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2006

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Articles 721 - 750 of 5872

Full-Text Articles in Physical Sciences and Mathematics

Bass Management Symposia: Managing Ponds And Lakes For Better Fishing, Billy Higginbotham, Michael Masser, Peter Wood Oct 2006

Bass Management Symposia: Managing Ponds And Lakes For Better Fishing, Billy Higginbotham, Michael Masser, Peter Wood

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Texas contains more than one million privately owned ponds and reservoirs comprising some one-half million surface acres. Interest in managing these ponds for recreational fishing, especially for largemouth bass is high. In order to respond to this educational need, a series of symposia designed to provide information on intensive largemouth bass management was conducted. Symposia were conducted in Athens (2001), San Marcos (2003), and Conroe (2005). The fee-based programs ($50 pre-registration, $75 at the door) attracted 601 participants from Texas and several other states. Each participant received a copy of the symposia proceedings. Exhibitors providing private water management products and …

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Extension: A New Opportunity For On-Line, Issue-Based Programming, Paul D. Curtis, Robert H. Schmidt, Greg K. Yarrow, Raj Smith, Stephen Vantassel Oct 2006

Extension: A New Opportunity For On-Line, Issue-Based Programming, Paul D. Curtis, Robert H. Schmidt, Greg K. Yarrow, Raj Smith, Stephen Vantassel

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Individuals and groups interested in educating the public about human-wildlife interactions should consider joining one of the various working groups (Communities of Practice) involved with eXtension. eXtension is a national Extension program designed to unify Extension’s presence on the Internet. eXtension provides collaborative tools for the development and management of content that can be published on the world wide web. Experts can participate in several ways, including answering visitor questions, submitting content (including text, images, and video), and reviewing content. Currently, of the 21 identified Communities of Practice, only one, Wildlife Damage Management, is focused on fisheries and wildlife programming.

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Extension Wildlife Programs: Thoughts And Ideas, Jeffrey J. Jackson Oct 2006

Extension Wildlife Programs: Thoughts And Ideas, Jeffrey J. Jackson

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The following commentary is a summary of some personal thoughts, reflections, and opinions on extension wildlife programming based on my experience at the University of Georgia as Extension Wildlife Specialist during the years between 1976 and 2001. I hope it will be of some value to new specialists. Because I was the only Extension Wildlife Specialist, I was in a unique position to develop an overview of the entire wildlife management field. Along the way, I had the opportunity to be full time within Extension, have a split appointment, and be assigned to an academic department.

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With One Stroke Of The Pen: How Can Wildlife Extension Specialists Involve Developers And Policy-Makers In Wildlife Conservation?, Mark Hostetler Oct 2006

With One Stroke Of The Pen: How Can Wildlife Extension Specialists Involve Developers And Policy-Makers In Wildlife Conservation?, Mark Hostetler

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Residential developments have a huge impact on natural resources and wildlife, and sustainable or “green” communities are beginning to be built throughout the United States with goals to conserve wildlife habitat, to create healthy lifestyles, and to promote a sense of community. Buzzwords can be heard in the media and in town meetings: sustainability, smart growth, new urbanism, low impact development, and conservation subdivisions. Ultimately, with one stroke of a pen, developers and policymakers can determine how a community will look and feel for many years to come. Plus, citizens make day-to-day decisions that determine whether a community operates as …

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Protecting And Enhancing River And Stream Continuity, Scott Jackson Oct 2006

Protecting And Enhancing River And Stream Continuity, Scott Jackson

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

As long linear ecosystems, rivers and streams are particularly vulnerable to fragmentation. There is growing concern about the role of road crossings – and especially culverts – in altering habitats and disrupting river and stream continuity. The River and Stream Continuity Project began in the year 2000 with a startup grant from the Massachusetts Watershed Initiative. The University of Massachusetts took the lead in convening a group of people from a variety of agencies and organizations who were concerned about the impact of road-stream crossings on fish and other aquatic organism passage. Since its beginning, the River and Stream Continuity …

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Take Action! The Past, Present, And Future Of Sage-Grouse Conservation In Utah, Sarah G. Lupis, Terry A. Messmer, Todd A. Black, S. Nicole Frey, Dean Mitchell, Joan Degiorgio Oct 2006

