Open Access. Powered by Scholars. Published by Universities.®

Environmental Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

16,247 Full-Text Articles 19,925 Authors 2,092,602 Downloads 155 Institutions

All Articles in Environmental Sciences

Faceted Search

16,247 full-text articles. Page 1 of 199.

Reply To ‘Co2 Emissions From Crop Residue-Derived Biofuels’, Adam Liska, Haishun Yang, Matthew P. Pelton, Andrew E. Suyker 2014 University of Nebraska - Lincoln

Reply To ‘Co2 Emissions From Crop Residue-Derived Biofuels’, Adam Liska, Haishun Yang, Matthew P. Pelton, Andrew E. Suyker

Adam Liska Papers

The soil organic carbon (SOC) model that we used was parameterized with data from arable land under normal farming conditions in North America, Europe, Africa and Asia, but the equation is insensitive to changes in tillage, soil texture and moisture. The model has reasonable accuracy, however, in predicting changes in SOC, residue remaining and CO2 emissions from initial SOC, carbon inputs from residue, and daily temperature; the shoot-to-root ratio used in the geospatial simulation was 0.29 (that is, root carbon is 29% of total aboveground carbon), which did not underestimate carbon input to soil (Supplementary Figure 2 in ...


The Figure Of Bitu-Man, Paul Royster 2014 University of Nebraska - Lincoln

The Figure Of Bitu-Man, Paul Royster

Faculty Publications, UNL Libraries

The ominously imposing figure in the above illustration is “the Syncrude bird deterrent device, locally known as ‘Bitu-man’.” He stands (or stood—the original image was from the late 1970s) in the tailings pond of the Syncrude Canada Ltd. oil sands mining operation along the Athabasca River near Fort McMurray in northeastern Alberta. That operation surface mines (i.e., strip mines) bitumen-impregnated sand, processes it with hot water and steam, and discharges the liquid effluent or “tailings” into a pond covering roughly 3000 hectares (11 square miles). (Google Map coordinates: 56.9°N, -111.3° W). Residue bitumen collects on ...


The Status Of Fishes In The Missouri River, Nebraska: Lake Sturgeon (Acipenser Fulvescens), Kirk D. Steffensen, Sam Stukel, Dane A. Shuman 2014 University of Nebraska - Lincoln

The Status Of Fishes In The Missouri River, Nebraska: Lake Sturgeon (Acipenser Fulvescens), Kirk D. Steffensen, Sam Stukel, Dane A. Shuman

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Lake Sturgeon (Acipenser fulvescens) occurrences in the Missouri River along Nebraska’s eastern border are historically sporadic and rare. Presently, the wild Lake Sturgeon population in this river reach may be extirpated. A Recovery Program initiated by the Missouri Department of Conservation (MDC) has stocked almost 150,000 hatchery-reared Lake Sturgeon into the lower Missouri River at several sites in Missouri. As a result, the number of Lake Sturgeon collected has increased. Since monitoring began in 2003, no Lake Sturgeon have been collected above Gavins Point Dam while 40 fish were collected downstream of Gavins Point Dam. The majority of ...


Conesus Lake Fish Stock Assessments 2001-2009, Matthew J. Sanderson 2014 The College at Brockport: State University of New York

Conesus Lake Fish Stock Assessments 2001-2009, Matthew J. Sanderson

Government Documents

Warm water fisheries assessments using standard gangs of gill nets were conducted in Conesus Lake in September of 2001, 2004, and 2009. The purpose of the surveys was to assess the fish community; the contribution of stocked fingerlings to the walleye (Sander vitreus) population; estimate population characteristics of walleye, smallmouth bass (Micropterus dolomieui), and northern pike (Esox lucius); compare fish community structure to previous surveys; and guide the development of appropriate management recommendations. From the 1990’s to the 2000’s, species dominance shifted from walleye to sunfish (Lepomis, sp.), and yellow perch (Perca flavescens) went from being a major ...


