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Articles 1 - 15 of 15
Full-Text Articles in Physical Sciences and Mathematics
Quantifying The Basal Conditions Of A Mountain Glacier Using A Targeted Full-Waveform Inversion: Bench Glacier, Alaska, Usa, E. Babcock, J. Bradford
Quantifying The Basal Conditions Of A Mountain Glacier Using A Targeted Full-Waveform Inversion: Bench Glacier, Alaska, Usa, E. Babcock, J. Bradford
John H. Bradford
Glacier dynamics are inextricably linked to the basal conditions of glaciers. Seismic reflection methods can image the glacier bed under certain conditions. However, where a seismically thin layer of material is present at the bed, traditional analyses may fail to fully characterize bed properties. We use a targeted full-waveform inversion algorithm to quantify the basal-layer parameters of a mountain glacier: thickness (d), P-wave velocity (α) and density (ρ). We simultaneously invert for the seismic quality factor (Q) of the bulk glacier ice. The inversion seeks to minimize the difference between the data and a one-dimensional reflectivity algorithm using a gradient-based …
A 70 Year History Of Coastal Dune Migration And Beach Erosion Along The Southern Shore Of Lake Michigan, Zoran Kilibarda, Craig Shillinglaw
A 70 Year History Of Coastal Dune Migration And Beach Erosion Along The Southern Shore Of Lake Michigan, Zoran Kilibarda, Craig Shillinglaw
Zoran Kilibarda
A study of aerial photographs from the Indiana Dunes National Lakeshore (adjacent to Michigan City, Indiana, United States of America) revealed that from 1938 to 2008 the Lakeshore’s Mount Baldy dune advanced inland 135 m, at an average rate of 1.9 m/year, while the beach north of the dune receded 98 m, at an average rate of 1.4 m/year. The highest rates of Mount Baldy dune movement (3.3 m/year) occurred concurrently (1965–1973) with highest rates of beach erosion (7.2 m/year). The lowest rates of Mount Baldy dune movement (0.3 m/year) occurred in 1958–1965 period. The highest rates of beach accretion …
The 21st Century Library For Geoscientists, Maxine G. Schmidt
The 21st Century Library For Geoscientists, Maxine G. Schmidt
Maxine G Schmidt
No abstract provided.
Mass And Nutrient Loss In Decaying Hardwood Boles At Hubbard Brook, Chris E. Johnson
Mass And Nutrient Loss In Decaying Hardwood Boles At Hubbard Brook, Chris E. Johnson
Chris E Johnson
No abstract provided.
Microbe-Mineral Relationships And Biogenic Mineral Transformations In Actively Venting Deep-Sea Hydrothermal Sulfide Chimneys, Tzihsuan J. Lin
Microbe-Mineral Relationships And Biogenic Mineral Transformations In Actively Venting Deep-Sea Hydrothermal Sulfide Chimneys, Tzihsuan J. Lin
TZIHSUAN J LIN
This dissertation uses a combination of microbiology, mineralogy, and geochemistry to understand dissimilatory iron reduction in hyperthermophilic archaea and the role and potential impact of these and other vent microorganisms within active deep-sea hydrothermal vent chimneys. The central objective of the dissertation is to determine if mineral composition and chimney type are among the primary determinants of microbial community composition and hyperthermophilic, dissimilatory iron reducer growth, in addition to other environmental factors such as nutrient availability, temperature, pH, and chlorinity. This is done using samples and organisms collected from the Endeavour Segment of the Juan de Fuca Ridge in the …
Is Horizon Sampling More Powerful Than Depth Sampling?, Chris E. Johnson
Is Horizon Sampling More Powerful Than Depth Sampling?, Chris E. Johnson
Chris E Johnson
No abstract provided.
Soil Penetrometer, David A. Bainbridge
Soil Penetrometer, David A. Bainbridge
David A Bainbridge
A simple easy to build impact soil penetrometer can provide very useful information on soil strength. This can be very important for restoration planning and management of soils in agriculture and forestry.
Soil Solarization, David A. Bainbridge
Soil Solarization, David A. Bainbridge
David A Bainbridge
Soil solarization makes use of the energy of the sun to heat soil and kill weeds and pathogens. Single, double, or bubblepack plastic and be used to increase soil temperature. Multiple growth benefits are often realized.
Global Meteorological Drought – Part 1: Probabilistic Monitoring, Will Pozzi
Global Meteorological Drought – Part 1: Probabilistic Monitoring, Will Pozzi
Will Pozzi
Near-real-time drought monitoring can provide decision-makers with valuable information for use in se- veral areas, such as water resources management, or inter- national aid. One of the main constrains of assessing the current drought situation is associated with the lack of re- liable sources of observed precipitation on a global scale available in near-real time. Furthermore, monitoring sys- tems also need a long record of past observations to pro- vide mean climatological conditions. To address these prob- lems, a novel probabilistic drought monitoring methodology based on ECMWF probabilistic forecasts is presented, where probabilistic monthly means of precipitation were derived from …
Changing Climate And The Altitudinal Range Of Avian Malaria In The Hawaiian Islands – An Ongoing Conservation Crisis On The Island Of Kaua`I, Carter T. Atkonson, Ruth B. Utzurrum, Dennis A. Lapointe, Richard J. Camp, Lisa H. Crampton, Jeffrey T. Foster, Thomas W. Giambelluca
Changing Climate And The Altitudinal Range Of Avian Malaria In The Hawaiian Islands – An Ongoing Conservation Crisis On The Island Of Kaua`I, Carter T. Atkonson, Ruth B. Utzurrum, Dennis A. Lapointe, Richard J. Camp, Lisa H. Crampton, Jeffrey T. Foster, Thomas W. Giambelluca
Richard J. Camp
Transmission of avian malaria in the Hawaiian Islands varies across altitudinal gradients and is greatest at elevations below 1500 m where both temperature and moisture are favorable for the sole mosquito vector, Culex quinquefasciatus, and extrinsic sporogonic development of the parasite, Plasmodium relictum. Potential consequences of global warming on this system have been recognized for over a decade with concerns that increases in mean temperatures could lead to expansion of malaria into habitats where cool temperatures currently limit transmission to highly susceptible endemic forest birds. Recent declines in two endangered species on the island of Kaua’i, the ‘Akikiki (Oreomystis bairdi) …
Extreme Localized Exhumation At Syntaxes Initiated By Subduction Geometry, Rebecca Bendick
Extreme Localized Exhumation At Syntaxes Initiated By Subduction Geometry, Rebecca Bendick
Rebecca Bendick
No abstract provided.
