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Articles 1 - 30 of 30
Full-Text Articles in Physical Sciences and Mathematics
Receiver Function Analyses Of Uturuncu Volcano, Bolivia And Vicinity, Heather Mcfarlin, Douglas Christensen, Stephen R. Mcnutt, Kevin M. Ward, Jamie Ryan, George Zandt, Glenn Thompson
Receiver Function Analyses Of Uturuncu Volcano, Bolivia And Vicinity, Heather Mcfarlin, Douglas Christensen, Stephen R. Mcnutt, Kevin M. Ward, Jamie Ryan, George Zandt, Glenn Thompson
School of Geosciences Faculty and Staff Publications
Uturuncu volcano, located near the borders of Chile and Bolivia in the Central Andes, has been identified as one of two volcanoes in the region with large-scale and active, yet decelerating, inflation. A large low-velocity zone named the Altiplano-Puna magma body (APMB) has been shown to feed magma to Uturuncu and is thought to be a source of the deformation occurring here. The international, multidisciplinary PLUTONS project deployed 28 broadband seismic sensors in a 90 km by 90 km region around and on Uturuncu volcano between April 2010 and October 2012. Over 800 teleseismic receiver functions have been generated and …
A Geophysical Model For The Origin Of Volcano Vent Clusters In A Colorado Plateau Volcanic Field, Fanghui Deng, Charles B. Connor, Rocco Malservisi, Laura J. Connor, Jeremy White, Aurélie Germa, Paul H. Wetmore
A Geophysical Model For The Origin Of Volcano Vent Clusters In A Colorado Plateau Volcanic Field, Fanghui Deng, Charles B. Connor, Rocco Malservisi, Laura J. Connor, Jeremy White, Aurélie Germa, Paul H. Wetmore
School of Geosciences Faculty and Staff Publications
Variation in spatial density of Quaternary volcanic vents, and the occurrence of vent clusters, correlates with boundaries in Proterozoic crust in the Springerville volcanic field (SVF), Arizona, USA. Inverse modeling using 538 gravity measurements shows that vent clusters correlate with gradients in the gravity field due to lateral variation in crustal density. These lateral discontinuities in the crustal density can be explained by boundaries in the North American crust formed during Proterozoic accretion. Spatial density of volcanic vents is low in regions of high‐density Proterozoic crust, high in areas of relatively low density Proterozoic crust, and is greatest adjacent to …
Climatic Control On Icelandic Volcanic Activity During The Mid-Holocene, Graeme T. Swindles, Elizabeth J. Watson, Ivan P. Savov, Ian T. Lawson, Anja Schmidt, Andrew Hooper, Claire L. Cooper, Charles B. Connor, Manuel Gloor, Jonathan L. Carrivick
Climatic Control On Icelandic Volcanic Activity During The Mid-Holocene, Graeme T. Swindles, Elizabeth J. Watson, Ivan P. Savov, Ian T. Lawson, Anja Schmidt, Andrew Hooper, Claire L. Cooper, Charles B. Connor, Manuel Gloor, Jonathan L. Carrivick
School of Geosciences Faculty and Staff Publications
Human-induced climate change is causing rapid melting of ice in many volcanically active regions. Over glacial-interglacial time scales changes in surface loading exerted by large variations in glacier size affect the rates of volcanic activity. Numerical models suggest that smaller changes in ice volume over shorter time scales may also influence rates of mantle melt generation. However, this effect has not been verified in the geological record. Furthermore, the time lag between climatic forcing and a resultant change in the frequency of volcanic eruptions is unknown. We present empirical evidence that the frequency of volcanic eruptions in Iceland was affected …
Darwin Day In Deep Time: Promoting Evolutionary Science Through Paleontology, Sarah L. Sheffield, Jennifer E. Bauer
Darwin Day In Deep Time: Promoting Evolutionary Science Through Paleontology, Sarah L. Sheffield, Jennifer E. Bauer
School of Geosciences Faculty and Staff Publications
