields (gravity and magnetics) and electric and electromagnetic techniques. The primary objective is to overcome the overall underappreciation of these methods as exploration tools. We provide their brief overview and present nine case studies illustrating how the integrative approach to geophysical data analysis influences the overall result and reduces the uncertainty of the derived solution.
Marine Wild-Capture Fisheries After Nuclear War, Kim J. N. Scherrer, Cheryl S. Harrison, Ryan F. Heneghan, Eric Galbraith, Charles G. Bardeen, Joshua Coupe, Jonas Jägermeyr, Nicole S. Lovenduski, August Luna, Alan Robock, Jessica Stevens, Samantha Stevenson, Owen B. Toon, Lili Xia
Marine Wild-Capture Fisheries After Nuclear War, Kim J. N. Scherrer, Cheryl S. Harrison, Ryan F. Heneghan, Eric Galbraith, Charles G. Bardeen, Joshua Coupe, Jonas Jägermeyr, Nicole S. Lovenduski, August Luna, Alan Robock, Jessica Stevens, Samantha Stevenson, Owen B. Toon, Lili Xia
School of Earth, Environmental, & Marine Sciences Faculty Publications
Nuclear war, beyond its devastating direct impacts, is expected to cause global climatic perturbations through injections of soot into the upper atmosphere. Reduced temperature and sunlight could drive unprecedented reductions in agricultural production, endangering global food security. However, the effects of nuclear war on marine wild-capture fisheries, which significantly contribute to the global animal protein and micronutrient supply, remain unexplored. We simulate the climatic effects of six war scenarios on fish biomass and catch globally, using a state-of-the-art Earth system model and global process-based fisheries model. We also simulate how either rapidly increased fish demand (driven by food shortages) or …
Groundwater Withdrawal Prediction Using Integrated Multitemporal Remote Sensing Data Sets And Machine Learning, S. Majumdar, Ryan G. Smith, J. J. Butler, V. Lakshmi
Groundwater Withdrawal Prediction Using Integrated Multitemporal Remote Sensing Data Sets And Machine Learning, S. Majumdar, Ryan G. Smith, J. J. Butler, V. Lakshmi
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Effective monitoring of groundwater withdrawals is necessary to help mitigate the negative impacts of aquifer depletion. In this study, we develop a holistic approach that combines water balance components with a machine learning model to estimate groundwater withdrawals. We use both multitemporal satellite and modeled data from sensors that measure different components of the water balance and land use at varying spatial and temporal resolutions. These remote sensing products include evapotranspiration, precipitation, and land cover. Due to the inherent complexity of integrating these data sets and subsequently relating them to groundwater withdrawals using physical models, we apply random forests -- …
Drastic Vegetation Change In The Guajira Peninsula (Colombia) During The Neogene, Carlos Jaramillo, Pierre Sepulchre, Damian Cardenas, Francisca Oboh-Ikuenobe, For Full List Of Authors, See Publisher's Website.
Drastic Vegetation Change In The Guajira Peninsula (Colombia) During The Neogene, Carlos Jaramillo, Pierre Sepulchre, Damian Cardenas, Francisca Oboh-Ikuenobe, For Full List Of Authors, See Publisher's Website.