Take Action! The Past, Present, And Future Of Sage-Grouse Conservation In Utah, Sarah G. Lupis, Terry A. Messmer, Todd A. Black, S. Nicole Frey, Dean Mitchell, Joan Degiorgio

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Utah has a 10-year history of local conservation planning for sage-grouse populations. The San Juan County Gunnison Sage-Grouse Local Working Group (SWOG) was formed in 1996 and completed a local conservation plan in 2000; the Parker Mountain Adaptive Resource Management Local Working Group (PARM) was established in 1998 and has been a model for sagegrouse conservation planning throughout the state. In July 2006, most of Utah’s 12 adaptive resource management local working groups completed local conservation plans for sage-grouse that address the unique issues affecting their respective areas. Each local working group is made up of diverse stakeholders including landowners, …

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The Florida Master Naturalist Program: Creating, Implementing, And Evaluating A Successful Statewide Conservation Education Program, Martin B. Main Oct 2006

The Florida Master Naturalist Program: Creating, Implementing, And Evaluating A Successful Statewide Conservation Education Program, Martin B. Main

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The Florida Master Naturalist Program is an educational program with a well-developed curriculum that encourages but does not require volunteer service. Its history, development, administration, curriculum, and target audiences are described. It presently consists of three modules: Freshwater Wetlands, Coastal Systems, and Upland Habitats. Considerations regarding program training, how instructors are recruited and selected, and how program impacts are evaluated are summarized.

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A Web-Based Outreach Tool For Aquatic Vegetation Management, Michael P. Masser Oct 2006

A Web-Based Outreach Tool For Aquatic Vegetation Management, Michael P. Masser

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Most private impoundments have multiple uses for either livestock watering, irrigation, aquaculture, and/or recreation. Infestations of aquatic vegetation can have negative impacts on these multiple uses by 1) hindering feeding and harvesting operations, 2) reducing recreational access, 3) clogging irrigation systems, 4) increasing evaporation rates by as much as 30%, 5) increasing eutrophication rates by 2- to 3-fold, 6) negatively impacting water quality for fish and wildlife species, 7) shifting the balance of the fish population (e.g., stunting), and 8) increasing breeding areas for mosquitoes and other insect pests. Many of the most noxious aquatic plants are non-indigenous invasives. Aquatic …

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An Internet Survey Of Private Pond Owners And Managers In Texas, Michael P. Masser, April E. Schonrock Oct 2006

An Internet Survey Of Private Pond Owners And Managers In Texas, Michael P. Masser, April E. Schonrock

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The primary emphasis of this survey was to determine what specific problems Texas private impoundment owners/managers confront, how widely these problems occur, and where owners/managers get their information on pond management. A secondary emphasis was to examine the potential utilization of the Internet to gather information and distributed outreach materials. A random sample of 2,999 private impoundment (i.e., no public waters) applicants for Triploid Grass Carp Permits from Texas Parks and Wildlife was utilized as the survey mailing list. A 49-question survey was developed and placed on a secure web site. Each questionnaire contained five sections: general pond characteristics, physical …

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Sage-Grouse Restoration Project: Evaluating The Effects Of The Farm Bill Conservation Practices On Sage-Grouse, Terry A. Messmer Oct 2006

Sage-Grouse Restoration Project: Evaluating The Effects Of The Farm Bill Conservation Practices On Sage-Grouse, Terry A. Messmer

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The Office of Management and Budget is demanding increased accountability of funds used to implement conservation practices and strategies. Although current Farm Bill policy provides priority funding for projects that are designed to enhance species conservation, it does not allocate funds to conduct the evaluations needed to document the effect of conservation practices on wildlife. The Sage-Grouse Restoration Project (SGRP) is a cooperative agreement with the Natural Resource Conservation Service (NRCS), designed specifically to facilitate evaluations to determine the effect of conservation practices and technologies implemented under the 2002 Farm Bill on restoring or enhancing sage-grouse habitat on private lands. …