Jefferson Current: Autumn Volume 15, Issue 2, 2014, 2014 Thomas Jefferson University

Jefferson Current: Autumn Volume 15, Issue 2, 2014

Jefferson Currents: The Energy Conservation Newsletter

Jefferson Current: Autumn Volume 15, Issue 2, 2014


Jefferson Current: Spring Volume 15, Issue 1, 2014, 2014 Thomas Jefferson University

Jefferson Current: Spring Volume 15, Issue 1, 2014

Jefferson Currents: The Energy Conservation Newsletter

Jefferson Current: Spring Volume 15, Issue 1, 2014


Sustainability Planning, Environmental Justice And Climate Change: Applications Of The Long Island Markal Model, David S. Friedman, Yehuda Klein, Jose Pillich, Michael T. Sullivan 2014 University of South Florida

Sustainability Planning, Environmental Justice And Climate Change: Applications Of The Long Island Markal Model, David S. Friedman, Yehuda Klein, Jose Pillich, Michael T. Sullivan

Suburban Sustainability

As pointed out by many authors, sustainability is often vague and amorphous (See, for example, Dovers, 1989; Faber, et al, 2005; Glavič, et al. 2007). There is a clear need to make analytical and data-driven analyses of established and or proposed plans. MARKAL (MARKet ALlocation model) is an analytical tool that can be used characterize the impacts of sustainability plans at multiple spatial scales: global, national, regional, and local. In this study we apply the Long Island MARKAL model to answer three interrelated issues: 1, the development and incremental improvement of local and regional sustainability plans; 2, the impact of ...


A Regression Approach For Estimation Of Anthropogenic Heat Flux Based On A Bottom-Up Air Pollutant Emission Database, Sang-Hyun Lee, Stuart A. McKeen, David J. Sailor 2014 Portland State University

A Regression Approach For Estimation Of Anthropogenic Heat Flux Based On A Bottom-Up Air Pollutant Emission Database, Sang-Hyun Lee, Stuart A. Mckeen, David J. Sailor

Mechanical and Materials Engineering Faculty Publications and Presentations

A statistical regression method is presented for estimating hourly anthropogenic heat flux (AHF) using an anthropogenic pollutant emission inventory for use in mesoscale meteorological and air-quality modeling. Based on bottom-up AHF estimated from detailed energy consumption data and anthropogenic pollutant emissions of carbon monoxide (CO) and nitrogen oxides (NOx) in the US National Emission Inventory year 2005 (NEI-2005), a robust regression relation between the AHF and the pollutant emissions is obtained for Houston. This relation is a combination of two power functions (Y = aXb) relating CO and NOx emissions to AHF, giving a determinant coefficient (R2 ...


Silence Is The Loudest Sound, Emma Christian 2014 The University of Maine

Silence Is The Loudest Sound, Emma Christian

Honors College

Rhinoceros poaching is an act of killing a rhinoceros in order to take its horn, which is then used for human consumption or for cultural traditions. Both the Asian and the African rhinoceros are targets because of the demand from China, Vietnam, Yemen, and other countries around the world. Traditional Chinese Medicine practice is the main demand for rhinoceros horn and this demand in rhinoceros horn has caused an increase in the black market. Conservation of the rhinoceros is decreasing primarily because the price of rhinoceros horn is more than double the average household income in South Africa, thus making ...


Getches Wilkinson Center Newsletter, Fall 2014, University of Colorado Boulder. Getches Wilkinson Center for Natural Resources, Energy, and the Environment 2014 University of Colorado Law School

Getches Wilkinson Center Newsletter, Fall 2014, University Of Colorado Boulder. Getches Wilkinson Center For Natural Resources, Energy, And The Environment

Getches Wilkinson Center for Natural Resources, Energy, and the Environment Newsletter (2013-)

No abstract provided.