Charles Darwin’s birthday, February 12th, is an international celebration coined Darwin Day. During the week of his birthday, universities, museums, and science-oriented organizations worldwide host events that celebrate Darwin’s scientific achievements in evolutionary biology. The University of Tennessee, Knoxville (UT) has one of the longest running celebrations in the nation, with 2016 marking the 19th year. For 2016, the theme for our weeklong series of events was paleontology, chosen to celebrate new research in the field and to highlight the specific misconceptions of evolution within the context of geologic time. We provide insight into the workings of one of our …
Nuisance Flooding And Relative Sea-Level Rise: The Importance Of Present-Day Land Motion, Makan A. Karegar, Timothy H. Dixon, Rocco Malservisi, Jurgen Kusche, Simon E. Engelhart
Nuisance Flooding And Relative Sea-Level Rise: The Importance Of Present-Day Land Motion, Makan A. Karegar, Timothy H. Dixon, Rocco Malservisi, Jurgen Kusche, Simon E. Engelhart
School of Geosciences Faculty and Staff Publications
Sea-level rise is beginning to cause increased inundation of many low-lying coastal areas. While most of Earth’s coastal areas are at risk, areas that will be affected first are characterized by several additional factors. These include regional oceanographic and meteorological effects and/or land subsidence that cause relative sea level to rise faster than the global average. For catastrophic coastal flooding, when wind-driven storm surge inundates large areas, the relative contribution of sea-level rise to the frequency of these events is difficult to evaluate. For small scale “nuisance flooding,” often associated with high tides, recent increases in frequency are more clearly …
Catchment-Scale Alder Cover Controls Nitrogen Fixation In Boreal Headwater Streams, Daniel L. Hiatt, Caleb J. Robbins, Jeffrey A. Back, Pamela K. Kostka, Robert D. Doyle, Coowe M. Walker, Mark C. Rains, Dennis F. Whigham, Ryan S. King
Catchment-Scale Alder Cover Controls Nitrogen Fixation In Boreal Headwater Streams, Daniel L. Hiatt, Caleb J. Robbins, Jeffrey A. Back, Pamela K. Kostka, Robert D. Doyle, Coowe M. Walker, Mark C. Rains, Dennis F. Whigham, Ryan S. King
School of Geosciences Faculty and Staff Publications
Alder (Alnus spp.) is a woody plant with bacterial symbionts that fix atmospheric N2into bioavailable N. We studied 12 North American boreal headwater streams spanning a steep gradient of catchment alder cover (0–27%) to test the hypothesis that increasing inputs of inorganic N associated with increasing alder cover would reduce or eliminate in-stream benthic N2 fixation. We measured N2 fixation rates, chlorophyll a, and ash-free dry mass (AFDM) of periphyton in early (May) and late (August) summer 2011. Dissolved inorganic N (DIN) concentrations, composed almost entirely of NO3/NO2-N, ranged from below detection limits to nearly 2 mg/L and …
Acquisition Of A 3 Min, Two-Dimensional Glacier Velocity Field With Terrestrial Radar Interferometry, Denis Voytenko, Timothy H. Dixon, David M. Holland, Ryan Cassotto, Ian M. Howat, Mark A. Fahnestock, Martin Truffer, Santiago De La Pena
Acquisition Of A 3 Min, Two-Dimensional Glacier Velocity Field With Terrestrial Radar Interferometry, Denis Voytenko, Timothy H. Dixon, David M. Holland, Ryan Cassotto, Ian M. Howat, Mark A. Fahnestock, Martin Truffer, Santiago De La Pena
School of Geosciences Faculty and Staff Publications
Outlet glaciers undergo rapid spatial and temporal changes in flow velocity during calving events. Observing such changes requires both high temporal and high spatial resolution methods, something now possible with terrestrial radar interferometry. While a single such radar provides line-of-sight velocity, two radars define both components of the horizontal flow field. To assess the feasibility of obtaining the two-dimensional (2-D) flow field, we deployed two terrestrial radar interferometers at Jakobshavn Isbrae, a major outlet glacier on Greenland's west coast, in the summer of 2012. Here, we develop and demonstrate a method to combine the line-of-sight velocity data from two synchronized …