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The “We Know, We Believe, And We Feel” Approach To Implementing Projects Under The Farm Bill To Benefit Sage-Grouse, Terry A. Messmer Oct 2006

The “We Know, We Believe, And We Feel” Approach To Implementing Projects Under The Farm Bill To Benefit Sage-Grouse, Terry A. Messmer

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Sage-grouse occupy less than 8% of their historic range. To address these declines, the western states and provinces have implemented sage-grouse management plans. These plans identified the need for local working groups (LWGs) to develop and implement conservation plans to address high priority issues. To facilitate LWGs in Utah, the Division of Wildlife Resources entered into a cooperative agreement with Utah State University Extension in 2001 to develop a Utah Community-Based Conservation (CBCP) program. Because sage-grouse occupy diverse landscapes each exhibiting different land ownership patterns, each of the sage-grouse management areas are somewhat unique. Thus, we believe the success of …

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Panel Discussion: The Future Of Natural Resources Extension, Gary San Julian Moderator Oct 2006

Panel Discussion: The Future Of Natural Resources Extension, Gary San Julian Moderator

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Today we want to talk about the future of Extension. At the committee meeting, we talked about what the important things were, and a high priority that everyone is concerned about is going to happen in 2020: Where is Extension going to be, where is the fisheries and wildlife program going to be, where are we in the states going to be, and what kind of support are we going to get?

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Saving The World One Native Plant At A Time, Christopher E. Moorman, Christopher S. Deperno Oct 2006

Saving The World One Native Plant At A Time, Christopher E. Moorman, Christopher S. Deperno

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Wildlife habitat is lost as the human population and land clearing for development increase in the South. Remaining habitats are fragmented and contain high numbers of invasive, exotic plants. Suburban, manicured landscapes often lack the plant diversity and complex vegetation structure important to wildlife. Generally, developers and homeowners replant cleared grounds with exotic plants that don’t provide quality wildlife habitat. Instead, individual home or property owners can mitigate wildlife habitat loss in urban areas by landscaping with native plants following proper design principles. Furthermore, many people taking action over a large area (e.g., across a neighborhood) will help connect small …

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Breaking Through The Food Plot Mentality, Christopher E. Moorman, Craig A. Harper, Christopher Deperno Oct 2006

Breaking Through The Food Plot Mentality, Christopher E. Moorman, Craig A. Harper, Christopher Deperno

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Landowners and other wildlife enthusiasts often desire instant gratification when attempting to attract wildlife to their properties. Advertisements distributed by television programs, outdoor publications, and conservation organizations have played a large part in creating the desire for a quick and easy fix. Landowners are erroneously led to believe food plots or plantings of nonnative shrubs and trees will raise the carrying capacity for target wildlife species, even though the typical privately-held property contains overstocked, high-graded timber, intensively maintained croplands, mowed roadsides and drainage ditches, fire-suppressed woodlands, and pastures vegetated with non-native grasses that provide no cover and poor-quality forage. In …

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Integrating Northern Bobwhite And Grassland Bird Habitat Enhancement Practices On University Of Missouri Agriculture Experiment Stations: An Educational Model That Puts Knowledge Into Action Through Use Of Demonstrations, Tim Reinbott, Robert A. Pierce Ii, Bill White, Brad Jacobs, Nadia Navarrete-Tindall Oct 2006

Integrating Northern Bobwhite And Grassland Bird Habitat Enhancement Practices On University Of Missouri Agriculture Experiment Stations: An Educational Model That Puts Knowledge Into Action Through Use Of Demonstrations, Tim Reinbott, Robert A. Pierce Ii, Bill White, Brad Jacobs, Nadia Navarrete-Tindall

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Over the past 50 years, advances in agricultural production negatively influenced habitats for bobwhite quail (Colinus virginianus) and grassland bird species. Farming systems, once beneficial for bobwhite, greater prairie chicken (Tympanuchus cupido), Henslow’s sparrow (Ammodramus henslowii), eastern meadowlark (Sturnella magna), and many other wildlife species, provided a diversity of early successional habitats. With increases in farm size, intensive cultivation, chemical weed and insect pest control and more efficient harvest practices, many producers have been able to stay in business, but quality habitats for many species have been reduced.