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Dry biomes occupy ~35% of the landscape in the Neotropics, but these are heavily human-disturbed. In spite of their importance, we still do not fully understand their origins and how they are sustained. The Guajira Peninsula in northern Colombia is dominated by dry biomes and has a rich Neogene fossil record. Here, we have analyzed its changes in vegetation and precipitation during the Neogene using a fossil pollen and spore dataset of 20 samples taken from a well and we also dated the stratigraphic sequence using microfossils. In addition, we analyzed the pollen and spore contents of 10 Holocene samples …
Twitter Reveals Human Mobility Dynamics During The Covid-19 Pandemic, Xiao Huang, Zhenlong Li, Yuqin Jiang, Xiaoming Li, Dwayne Porter
Twitter Reveals Human Mobility Dynamics During The Covid-19 Pandemic, Xiao Huang, Zhenlong Li, Yuqin Jiang, Xiaoming Li, Dwayne Porter
Geosciences Faculty Publications and Presentations
The current COVID-19 pandemic raises concerns worldwide, leading to serious health, economic, and social challenges. The rapid spread of the virus at a global scale highlights the need for a more harmonized, less privacy-concerning, easily accessible approach to monitoring the human mobility that has proven to be associated with viral transmission. In this study, we analyzed over 580 million tweets worldwide to see how global collaborative efforts in reducing human mobility are reflected from the user-generated information at the global, country, and U.S. state scale. Considering the multifaceted nature of mobility, we propose two types of distance: the single-day distance …
Potential Virus-Mediated Nitrogen Cycling In Oxygen-Depleted Oceanic Waters, M. Consuelo Gazitúa, Dean R. Vik, Simon Roux, Ann C. Gregory, Benjamin Bolduc, Brittany Widner, Margaret R. Mulholland, Steven J. Hallam, Osvaldo Ulloa, Matthew B. Sullivan
Potential Virus-Mediated Nitrogen Cycling In Oxygen-Depleted Oceanic Waters, M. Consuelo Gazitúa, Dean R. Vik, Simon Roux, Ann C. Gregory, Benjamin Bolduc, Brittany Widner, Margaret R. Mulholland, Steven J. Hallam, Osvaldo Ulloa, Matthew B. Sullivan
OES Faculty Publications
Viruses play an important role in the ecology and biogeochemistry of marine ecosystems. Beyond mortality and gene transfer, viruses can reprogram microbial metabolism during infection by expressing auxiliary metabolic genes (AMGs) involved in photosynthesis, central carbon metabolism, and nutrient cycling. While previous studies have focused on AMG diversity in the sunlit and dark ocean, less is known about the role of viruses in shaping metabolic networks along redox gradients associated with marine oxygen minimum zones (OMZs). Here, we analyzed relatively quantitative viral metagenomic datasets that profiled the oxygen gradient across Eastern Tropical South Pacific (ETSP) OMZ waters, assessing whether OMZ …
Under-Ice Phytoplankton Blooms: Shedding Light On The "Invisible" Part Of Arctic Primary Production, Mathieu Ardyna, C. J. Mundy, Nicolas Mayot, Lisa C. Matthes, Laurent Oziel, Christopher Horvat, Eva Leu, Philipp Assmy, Victoria Hill, Patricia A. Matrai, Matthew Gale, Igor A. Melnikov, Kevin R. Arrigo
Under-Ice Phytoplankton Blooms: Shedding Light On The "Invisible" Part Of Arctic Primary Production, Mathieu Ardyna, C. J. Mundy, Nicolas Mayot, Lisa C. Matthes, Laurent Oziel, Christopher Horvat, Eva Leu, Philipp Assmy, Victoria Hill, Patricia A. Matrai, Matthew Gale, Igor A. Melnikov, Kevin R. Arrigo
OES Faculty Publications
The growth of phytoplankton at high latitudes was generally thought to begin in open waters of the marginal ice zone once the highly reflective sea ice retreats in spring, solar elevation increases, and surface waters become stratified by the addition of sea-ice melt water. In fact, virtually all recent large-scale estimates of primary production in the Arctic Ocean (AO) assume that phytoplankton production in the water column under sea ice is negligible. However, over the past two decades, an emerging literature showing significant under-ice phytoplankton production on a pan-Arctic scale has challenged our paradigms of Arctic phytoplankton ecology and phenology. …
Impacts Of Climate Change On Regulated And Non‐Regulated Water Systems In Australia, David H. Cobon, N. R. Toombs
Impacts Of Climate Change On Regulated And Non‐Regulated Water Systems In Australia, David H. Cobon, N. R. Toombs
IGC Proceedings (1977-2023)
No abstract provided.