The Significant Surface-Water Connectivity Of “Geographically Isolated Wetlands”, Aram J. K. Calhoun, David M. Mushet, Laurie C. Alexander, Edward S. Dekeyser, Laurie Fowler, Charles R. Lane, Megan W. Lang, Mark C. Rains, Stephen C. Richter, Susan C. Walls
The Significant Surface-Water Connectivity Of “Geographically Isolated Wetlands”, Aram J. K. Calhoun, David M. Mushet, Laurie C. Alexander, Edward S. Dekeyser, Laurie Fowler, Charles R. Lane, Megan W. Lang, Mark C. Rains, Stephen C. Richter, Susan C. Walls
School of Geosciences Faculty and Staff Publications
We evaluated the current literature, coupled with our collective research expertise, on surface-water connectivity of wetlands considered to be “geographically isolated” (sensu Tiner Wetlands 23:494–516, 2003a) to critically assess the scientific foundation of grouping wetlands based on the singular condition of being surrounded by uplands. The most recent research on wetlands considered to be “geographically isolated” shows the difficulties in grouping an ecological resource that does not reliably indicate lack of surface water connectivity in order to meet legal, regulatory, or scientific needs. Additionally, the practice of identifying “geographically isolated wetlands” based on distance from a stream can …
Mantle Dynamics Beneath The Discrete And Diffuse Plate Boundaries Of The Juan De Fuca Plate: Results From Cascadia Initiative Body Wave Tomography, Joseph S. Byrnes, Douglas R. Toomey, Emilie E. E. Hooft, John Nábělek, Jochen Braunmiller
Mantle Dynamics Beneath The Discrete And Diffuse Plate Boundaries Of The Juan De Fuca Plate: Results From Cascadia Initiative Body Wave Tomography, Joseph S. Byrnes, Douglas R. Toomey, Emilie E. E. Hooft, John Nábělek, Jochen Braunmiller
School of Geosciences Faculty and Staff Publications
We use the delay times of teleseismic S phases recorded by ocean bottom seismometers during the plate‐scale Cascadia Initiative community experiment to constrain the heterogeneity of seismic velocity structure beneath young oceanic lithosphere. Our study area covers the entire Juan de Fuca (JdF) and Gorda plates, from their creation at the JdF and Gorda Ridges to their subduction beneath the North American continent, and the entire length of the Blanco transform fault. The range of the observed Vs anomalies requires variations in the melt fraction of the asthenosphere. The data require that low Vsanomalies extend to depths of at …
Slow Slip Events In The Early Part Of The Earthquake Cycle, Nicholas K. Voss, Rocco Malservisi, Timothy H. Dixon, Marino Protti
Slow Slip Events In The Early Part Of The Earthquake Cycle, Nicholas K. Voss, Rocco Malservisi, Timothy H. Dixon, Marino Protti
School of Geosciences Faculty and Staff Publications
In February 2014 a Mw = 7.0 slow slip event (SSE) took place beneath the Nicoya Peninsula, Costa Rica. This event occurred 17 months after the 5 September 2012, Mw = 7.6, earthquake and along the same subduction zone segment, during a period when significant postseismic deformation was ongoing. A second SSE occurred in the middle of 2015, 21 months after the 2014 SSE and 38 months after the earthquake. The recurrence interval for Nicoya SSEs was unchanged by the earthquake. However, the spatial distribution of slip for the 2014 event differed significantly from previous events, having only …
The 2016 North Atlantic Hurricane Season: A Season Of Extremes, Jennifer Collins, David R. Roache
The 2016 North Atlantic Hurricane Season: A Season Of Extremes, Jennifer Collins, David R. Roache
School of Geosciences Faculty and Staff Publications