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Best Management Practices For Aquatic Vegetation Management In Lakes, Joseph E. Morris, Richard D. Clayton Oct 2006

Best Management Practices For Aquatic Vegetation Management In Lakes, Joseph E. Morris, Richard D. Clayton

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Aquatic plants are an important component of well functioning lake ecosystems. Plant abundance is influenced by sediments, nutrients and water clarity. Given the dominance of agriculture in Iowa, nutrients and soil lost from “leaky” watersheds combine to create ideal habitat for growth of aquatic plants in lakes and ponds and hasten eutrophication. Under these conditions, plant growth can become a nuisance and reduce recreation, especially shoreline angling and boating. These nuisance growths present special problems to lake managers and those interested in lake-based recreation. Given the complexity of the aquatic vegetation often found in lakes, there is no one long-term …

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An Extension Program Helping Private Landowners Develop Natural Resource Enterprises In Mississippi, A. T. Rohnke, W. D. Jones, K. M. Jacobs, T. A. Tullos Oct 2006

An Extension Program Helping Private Landowners Develop Natural Resource Enterprises In Mississippi, A. T. Rohnke, W. D. Jones, K. M. Jacobs, T. A. Tullos

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The Natural Resources Enterprise (NRE) Program at Mississippi State University has developed a comprehensive statewide extension effort to assist landowners in developing and managing outdoor recreational businesses using sound business and habitat management strategies. According to recent research, fee access wildlife and fisheries recreational enterprises on private lands diversify landowner income, enhance participation in USDA cost-share programs that increase wildlife habitats on marginal agricultural lands, and promote land stewardship and ownership retention. With this program, information pertinent to the development and management of natural resource enterprises is disseminated through a combination of landowner workshops, websites, extension publications, manuals, DVD tutorials, …

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The Above-Ground Movement And Dispersal Of The Plains Pocket Gopher (Geomys Bursarius), Craig Panich Oct 2006

The Above-Ground Movement And Dispersal Of The Plains Pocket Gopher (Geomys Bursarius), Craig Panich

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The Plains pocket gopher has the largest range of its genus, and it is the gopher that inhabits much of Wisconsin. Gophers are fossorial herbivores that have a dramatic impact on natural and agricultural ecosystems. Throughout the summer of 2005, I completed a population analysis of the plains pocket gopher in a variety of habitats in Buffalo and Trempealeau Counties, Wisconsin, that provided valuable insight into the complex population dynamics of the gopher and served as a foundation to this project. Pocket gophers are known to be strictly subterranean; however, it is not uncommon to find their remains inside the …

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The Center For Human-Wildlife Conflict Resolution At Virginia Tech: A Model Of Future Use, James A. Parkhurst Oct 2006

The Center For Human-Wildlife Conflict Resolution At Virginia Tech: A Model Of Future Use, James A. Parkhurst

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

The Center for Human-Wildlife Conflict Resolution, located at Virginia Tech, was created in mid-2004 to bring together representatives of state and federal agencies, private sector practitioners, non-governmental organizations, researchers, educators, and other stakeholders common to most human-wildlife conflicts as a means to facilitate and expedite the process of attaining realistic and publicly acceptable solutions to human-wildlife conflicts. The Center has four critical missions: coordination, information transfer, research, and training. Participating partners (i.e., members) in the Center adopted upon an Advisory Board organizational model and operate under a “majority rule” protocol. Increased awareness and understanding of the missions, regulatory mandates, and …

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Approaches For Delivering Integrated Forestry And Wildlife Extension Programs: The Missouri Woodland Steward Short Course And Missouri Master Wildlifer Program, Robert A. Pierce Ii, H. E. Stelzer Oct 2006

Approaches For Delivering Integrated Forestry And Wildlife Extension Programs: The Missouri Woodland Steward Short Course And Missouri Master Wildlifer Program, Robert A. Pierce Ii, H. E. Stelzer

