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Articles 6661 - 6690 of 10877
Full-Text Articles in Entire DC Network
Predisposing Factors With Complementary Feeding Practices Among 9-11 Month-Old Infants In Jakarta Urban Slum Area, Septriana Septriana, Gita Ardelia Suhartono
Predisposing Factors With Complementary Feeding Practices Among 9-11 Month-Old Infants In Jakarta Urban Slum Area, Septriana Septriana, Gita Ardelia Suhartono
Kesmas
Penyebab utama kekurangan gizi selain dari penyakit infeksi adalah pola asuh yang tidak sesuai dan pemberian makan yang optimal menjadi salah satu cara untuk mengatasi konsekuensi jangka panjang dari kekurangan zat gizi. Penelitian ini bertujuan untuk mengetahui hubungan antara faktor pendukung praktik pemberian makanan pendamping air susu ibu (MPASI) pada bayi usia 9 - 11 bulan di daerah kumuh perkotaan Jakarta. Penelitian potong lintang ini melibatkan 50 orang pengasuh bayi usia 9 – 11 bulan. Data dikumpulkan melalui wawancara menggunakan kuesioner. Tidak terdapat hubungan yang bermakna antara usia pengasuh dengan praktik pemberian makan (nilai p = 0,645). Demikian juga dengan …
Effects Of Mothers’ Attitude As Breeders And Distance Of Stockyard Toward Diarrhea Incidence Among Toddlers, Yarmaliza Yarmaliza, Sugito Sugito, Teuku Reza Ferasyi, Nurliana Nurliana, Razali Razali
Effects Of Mothers’ Attitude As Breeders And Distance Of Stockyard Toward Diarrhea Incidence Among Toddlers, Yarmaliza Yarmaliza, Sugito Sugito, Teuku Reza Ferasyi, Nurliana Nurliana, Razali Razali
Kesmas
Diare merupakan penyakit dengan perubahan bentuk dan konsentrasi tinja yang melembek sampai mencair, dan bertambahnya frekuensi buang air besar lebih dari biasanya (tiga kali atau lebih dalam sehari). Di Provinsi Aceh, terdapat kasus diare sebanyak 48/1.000 kelahiran hidup pada 2013. Di Kabupaten Aceh Barat, pada tahun 2014 terdapat 1.071 kasus, sedangkan di Kecamatan Meureubo terdapat sebanyak 70 kasus pada anak bawah lima tahun (balita). Penelitian ini bertujuan untuk mengetahui hubungan sikap ibu sebagai peternak dan jarak kandang ternak terhadap kejadian diare pada balita di wilayah kerja Puskesmas Kecamatan Meureubo. Penelitian ini dilakukan secara potong lintang pada bulan Juli – September …
Communication Of Parents, Sexual Content Intake And Teenage Sexual Behavior At Senior High School In Banjarmasin City, Rusmilawaty Rusmilawaty, Yuniarti Yuniarti, Tri Tunggal
Communication Of Parents, Sexual Content Intake And Teenage Sexual Behavior At Senior High School In Banjarmasin City, Rusmilawaty Rusmilawaty, Yuniarti Yuniarti, Tri Tunggal
Kesmas
Perilaku seks bebas di kalangan remaja Kota Banjarmasin belakangan ini semakin mengkhawatirkan para orangtua. Kurangnya pendidikan seksologi berdampak para remaja cenderung melakukan hubungan seksual pranikah yang akan berakibat pada kehamilan yang tidak diinginkan dan pernikahan dini. Komunikasi orangtua-anak dan paparan media baik media cetak maupun elektronik merupakan cara untuk mengurangi perilaku seksual berisiko. Tujuan penelitian ini untuk mengetahui hubungan komunikasi orangtua dan asupan muatan seksual dengan perilaku seksual remaja sekolah menengah atas (SMA) di Kota Banjarmasin. Untuk mencapai tujuan tersebut, penelitian survei analitik dengan pendekatan potong lintang dilakukan pada bulan Juli – Oktober 2015 di dua sekolah negeri dan satu …
The New Blue Economy: The Future Of Sustainability, Mark J. Spalding
The New Blue Economy: The Future Of Sustainability, Mark J. Spalding
Journal of Ocean and Coastal Economics
The world’s ocean is the world’s life support. Many human activities have defined a negative relationship with the ocean. Simply put: we dump too much bad stuff in, and we take too much good stuff out. The traditional ocean economy—those ocean-based and ocean-related activities from which humans derive economic benefit— did not acknowledge or honor the ocean’s natural services, nor its finite capacity to take human abuse without undermining those services on which we depend. The “new blue economy” is the term of art for identifying those activities that improve the human relationship with the ocean and for aligning our …
Essays In Dynamic Macroeconomics And Fiscal Policy., Pawan Gopalakrishnan Dr.