The 2016 North Atlantic hurricane season had an early start with a rare and powerful storm for January impacting the Azores at hurricane force. Likewise, the end of season heralded Otto which was record breaking in location and intensity being a high‐end Category 2 storm at landfall over southern central America in late November. We show that high precipitable water, positive relative vorticity, and low sea level pressure allowed for conducive conditions. During the season, few storms occurred in the main development region. While some environmental conditions were conducive for formation there (such as precipitable water, relative vorticity, and shear), …
Strain Release At The Trench During Shallow Slow Slip: The Example Of Nicoya Peninsula, Costa Rica, Yan Jiang, Zhen Liu, Earl E. Davis, Susan Y. Schwartz, Timothy H. Dixon, Nicholas K. Voss, Rocco Malservisi, Marino Protti
Strain Release At The Trench During Shallow Slow Slip: The Example Of Nicoya Peninsula, Costa Rica, Yan Jiang, Zhen Liu, Earl E. Davis, Susan Y. Schwartz, Timothy H. Dixon, Nicholas K. Voss, Rocco Malservisi, Marino Protti
School of Geosciences Faculty and Staff Publications
The near‐trench behavior of subduction megathrust faults is critical for understanding earthquake hazard and tsunami generation. The shallow subduction interface is typically located in unconsolidated sediments that are considered too weak to accumulate elastic strain. However, the spectrum of shallow fault slip behavior is still elusive, due in large part to the lack of near‐field observations. Here we combine measurements from seafloor pressure sensors near the trench and an onshore GPS network in a time‐dependent inversion to image the initiation and migration of a well‐documented slow slip event (SSE) in 2007 at the Nicoya Peninsula, Costa Rica. Our results show …
High-Resolution Dem Generation From Multiple Remote Sensing Data Sources For Improved Volcanic Hazard Assessment - A Case Study From Nevado Del Ruiz, Colombia, Fanghui Deng, Mel Rodgers, Tim Dixon, Sylvain J. Charbonnier, Elisabeth Gallant, Nicholas Voss, Surui Xie, Rocco Malservisi, Milton Ordoñez, Cristian López
High-Resolution Dem Generation From Multiple Remote Sensing Data Sources For Improved Volcanic Hazard Assessment - A Case Study From Nevado Del Ruiz, Colombia, Fanghui Deng, Mel Rodgers, Tim Dixon, Sylvain J. Charbonnier, Elisabeth Gallant, Nicholas Voss, Surui Xie, Rocco Malservisi, Milton Ordoñez, Cristian López
School of Geosciences Faculty and Staff Publications
Eruptions of active volcanoes in the presence of snow and ice can cause dangerous floods, avalanches and lahars,threatening millions of people living close to such volcanoes. Colombia’s deadliest volcanic hazard in recordedhistory was caused by Nevado del Ruiz Volcano. On November 13, 1985, a relatively small eruption triggeredenormous lahars, killing over 23,000 people in the city of Armero and 2,000 people in the town of Chinchina.Meltwater from a glacier capping the summit of the volcano was the main contributor to the lahars. From 2010 topresent, increased seismicity, surface deformation, ash plumes and gas emissions have been observed at Nevadodel Ruiz. …
Evolution Characteristics Of Landscape Ecological Risk Patterns In Coastal Zones In Zhejiang Province, China, Jialin Li, Ruiliang Pu, Hongbo Gong, Xu Luo, Mengyao Ye, Baixiang Feng
Evolution Characteristics Of Landscape Ecological Risk Patterns In Coastal Zones In Zhejiang Province, China, Jialin Li, Ruiliang Pu, Hongbo Gong, Xu Luo, Mengyao Ye, Baixiang Feng
School of Geosciences Faculty and Staff Publications