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Extension educational programs related to the stewardship of Missouri’s natural resources have been identified as a priority in the MU College of Agriculture Food and Natural Resource’s “Extension Base Program” (MU CAFNR 2001). Citizens own approximately 94% of the land in the state and therefore manage most of the natural resource base, including forests, agricultural lands, prairies and grasslands, wetlands, streams, and other natural habitats. Abundant natural resources, renewable and nonrenewable alike, provide for agriculture and timber production as well as recreational opportunities, each of which are directly or indirectly responsible for a majority of the economic activity within Missouri. …

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Extension Wildlife And Fisheries Take-A-Ways, Ross "Skip" Shelton Oct 2006

Extension Wildlife And Fisheries Take-A-Ways, Ross "Skip" Shelton

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Never underestimate the power of policy, whether it be –
• Wildlife
• Fisheries
• Tax

• Land
Joint venturing doesn’t have to be costly in time or money.

Backyards are becoming more plentiful than back fortys – think urban wildlife.

Appeal to multiple values when selling wildlife and fisheries conservation (father, son, mother, daughter).

The extension demonstration method is still a very effective communication technique.

Third party testimony is more effective than personal advocacy.

Build consensus: all of us are smarter than any of us.

Enjoy your extension career. It is one of the very best in the natural …

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An Introduction To The Revised Southern Region 4-H Wildlife Projects, Renee Strnad, Chris Moorman Oct 2006

An Introduction To The Revised Southern Region 4-H Wildlife Projects, Renee Strnad, Chris Moorman

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

During the 1970s, a partnership between the United States Department of Agriculture and the National 4-H Council led to the creation of the Southern Region Wildlife Project materials. Fifty-one publications, based on a variety of fish and wildlife-related subject matter, were created. In 1999, the North Carolina Department of 4-H and Youth Development received a grant from the United States Fish and Wildlife Service to revise the publications. Twenty-four of the original 51 publications were selected for revision by Extension Specialists and other wildlife biologists in several southern states. Content and format for the projects were updated in the revised …

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Coyotes Nipping At Our Heels: A New Suburban Dilemma, Robert M. Timm Oct 2006

Coyotes Nipping At Our Heels: A New Suburban Dilemma, Robert M. Timm

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

In the 1970s, coyote attacks on humans in urban and suburban environments began to occur, primarily in Southern California. Such attacks have increased in number, and since the late 1980s coyote attacks on people have been reported from at least 16 additional states and 4 Canadian provinces. Attack incidents are typically preceded by a sequence of increasingly bold coyote behaviors, including attacks on pets during daylight hours. In suburban areas, coyotes can habituate to humans as a result of plentiful food resources, including increased numbers of rabbits and rodents, household refuse, pet food, water from ponds and landscape irrigation run-off, …

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Cooperative Is The Cornerstone Of Extension Education, Don Steinbach Oct 2006

Cooperative Is The Cornerstone Of Extension Education, Don Steinbach

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Cooperation is the key to making Extension education work, both from an implementation and funding perspective. We can all cite many examples of this in our many programs, and thus the name of many of state Extension agencies. This example is one of cooperative funding with the Texas Parks and Wildlife Department to implement a joint Conservation Education Program.

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Managing Kentucky Fee Fishing Operations, Forrest Wynne Oct 2006

Managing Kentucky Fee Fishing Operations, Forrest Wynne

Triennial National Wildlife and Fisheries Extension Specialists Conference: 11th (2006)

Management strategies for operating fee fishing operations in Kentucky are described. Recommendations are given for stocking rates of catfish, hybrid bream, and trout; aeration, pond depth and shape, supplemental feeding, and other management considerations. Marketing considerations discussed include pricing, and amenities such as restrooms, fish-cleaning services, and concessions including rental or sale of tackle and supplies.