Integration Of Ikonos Data In Assessing The Dynamics Of The Range Ecosystems Of The Manzla Watershed (Tangier, Morocco), Mohammed Mejjati Alami, Abdelaziz Merzouk
Integration Of Ikonos Data In Assessing The Dynamics Of The Range Ecosystems Of The Manzla Watershed (Tangier, Morocco), Mohammed Mejjati Alami, Abdelaziz Merzouk
IGC Proceedings (1977-2023)
No abstract provided.
P And N Content Of Surface And Subsurface Water Flows In Limestone Soil, Abdulfatah F. Aboufayed
P And N Content Of Surface And Subsurface Water Flows In Limestone Soil, Abdulfatah F. Aboufayed
IGC Proceedings (1977-2023)
No abstract provided.
Modelling Native Pasture Hydrology At The Catchment Scale, A. F. Southwell, C. R. Beverly, James M. Virgona
Modelling Native Pasture Hydrology At The Catchment Scale, A. F. Southwell, C. R. Beverly, James M. Virgona
IGC Proceedings (1977-2023)
No abstract provided.
Assess Physical Functioning Of Riparian Systems With An Eye Toward Management, Sherman Swanson, Sandra Wyman, Kent Mcadoo
Assess Physical Functioning Of Riparian Systems With An Eye Toward Management, Sherman Swanson, Sandra Wyman, Kent Mcadoo
IGC Proceedings (1977-2023)
No abstract provided.
Synthesis And Ftir Characterization Of Mg-Hydroxylapatite Derived From Dolostone With High Dolomite Mineral Content, Wilson L. Mahene, Charles Gervas, Askwar H. Hilonga, Revocatus L. Machunda
Synthesis And Ftir Characterization Of Mg-Hydroxylapatite Derived From Dolostone With High Dolomite Mineral Content, Wilson L. Mahene, Charles Gervas, Askwar H. Hilonga, Revocatus L. Machunda
Tanzania Journal of Science
We present the synthesis of magnesium-substituted hydroxylapatite starting from locally available dolostone. The apatite was prepared by a reaction between heat pre-treated dolostone powder with phosphoric acid, maintained at the pH of 12.5 using sodium hydroxide. The resultant material was then calcined at 500 °C, 600 °C, 700 °C, 800 °C and 900 °C. The precursor dolostone was characterized by organic elemental analyser (CHNS-O analyser), X-ray fluorescence (XRF) and Fourier transform infrared spectroscopy (FTIR), while the synthesized material was characterized by using FTIR. Results indicated that the dominant mineral in the carbonate rock materials was near-stoichiometric dolomite, while the synthesized …
Geological And Geochemical Characterisation Of Pegmatites Around Olode, Southwestern Nigeria, Razak O. Jimoh, Akinade S. Olatunji
Geological And Geochemical Characterisation Of Pegmatites Around Olode, Southwestern Nigeria, Razak O. Jimoh, Akinade S. Olatunji
Tanzania Journal of Science
Olode is prolific in terms of pegmatites, occurring in different ways as large intrusive bodies, as veins and dykes, discordantly intruding the host rocks of mica schist, gneiss and granite. This study is aimed at the geological and geochemical characterisation of pegmatites around Olode. Field investigation was undertaken to determine the occurrences and relationships of the pegmatites with the host rocks. Fresh pegmatite samples were studied petrographically and geochemically. Two main lithologically and chronologically different groups of pegmatites were distinguishable in the study area. These were the tourmaline pegmatites associated with the Older Granite rocks and the NE-SW trending beryl-bearing …
Coal Exploration Using Electrical Resistivity Method In Some Parts Of Benue Trough, Nigeria, Saminu Olatunji, Abdulgafar T. Jimoh
Coal Exploration Using Electrical Resistivity Method In Some Parts Of Benue Trough, Nigeria, Saminu Olatunji, Abdulgafar T. Jimoh