Analyzing evolution characteristics of landscape ecological risk patterns would help establish ecological risk early warning mechanism, reduce the ecological risk probability and promote coastal landscape pattern optimization. In this study, landscape pattern indices were first calculated by using multitemporal Landsat TM images acquired in years 1990, 2000 and 2010, then landscape ecological risk pattern evolution models and the spatiotemporal evolutions of ecological risk patterns of coastal zones in Zhejiang province, China were constructed and analyzed. The results demonstrate that (1) greater changes have taken place in landscape structures during the two decades, and (2) the areas of cropland, sea, woodland …
Holocene Winter Climate Variability In Central And Eastern Europe, Aurel Perşoiu, Bogdan P. Onac, Jonathan G. Wynn, Maarten Blaauw, Monica Ionita, Margareta Hansson
Holocene Winter Climate Variability In Central And Eastern Europe, Aurel Perşoiu, Bogdan P. Onac, Jonathan G. Wynn, Maarten Blaauw, Monica Ionita, Margareta Hansson
School of Geosciences Faculty and Staff Publications
Among abundant reconstructions of Holocene climate in Europe, only a handful has addressed winter conditions, and most of these are restricted in length and/or resolution. Here we present a record of late autumn through early winter air temperature and moisture source changes in East-Central Europe for the Holocene, based on stable isotopic analysis of an ice core recovered from a cave in the Romanian Carpathian Mountains. During the past 10,000 years, reconstructed temperature changes followed insolation, with a minimum in the early Holocene, followed by gradual and continuous increase towards the mid-to-late-Holocene peak (between 4-2 kcal BP), and finally by …
Open Data And Digital Morphology, Thomas G. Davies, Imran A. Rahman, Stephan Lautenschlager, John A. Cunningham, Robert J. Asher, Paul M. Barrett, Karl T. Bates, Stefan Bengtson, Roger B. J. Benson, Doug M. Boyer, José Braga, Jen A. Bright
Open Data And Digital Morphology, Thomas G. Davies, Imran A. Rahman, Stephan Lautenschlager, John A. Cunningham, Robert J. Asher, Paul M. Barrett, Karl T. Bates, Stefan Bengtson, Roger B. J. Benson, Doug M. Boyer, José Braga, Jen A. Bright
School of Geosciences Faculty and Staff Publications
Over the past two decades, the development of methods for visualizing and analysing specimens digitally, in three and even four dimensions, has transformed the study of living and fossil organisms. However, the initial promise that the widespread application of such methods would facilitate access to the underlying digital data has not been fully achieved. The underlying datasets for many published studies are not readily or freely available, introducing a barrier to verification and reproducibility, and the reuse of data. There is no current agreement or policy on the amount and type of data that should be made available alongside studies …
Scaling And Functional Morphology In Strigiform Hind Limbs, Meen A. Madan, Emily J. Rayfield, Jen A. Bright
Scaling And Functional Morphology In Strigiform Hind Limbs, Meen A. Madan, Emily J. Rayfield, Jen A. Bright
School of Geosciences Faculty and Staff Publications
Strigiformes are an order of raptorial birds consisting exclusively of owls: the Tytonidae (barn owls) and the Strigidae (true owls), united by a suite of adaptations aiding a keen predatory lifestyle, including robust hind limb elements modified for grip strength. To assess variation in hind limb morphology, we analysed how the dimensions of the major hind limb elements in subfossil and modern species scaled with body mass. Comparing hind limb element length, midshaft width, and robusticity index (RI: ratio of midshaft width to maximum length) to body mass revealed that femoral and tibiotarsal width scale with isometry, whilst length scales …
City Of Gainesville Urban Forest Ecological Analysis 2016, Michael G. Andreu, David A. Fox, Shawn M. Landry, Robert J. Northrop, Caroline A. Hament
City Of Gainesville Urban Forest Ecological Analysis 2016, Michael G. Andreu, David A. Fox, Shawn M. Landry, Robert J. Northrop, Caroline A. Hament
School of Geosciences Faculty and Staff Publications
No abstract provided.