Changes In Beach Gravel Lithology Caused By Anthropogenic Activities Along The Southern Coast Of Lake Michigan, Usa, Zoran Kilibarda, Nolan Graves, Melissa Dorton, Richard Dorton
Changes In Beach Gravel Lithology Caused By Anthropogenic Activities Along The Southern Coast Of Lake Michigan, Usa, Zoran Kilibarda, Nolan Graves, Melissa Dorton, Richard Dorton
Zoran Kilibarda
The southern coast of Lake Michigan is the most urbanized and most densely populated area in the Great Lakes region. Development of steel mills, harbors, and municipalities in NW Indiana and in NE Illinois in the last century and a half altered the nearshore environment so much that native beach gravel (>8 mm) now exist only in the exhumed paleo-beach remnants from the Nipissing Phase (~4,500 years ago) of Lake Michigan. Native gravel, collected from paleo-beach remnants at Mount Baldy Dune and Beach House Blowout, contain predominantly beach shingle, very platy siltstones (71–78 %), with secondary crystalline pebbles (18 …
The Role Of Extratropical Cyclones In Shaping Dunes Along Southern And Southeastern Lake Michigan, Brian Yurk, Edward Hansen, Suzzanne Devries-Zimmerman, Zoran Kilibarda, Deanna Van Dijk, Brian Bodenbender, A. Krehel, T. Pennings
The Role Of Extratropical Cyclones In Shaping Dunes Along Southern And Southeastern Lake Michigan, Brian Yurk, Edward Hansen, Suzzanne Devries-Zimmerman, Zoran Kilibarda, Deanna Van Dijk, Brian Bodenbender, A. Krehel, T. Pennings
Zoran Kilibarda
This study investigates the impacts of extratropical cyclones on Lake Michigan dune complexes by integrating fi eld measurements and meteorological data from sites along the southeastern shore. Surface changes and wind velocities were monitored at Hoffmaster State Park, Saugatuck Harbor Natural Area, and Mount Baldy at Indiana Dunes National Lakeshore from October to April in 2010–2011 and 2011–2012. Over 70% of the events with wind speeds at least two standard deviations above the mean were associated with extratropical cyclones. The wind directions depended on the cyclone path, with westerly or southerly components most common. Local conditions moderated the effects of …
Arsenic Removal From Soil With High Iron Content Using A Natural Surfactant And Phosphate, Soumyadeep Mukhopadhyay Dr, Mohd Ali Hashim Dr, Matthew Allen Mr, Bhaskar Sen Gupta Dr
Arsenic Removal From Soil With High Iron Content Using A Natural Surfactant And Phosphate, Soumyadeep Mukhopadhyay Dr, Mohd Ali Hashim Dr, Matthew Allen Mr, Bhaskar Sen Gupta Dr
Soumyadeep Mukhopadhyay Dr
An environment friendly arsenic removal technique from contaminated soil with high iron content has been studied. A natural surfactant extracted from soapnut fruit, phosphate solution and their mixture was used separately as extractants. The mixture was most effective in desorbing arsenic, attaining above 70 % efficiency in the pH range of 4–5. Desorption kinetics followed Elovich model. Micellar solubilization by soapnut and arsenic exchange mechanism by phosphate are the probable mechanisms behind arsenic desorption. Sequential extraction reveals that the mixed soapnut–phosphate system is effective in desorbing arsenic associated with amphoteric–Fe-oxide forms. No chemical change to the wash solutions was observed …
Effects Of Wetting Agents And Approaching Anode On Lead Migration In Electrokinetic Soil Remediation, Yee Sern Ng, Bhaskar Sen Gupta, Mohd Ali Hashim
Effects Of Wetting Agents And Approaching Anode On Lead Migration In Electrokinetic Soil Remediation, Yee Sern Ng, Bhaskar Sen Gupta, Mohd Ali Hashim
Ng Yee-Sern
Approaching anode is one of the enhancement techniques in electrokinetic soil remediation. This technique is reported to give promising migration for heavy metals under shorter treatment time and at lower cost in comparison to normal fixed anode system. In the present study, the effectiveness of fixed anode and approaching anode techniques in electrokinetic soil remediation for lead migration under different types of wetting agents (0.01M NaNO3 and 0.1M citric acid) was investigated. The study showed that the use of citric acid enhanced lead migration in comparison to NaNO3. For NaNO3 tests, lead was found to accumulate in the middle of …