Tanzania Journal of Science
Geoelectrical resistivity sounding technique was used to delineate the occurrence and extents of coal seam. Fifteen points were sounded with Schlumberger configuration in the suspected coal deposit site bounded by longitudes 7.344° E and 7.366° E, and latitudes 7.318° N and 7.33° N. The vertical electrical sounding (VES) data were analyzed and the corresponding geo-electric parameters at various depths were modeled. The earth model within the study area was correlated with available lithology of a nearby mine site. The sounding signatures are KQHK and KHK curve types which revealed five to six distinct geo-electrical equivalent layers. The wet to dry …
Sensitivity Analysis And Uncertainty Parameter Quantification In A Regression Model: The Case Of Deforestation In Tanzania, Thadei Sagamiko, Nyimvua Shaban, Isambi S. Mbalawata
Sensitivity Analysis And Uncertainty Parameter Quantification In A Regression Model: The Case Of Deforestation In Tanzania, Thadei Sagamiko, Nyimvua Shaban, Isambi S. Mbalawata
Tanzania Journal of Science
In this paper a multiple regression model for the economic factors and policy that influence the rate of deforestation in Tanzania is formulated. Sensitivity analysis for parameters of explanatory variables using one-at-a time and direct methods is carried out and the model is fitted by classical least square (LSQ) and Markov Chain Monte Carlo (MCMC) methods. Uncertainty quantification of parameters by adaptive Markov Chain Monte Carlo methods is performed. The coefficient of determination indicates that 87% of deforestation rate is explained by explanatory variables captured in the model. Household poverty rate is found to be the most sensitive factor to …
Correlation Analysis Of Precipitation And River Flow With The Injection And Discharge Of The Three Gorges Dam And Reservoir, Lirong Yin
LSU Master's Theses
The Yangtze River has been the primary support of the resources and transportation of China. Its basin covers an area of 1.8 million square kilometers. The Three Gorges Dam and Reservoir on the Yangtze River is one of the world's largest dams. After the dam construction in 1997, the reservoir started injecting the reservoir to a size of over 600 km2. The influence caused by the dam and reservoir on the river system has been overwhelming and destructive. The possible influence of this vast water body and the operation to maintain this waterbody's size and water level on …
Mobilisation And Transport Of Sediments, Colloids And Phosphorus From Intensively Managed Grasslands, Gary S. Bilotta, R. E. Brazier, P. M. Haygarth, C. J. A. Macleod, S. Granger, J. Hawkins, T. Krueger, J. Freer, J. Quinton
Mobilisation And Transport Of Sediments, Colloids And Phosphorus From Intensively Managed Grasslands, Gary S. Bilotta, R. E. Brazier, P. M. Haygarth, C. J. A. Macleod, S. Granger, J. Hawkins, T. Krueger, J. Freer, J. Quinton
IGC Proceedings (1977-2023)
No abstract provided.
Water Fluxes In The Xilin River Catchment, Inner Mongolia, At Different Scales, Frauke Barthold, Katrin Schneider, Jinkui Wu, Benjamin Blank, Lutz Breuer, Kellie B. Vaché, Christian Bernhofer, Rainer Horn, Stephan Peth, Hans‐Georg Frede
Water Fluxes In The Xilin River Catchment, Inner Mongolia, At Different Scales, Frauke Barthold, Katrin Schneider, Jinkui Wu, Benjamin Blank, Lutz Breuer, Kellie B. Vaché, Christian Bernhofer, Rainer Horn, Stephan Peth, Hans‐Georg Frede
IGC Proceedings (1977-2023)
No abstract provided.