Mega-Evolutionary Dynamics Of The Adaptive Radiation Of Birds, Christopher R. Cooney, Jen A. Bright, Elliot J. R. Capp, Angela M. Chira, Emma C. Hughes, Christopher J. A. Moody, Lara O. Nouri, Zoë K. Varley, Gavin H. Thomas
Mega-Evolutionary Dynamics Of The Adaptive Radiation Of Birds, Christopher R. Cooney, Jen A. Bright, Elliot J. R. Capp, Angela M. Chira, Emma C. Hughes, Christopher J. A. Moody, Lara O. Nouri, Zoë K. Varley, Gavin H. Thomas
School of Geosciences Faculty and Staff Publications
The origin and expansion of biological diversity is regulated by both developmental trajectories1,2 and limits on available ecological niches3,4,5,6,7. As lineages diversify, an early and often rapid phase of species and trait proliferation gives way to evolutionary slow-downs as new species pack into ever more densely occupied regions of ecological niche space6,8. Small clades such as Darwin’s finches demonstrate that natural selection is the driving force of adaptive radiations, but how microevolutionary processes scale up to shape the expansion of phenotypic diversity over …
Estimating The Frequency Of Volcanic Ash Clouds Over Northern Europe, Elizabeth J. Watson, Graeme T. Swindles, Ivan P. Savov, Ian T. Lawson, Charles B. Connor, J. A. Wilson
Estimating The Frequency Of Volcanic Ash Clouds Over Northern Europe, Elizabeth J. Watson, Graeme T. Swindles, Ivan P. Savov, Ian T. Lawson, Charles B. Connor, J. A. Wilson
School of Geosciences Faculty and Staff Publications
Fine ash produced during explosive volcanic eruptions can be dispersed over a vast area, where it poses a threat to aviation, human health and infrastructure. Here, we focus on northern Europe, which lies in the principal transport direction for volcanic ash from Iceland, one of the most active volcanic regions in the world. We interrogate existing and newly produced geological and written records of past ash fallout over northern Europe in the last 1000 years and estimate the mean return (repose) interval of a volcanic ash cloud over the region to be 44±7 years. We compare tephra records …
A Special Issue Of Geosciences: Mapping And Assessing Natural Disasters Using Geospatial Technologies, Ruiliang Pu
A Special Issue Of Geosciences: Mapping And Assessing Natural Disasters Using Geospatial Technologies, Ruiliang Pu
School of Geosciences Faculty and Staff Publications
No abstract provided.
Writing In Geology To Reduce Math Anxiety, Victor Ricchezza, H. L. Vacher
Writing In Geology To Reduce Math Anxiety, Victor Ricchezza, H. L. Vacher
School of Geosciences Faculty and Staff Publications
Students in GLY 4866: Computational Geology at the University of South Florida learn to solve mathematical problems in a geologic context. Quantitative literacy – a fundamental set of skills and habits of mind – is essential to geologists in any of a variety of occupations, and this course helps prepare students for those careers.
Based on suggestions from prior interviews with alumni, we introduced a detailed reading and writing assignment into the course for fall 2016. Students submitted a general written statement about how the felt about math, and then read The Math Instinct: Why you're a Mathematical Genius (along …
Silicate-Promoted Phosphorylation Of Glycerol In Non-Aqueous Solvents: A Prebiotically Plausible Route To Organophosphates, Maheen Gull, Brian J. Cafferty, Nicholas V. Hud, Matthew A. Pasek
Silicate-Promoted Phosphorylation Of Glycerol In Non-Aqueous Solvents: A Prebiotically Plausible Route To Organophosphates, Maheen Gull, Brian J. Cafferty, Nicholas V. Hud, Matthew A. Pasek
School of Geosciences Faculty and Staff Publications
Phosphorylation reactions of glycerol were studied using different inorganic phosphates such as sodium phosphate, trimetaphosphate (a condensed phosphate), and struvite. The reactions were carried out in two non-aqueous solvents: formamide and a eutectic solvent consisting of choline-chloride and glycerol in a ratio of 1:2.5. The glycerol reacted in formamide and in the eutectic solvent with phosphate to yield its phosphorylated derivatives in the presence of silicates such as quartz sand and kaolinite clay. The reactions were carried out by heating glycerol with a phosphate source at 85 °C for one week and were analyzed by 31P-nuclear magnetic resonance (NMR) spectroscopy …
Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, T. J. White, Charles B. Connor, Laura J. Connor, T. Hasenaka
Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, T. J. White, Charles B. Connor, Laura J. Connor, T. Hasenaka
School of Geosciences Faculty and Staff Publications
An efficient and effective inversion and uncertainty quantification approach is proposed for estimating eruption parameters given a data set collected from a tephra deposit. The approach is model independent and here is applied using Tephra2, a code that simulates advective and dispersive tephra transport and deposition. The Levenburg‐Marquardt algorithm is combined with formal Tikhonov and subspace regularization to invert eruption parameters; a linear equation for conditional uncertainty propagation is used to estimate posterior parameter uncertainty. Both the inversion and uncertainty analysis support simultaneous analysis of the full eruption and wind field parameterization. The combined inversion/uncertainty quantification approach is applied to …
The Acceleration Of Dissolved Cobalt's Ecological Stoichiometry Due To Biological Uptake, Remineralization, And Scavenging In The Atlantic Ocean, Mak A. Saito, Abagail E. Noble, Nicholas Hawco, Benjamin S. Twining, Daniel C. Ohnemus, Seth G. John, Phoebe Lam, Tim M. Conway, Rod Johnson, Dawn Moran, Matthew Mcilvin
The Acceleration Of Dissolved Cobalt's Ecological Stoichiometry Due To Biological Uptake, Remineralization, And Scavenging In The Atlantic Ocean, Mak A. Saito, Abagail E. Noble, Nicholas Hawco, Benjamin S. Twining, Daniel C. Ohnemus, Seth G. John, Phoebe Lam, Tim M. Conway, Rod Johnson, Dawn Moran, Matthew Mcilvin
School of Geosciences Faculty and Staff Publications
The stoichiometry of biological components and their influence on dissolved distributions have long been of interest in the study of the oceans. Cobalt has the smallest oceanic inventory of inorganic micronutrients and hence is particularly vulnerable to influence by internal oceanic processes including euphotic zone uptake, remineralization, and scavenging. Here we observe not only large variations in dCo:P stoichiometry but also the acceleration of those dCo:P ratios in the upper water column in response to several environmental processes. The ecological stoichiometry of total dissolved cobalt (dCo) was examined using data from a US North Atlantic GEOTRACES transect and from a …
Inter-Calibration Of A Proposed New Primary Reference Standard Aa-Eth Zn For Zinc Isotopic Analysis, Corey Archer, Morten B. Anderson, Christophe Cloquet, Tim M. Conway, Shoufei Dong, Michael Ellwood, Rebekah Moore, Joey Nelson, Mark Rehkamper
Inter-Calibration Of A Proposed New Primary Reference Standard Aa-Eth Zn For Zinc Isotopic Analysis, Corey Archer, Morten B. Anderson, Christophe Cloquet, Tim M. Conway, Shoufei Dong, Michael Ellwood, Rebekah Moore, Joey Nelson, Mark Rehkamper
School of Geosciences Faculty and Staff Publications
We have prepared a large volume of pure, concentrated and homogenous zinc standard solution. This new standard solution is intended to be used as a primary reference standard for the zinc isotope community, and to serve as a replacement for the nearly exhausted current reference standard, the so-called JMC-Lyon Zn. The isotopic composition of this new zinc standard (AA-ETH Zn) has been determined through an inter-laboratory calibration exercise, calibrated against the existing JMC-Lyon standard, as well as the certified Zn reference standard IRMM-3702. The data show that the new standard is isotopically indistinguishable from the IRMM-3702 zinc standard, with a …
Evidence Of Long-Term Nao Influence On East-Central Europe Winter Precipitation From A Guano-Derived Δ15N Record, Daniel M. Cleary, Jonathan G. Wynn, Monica Ionita, Ferenc L. Forray, Bogdan P. Onac
Evidence Of Long-Term Nao Influence On East-Central Europe Winter Precipitation From A Guano-Derived Δ15N Record, Daniel M. Cleary, Jonathan G. Wynn, Monica Ionita, Ferenc L. Forray, Bogdan P. Onac