Sediment And Vegetation Monitoring During A Levee Removal Project On The Stillaguamich River Delta At Port Susan Bay, Wa, Alec Barber 2014 Western Washington University

Sediment And Vegetation Monitoring During A Levee Removal Project On The Stillaguamich River Delta At Port Susan Bay, Wa, Alec Barber

WWU Masters Thesis Collection

Sea levels around the world are on the rise in due to the effects of climate change. Coastal wetlands and estuaries are at risk of being submerged as water levels continue to increase, unless they can move inland or gain surface elevation. These wetland systems provide vital ecosystem services that would be difficult or impossible to provide by other means. In the Puget Sound, Washington, 80% of the original estuarine and coastal wetland habitat has been replaced by human infrastructure, making the monitoring, preservation, and restoration of the remaining stock important both ecologically and economically. The objective of this project ...


Precipitation Variability And Nitrogen Deposition Alter Root Distribution In A Tallgrass Prairie, Emmalyn P. Terracciano, Michael Schuster, Jeffrey Dukes 2014 Purdue University

Precipitation Variability And Nitrogen Deposition Alter Root Distribution In A Tallgrass Prairie, Emmalyn P. Terracciano, Michael Schuster, Jeffrey Dukes

The Summer Undergraduate Research Fellowship (SURF) Symposium

Climate change and increases in nitrogen deposition impact ecosystems globally. Projected atmospheric warming allows rain to fall in larger events with longer dry periods in between, increasing rainfall variability in many regions. Concurrently, the combustion of fossil fuels and the heavy use of nitrogen fertilizers continue to increase the availability of nitrogen globally. However, not much is known about how these global change factors, increased rainfall variability and nitrogen deposition, interact with each other to affect ecosystem functions, particularly belowground where root production contributes to soil carbon pools- an important component in regulating climate. In order to study these factors ...


Evaluating Contaminants Of Emerging Concern In Commercial Biosolid-Based Fertilizers, John Hemmerling, Michael L. Mashtare, Linda S. Lee 2014 Purdue University

Evaluating Contaminants Of Emerging Concern In Commercial Biosolid-Based Fertilizers, John Hemmerling, Michael L. Mashtare, Linda S. Lee

The Summer Undergraduate Research Fellowship (SURF) Symposium

The production and popularity of commercially available biosolid-based fertilizers are increasing because of their economic, environmental, and plant nutrition benefits, particularly in urban and suburban areas. Because biosolid-based fertilizers are derived from waste water treatment plant residuals, we hypothesized that there is the potential for micropollutants to persist in these products. Their presence would be of particular concern due to their potential impact on human and ecological health and risk of bioaccumulation. This study involves quantifying contaminants of emerging concern in three biosolid-based fertilizers, and 2 non-biosolid-based fertilizers, a composted animal manure and an organic compost. Our extraction method employed ...


The Status Of Fishes In The Missouri River, Nebraska: Shovelnose Sturgeon (Scaphirhynchus Platorynchus), Kirk D. Steffensen, Sam Stukel, Dane A. Shuman 2014 University of Nebraska - Lincoln

The Status Of Fishes In The Missouri River, Nebraska: Shovelnose Sturgeon (Scaphirhynchus Platorynchus), Kirk D. Steffensen, Sam Stukel, Dane A. Shuman

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

The Shovelnose Sturgeon Scaphirhynchus platorynchus remains the most abundant riverine sturgeon species in North American despite the anthropogenic modifications that have occurred throughout their historic range; however, their populations have declined throughout Nebraska since the construction of Fort Randall and Gavins Point Dams. Therefore, the objective of this study was to present the current status of Shovelnose Sturgeon in the Missouri River along Nebraska’s border. Data was acquired from 2003 to 2012 from all reaches of the Missouri River along Nebraska’s eastern border. Catch rates of Shovelnose Sturgeon increased in a downstream trend and were highest in the ...


Damming Brazil, Thyra Brody 2014 Chapman University

Damming Brazil, Thyra Brody

e-Research: A Journal of Undergraduate Work

Hydroelectric power is often considered a safe and clean alternative to the combustion of fossil fuels. Although the consequences to the air and atmosphere are lower, damming large rivers in the jungles of Brazil have a significant impact on indigenous populations and environmental ecosystems. This article examines such fallout and calls out for equity, and social and environmental justice. As the fuel of the last century burns out the hectic scramble for a tenable alternative is becoming an increasingly serious question mark. We would do well for ourselves, and future generations, to try and solve the environmental issues associated with ...