Partitioning Of Evapotranspiration In Four Grassland Ecosystems With A Two Source Model, Zhongmin Hu, Guirui Yu, Xiaomin Sun
Partitioning Of Evapotranspiration In Four Grassland Ecosystems With A Two Source Model, Zhongmin Hu, Guirui Yu, Xiaomin Sun
IGC Proceedings (1977-2023)
No abstract provided.
Applications Of Near Infrared Reflectance Spectroscopy In Grassland Science, Yan Liang, He Zhou
Applications Of Near Infrared Reflectance Spectroscopy In Grassland Science, Yan Liang, He Zhou
IGC Proceedings (1977-2023)
No abstract provided.
Measurement Of Remote Sensing In Desert Plants Recovery, Xia Li, Ting Niu, Yebiao Yin
Measurement Of Remote Sensing In Desert Plants Recovery, Xia Li, Ting Niu, Yebiao Yin
IGC Proceedings (1977-2023)
No abstract provided.
Geoinformatics Application To Investigate Agricultural Potential In The Cholistan Desert, Farooq Ahmad
Geoinformatics Application To Investigate Agricultural Potential In The Cholistan Desert, Farooq Ahmad
IGC Proceedings (1977-2023)
No abstract provided.
Application Of Fractal On Ecosystem In Grassland, Yaxin Chen, Bing Xu, Kezhen Guo, Quanming Liu
Application Of Fractal On Ecosystem In Grassland, Yaxin Chen, Bing Xu, Kezhen Guo, Quanming Liu
IGC Proceedings (1977-2023)
No abstract provided.
Radiological Identification Of Near‐Surface Mineralogical Deposits Using Low‐Altitude Unmanned Aerial Vehicle, Peter G. Martin, Dean T. Connor, Natalia Estrada, Adel El-Turke, David Megson-Smith, Chris P. Jones, David K. Kreamer, Thomas B. Scott
Radiological Identification Of Near‐Surface Mineralogical Deposits Using Low‐Altitude Unmanned Aerial Vehicle, Peter G. Martin, Dean T. Connor, Natalia Estrada, Adel El-Turke, David Megson-Smith, Chris P. Jones, David K. Kreamer, Thomas B. Scott
Geoscience Faculty Research
An ever‐increasing global population and unabating technological growth have resulted in a relentless appetite for mineral resources, namely rare earth elements, fuel minerals and those utilised in electronics applications, with the price of such species continuing to climb. In contrast to more established large‐scale and high‐cost exploration methodologies, this work details the application of novel multi‐rotor unmanned aerial vehicles equipped with miniaturised radiation detectors for the objective of undertaking resource exploration at lower costs, with greater autonomy and at considerably enhanced higher spatial resolutions; utilizing the ore material’s inherent low levels of characteristic radioactivity. As we demonstrate at the former …
Assessment And Integration Of Socioeconomic And Demographic Factors In The Implementation Of Integrated Water Resources Management In The Lake Chad Basin, Nodjidoumde Mbaigoto
Assessment And Integration Of Socioeconomic And Demographic Factors In The Implementation Of Integrated Water Resources Management In The Lake Chad Basin, Nodjidoumde Mbaigoto
USF Tampa Graduate Theses and Dissertations
Most developing countries have responded to the 2002 World Summit on Sustainable Development (WSSD) call to implement Integrated Water Resources Management (IWRM) in their national water policy to reach water sustainability and socioeconomic welfare. Despite the Lake Chad Basin Commission's adoption of the IWRM principles, the basin experiences a massive humanitarian crisis driven by the lake's shrinkage, the water shortage for food production, the rapid population growth, and the terrorist attacks perpetrated by Boko Haram. This study sought to assess the socioeconomic and demographic status of people living upstream of Lake Chad in order to understand the challenges associated with …
Grassland And Water Resources: Recent Trends And Future Challenges In Temperate Zones, Benoît Marc
Grassland And Water Resources: Recent Trends And Future Challenges In Temperate Zones, Benoît Marc
IGC Proceedings (1977-2023)
No abstract provided.