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Real-Time Divisible Load Scheduling For Cluster Computing, Xuan Lin, Ying Lu, Jitender S. Deogun, Steve Goddard Oct 2006

Real-Time Divisible Load Scheduling For Cluster Computing, Xuan Lin, Ying Lu, Jitender S. Deogun, Steve Goddard

CSE Technical Reports

Cluster computing has emerged as a new paradigm for solving large-scale problems. To enhance QoS and provide performance guarantees in cluster computing environments, various real-time scheduling algorithms and workload models have been investigated. Computational loads that can be arbitrarily divided into independent pieces represent many real-world applications. Divisible load theory (DLT) provides insight into distribution strategies for such computations. However, the problem of providing performance guarantees to divisible load applications has not yet been systematically studied. This paper investigates such algorithms for a cluster environment. Design parameters that affect the performance of these algorithms and scenarios when the choice of …

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Bayesian Hidden Markov Modeling Of Array Cgh Data, Subharup Guha, Yi Li, Donna Neuberg Oct 2006

Bayesian Hidden Markov Modeling Of Array Cgh Data, Subharup Guha, Yi Li, Donna Neuberg

Harvard University Biostatistics Working Paper Series

Genomic alterations have been linked to the development and progression of cancer. The technique of Comparative Genomic Hybridization (CGH) yields data consisting of fluorescence intensity ratios of test and reference DNA samples. The intensity ratios provide information about the number of copies in DNA. Practical issues such as the contamination of tumor cells in tissue specimens and normalization errors necessitate the use of statistics for learning about the genomic alterations from array-CGH data. As increasing amounts of array CGH data become available, there is a growing need for automated algorithms for characterizing genomic profiles. Specifically, there is a need for …

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Search For Associated Higgs Boson Production Wh → Www*→ L±ΝL′±Ν′ +X In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory R. Snow, D0 Collaboration Oct 2006

Search For Associated Higgs Boson Production Wh → Www*→ L±ΝL′±Ν′ +X In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory R. Snow, D0 Collaboration

Kenneth Bloom Publications

We present a search for associated Higgs boson production in the process pp̅ → WH → WWW*→ l±νl′±ν′ +X in final states containing two like-sign isolated electrons or muons (ℯ±ℯ±, ℯ±μ±, or μ±μ±). The search is based on D0 run II data samples corresponding to integrated luminosities of 360–380 pb-1. No excess is observed over the predicted standard model background. We set 95% C.L. upper limits on σ(pp̅→WH) × (Br(H→ WW …

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Dynamic Characterization Of Web Application Interfaces, Marc Randall Fisher Ii, Sebastian Elbaum, Gregg Rothermel Oct 2006

Dynamic Characterization Of Web Application Interfaces, Marc Randall Fisher Ii, Sebastian Elbaum, Gregg Rothermel

CSE Technical Reports

Web applications are increasingly prominent in society, serving a wide variety of user needs. Engineers seeking to enhance, test, and maintain these applications and third-party programmers wishing to utilize these applications need to understand their interfaces. In this paper, therefore, we present methodologies for characterizing the interfaces of web applications through a form of dynamic analysis, in which directed requests are sent to the application, and responses are analyzed to draw inferences about its interface. We also provide mechanisms to increase the scalability of the approach. Finally, we evaluate the approach’s performance on six non-trivial web applications.

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Halogen Emissions From A Small Volcanic Eruption: Modeling The Peak Concentrations, Dispersion, And Volcanically Induced Ozone Loss In The Stratosphere, G. A. Millard, T. A. Mather, D. M. Pyle, William I. Rose, B. Thornton Oct 2006

Halogen Emissions From A Small Volcanic Eruption: Modeling The Peak Concentrations, Dispersion, And Volcanically Induced Ozone Loss In The Stratosphere, G. A. Millard, T. A. Mather, D. M. Pyle, William I. Rose, B. Thornton

Department of Geological and Mining Engineering and Sciences Publications

Aircraft measurements in the Hekla, Iceland volcanic plume in February 2000 revealed large quantities of hydrogen halides within the stratosphere correlated to volcanic SO2. Investigation of the longer-term stratospheric impact of these emissions, using the 3D chemical transport model, SLIMCAT suggests that volcanic enhancements of H2O and HNO3 increased HNO3·3H2O particle availability within the plume. These particles activated volcanic HCl and HBr, enhancing model plume concentrations of ClOx (20 ppb) and BrOx (50 ppt). Model O3 concentrations decreased to near-zero in places, and plume average O3 remained 30% lower after two weeks. Reductions in the model O3column reduced UV shielding …

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