Utilizing Remote Sensing To Detect Deepwater Horizon Oil Spill Properties, Amanda Kristedja 2014 Chapman University

Utilizing Remote Sensing To Detect Deepwater Horizon Oil Spill Properties, Amanda Kristedja

e-Research: A Journal of Undergraduate Work

This paper focuses on the detection of oil spills using satellite information. ��For this research project, the focus will be primarily on the Deepwater Horizon Oil Spill, which is the largest accidental oil spill. In order to detect an oil spill, the chlorophyll a content must be observed with data from the SeaWiFs at 9km and the MODIS-aqua at 9km and 4km. There is conflicting evidence of whether or not chlorophyll a concentration is positively correlated with the presence of an oil spill. This will be further investigated in the experiment. Also, by utilizing the MODIS instrument aboard the terra ...


Annotated Bibliography: Environmental Education (1998-2013), Erich Yahner 2014 Humane Society Institute for Science and Policy

Annotated Bibliography: Environmental Education (1998-2013), Erich Yahner

Humane Education

No abstract provided.


Promoting Renewable Energy Generation In The United States: The Debate Over Renewable Portfolio Standards, Joe Cerne 2014 University of Puget Sound

Promoting Renewable Energy Generation In The United States: The Debate Over Renewable Portfolio Standards, Joe Cerne

Economics Theses

Incentivizing renewable energy growth in the 21st century is, and will continue to be, a highly debated topic. As of late, legislative initiatives have prompted the enactment of various renewable portfolio standards aimed at stimulating renewable energy growth. Using data regarding each state’s energy production, this paper finds that there is no significant change in renewable energy output following the initiation of a renewable portfolio standard. We conclude that renewable energy growth is virtually unaffected by renewable portfolio standards and as such, we agree with much of the literature implying other means are necessary in order to adequately ...


Determining The Association Between The Structure Of Stream Benthic Macroinvertebrate Communities And Agricultural Best Management Practices, Roger Holmes 2014 Western University

Determining The Association Between The Structure Of Stream Benthic Macroinvertebrate Communities And Agricultural Best Management Practices, Roger Holmes

University of Western Ontario - Electronic Thesis and Dissertation Repository

Farmers have been encouraged to adopt more sustainable farming practices (BMPs) that mitigate adverse agricultural effects on the natural environment. However, the ability of BMPs to protect or restore riverine systems continues to be questioned due to limited evidence directly linking BMP use with improved ecological conditions. The exclusion of hydrological pathways in previous field studies may explain why a direct link has not yet been established. The goal of this study was to assess the association between benthic macroinvertebrate community structure and the number and location of agricultural BMPs. Macroinvertebrates and water chemistry were sampled in 30 headwater catchments ...


The Effect Of A Small Ruminant Farm Operation And Sustainable Farm Practices: Soil Quality And Run-Off At The University Hickory Hill Farm, Delaware, Gulnihal Ozbay Dr., Akida J. Ferguson, Raju Khatiwada, Lathadevi K. Chintapenta 2014 Tuskegee University

The Effect Of A Small Ruminant Farm Operation And Sustainable Farm Practices: Soil Quality And Run-Off At The University Hickory Hill Farm, Delaware, Gulnihal Ozbay Dr., Akida J. Ferguson, Raju Khatiwada, Lathadevi K. Chintapenta

Professional Agricultural Workers Journal

This project was designed to evaluate the effect of ruminant grazing practices at Hickory Hill Farm on the surrounding environment by measuring soil nutrients and runoff chemistry. Three pastures on the farm (Goat, Cattle and Control) were selected for soil sampling and nutrient analyses were recorded. Physical water quality parameters were conducted on the runoff collected from the farm after Hurricane Sandy. The sites with animal activity had higher levels of sulfate, phosphate, nitrate, Mehlich 3 phosphorus and conductivity when compared to control site. However, the control site had slightly higher pH and chloride levels. Nitrogen and phosphorous levels were ...


Digital Commons powered by bepress