School of Geosciences Faculty and Staff Publications
Currently there is a scarcity of paleo-records related to the North Atlantic Oscillation (NAO), particularly in East-Central Europe (ECE). Here we report δ15N analysis of guano from a cave in NW Romania with the intent of reconstructing past variation in ECE hydroclimate and examine NAO impacts on winter precipitation. We argue that the δ15N values of guano indicate that the nitrogen cycle is hydrologically controlled and the δ15N values likely reflect winter precipitation related to nitrogen mineralization prior to the growing season. Drier conditions indicated by δ15N values at AD 1848–1852 and …
Water In Melt Inclusions From Phenocrysts Of Dacite Pumice Of The Vetrovoy Isthmus (Iturup Island, Southern Kuriles), A. A. Kotov, S. Z. Smirnov, I. A. Maksimovich, P. Y. Plechov, N. V. Chertkova, Aleksei I. Befus
Water In Melt Inclusions From Phenocrysts Of Dacite Pumice Of The Vetrovoy Isthmus (Iturup Island, Southern Kuriles), A. A. Kotov, S. Z. Smirnov, I. A. Maksimovich, P. Y. Plechov, N. V. Chertkova, Aleksei I. Befus
School of Geosciences Faculty and Staff Publications
This work is devoted to the study of one of the largest caldera eruptions of the Kurile-Kamchatka island-arc system that occurred on the island of Iturup. The object of investigation of this work are phenocrysts of quartz and plagioclase from dacite pumice of the Isthmus of the Isthmus, which is located on the island of Iturup. The purpose of this work is to determine the water content in the melts that participated in the caldera eruption of the Vetrovoy Isthmus and the patterns of their changes during the crystallization of magma. In the course of the work, the following were …
The Importance Of Traditional Ecological Knowledge In Agroecological Systems In Peru, Christina R. Saylor, Kamal Alsharif, Hannah Torres
The Importance Of Traditional Ecological Knowledge In Agroecological Systems In Peru, Christina R. Saylor, Kamal Alsharif, Hannah Torres
School of Geosciences Faculty and Staff Publications
This study argues that a critical element in the success of an ecosystem service (ES) approach at any level is the higher qualitative valuation of local traditional ecological knowledge (TEK). As such, the objectives of this research were to illustrate the role of TEK in agroecological systems in Peru and to develop recommendations about this type of knowledge acquisition. The data were gathered using interviews and focus groups with subsistence farmers along with key informant interviews to elicit TEK at local and regional scales in five provinces in the Lake Titicaca region of Puno, Peru. Qualitative analysis revealed dominant themes …
High Speed Imaging, Lightning Mapping Arrays And Thermal Imaging: A Synergy For The Monitoring Of Electrical Discharges At The Onset Of Volcanic Explosions, Damien Gaudin, Corrado Cimarelli, Sonja A. Behnke, Valeria Cigala, Harald E. Edens, Stephen R. Mcnutt, Cassandra M. Smith, Ronald J. Thomas, Alexa R. Van Eaton
High Speed Imaging, Lightning Mapping Arrays And Thermal Imaging: A Synergy For The Monitoring Of Electrical Discharges At The Onset Of Volcanic Explosions, Damien Gaudin, Corrado Cimarelli, Sonja A. Behnke, Valeria Cigala, Harald E. Edens, Stephen R. Mcnutt, Cassandra M. Smith, Ronald J. Thomas, Alexa R. Van Eaton
School of Geosciences Faculty and Staff Publications
Volcanic lightning is being increasingly studied, due to its great potential for the detection and monitoring of ash plumes. Indeed, it is observed in a large number of ash-rich volcanic eruptions and it produces electromagnetic waves that can be detected remotely in all weather conditions. Electrical discharges in volcanic plume can also significantly change the structural, chemical and reactivity properties of the erupted material. Although electrical discharges are detected in various regions of the plume, those happening at the onset of an explosion are of particular relevance for the early warning and the study of volcanic jet dynamics. In order …