Essays In Dynamic Macroeconomics And Fiscal Policy., Pawan Gopalakrishnan Dr.
Doctoral Theses
In the last two decades, several events in the global economy, like the recession in Japan (1990-2010), the dot com crisis in the US, and the recent global economic and Önancial crisis (which started in 2007-08), to name a few, have brought issues related to Öscal policy back into the limelight. If we look back into the history of policy making, Öscal policy was Örst brought onto the centre-stage in the US during the Great Depression years of the 1930s (see Kopcke et al. (2005) and Feldstein (2009)). It was believed that expansionary Öscal policy would serve as an automatic …
Ua12/2/1 Dining Guide, Wku Student Affairs
Ua12/2/1 Dining Guide, Wku Student Affairs
WKU Administration Documents
Special dining guide edition of the College Heights Herald.
- Moore, Elisabeth. Students Share Opinions on New Restaurants – Topper Grill & Pub, Chili’s
- Henderson, Andrew. Brunch: The Second Official Meal of the Day
- Pettway, Shantel. 6 Restaurants in Bowling Green You Don’t Want to Miss
- Turner, Justin. Tomatoes for Toppers – Sustainability, Agriculture
- Moore, Mollie. Con Con’s: The Best Diner in Kentucky
- Reecer, John. A Day in the Life of a Sports-minded Diet
- Carter, Brandon & Katherine Sproles. Top Worst Places to Take Your Date to Dinner
- Gilliland, Justin. Downing Student Union Food Court Options
Soil Functional Zone Management: A Vehicle For Enhancing Production And Soil Ecosystem Services In Row-Crop Agroecosystems, Alwyn Williams, Daniel A. Kane, Patrick M. Ewing, Lesley W. Atwood, Andrea Jilling, Meng Li, Yi Lou, Adam S. Davis, A. Stuart Grandy, Sheri C. Huerd, Mitchell C. Hunter, Roger T. Koide, David A. Mortensen, Richard G. Smith, Sieglinde S. Snapp, Kurt A. Spokas, Anthony C. Yannarell, Nicholas R. Jordan
Soil Functional Zone Management: A Vehicle For Enhancing Production And Soil Ecosystem Services In Row-Crop Agroecosystems, Alwyn Williams, Daniel A. Kane, Patrick M. Ewing, Lesley W. Atwood, Andrea Jilling, Meng Li, Yi Lou, Adam S. Davis, A. Stuart Grandy, Sheri C. Huerd, Mitchell C. Hunter, Roger T. Koide, David A. Mortensen, Richard G. Smith, Sieglinde S. Snapp, Kurt A. Spokas, Anthony C. Yannarell, Nicholas R. Jordan
Faculty Publications
There is increasing global demand for food, bioenergy feedstocks and a wide variety of bio-based products. In response, agriculture has advanced production, but is increasingly depleting soil regulating and supporting ecosystem services. New production systems have emerged, such as no-tillage, that can enhance soil services but may limit yields. Moving forward, agricultural systems must reduce trade-offs between production and soil services. Soil functional zone management (SFZM) is a novel strategy for developing sustainable production systems that attempts to integrate the benefits of conventional, intensive agriculture, and no-tillage. SFZM creates distinct functional zones within crop row and inter-row spaces. By incorporating …
Using Cosmic-Ray Neutron Probes To Monitor Landscape Scale Soil Water Content In Mixed Land Use Agricultural Systems, Trenton E. Franz, Ammar Wahbi, Mariette Vreugdenhil, Georg Weltin, Lee Hang, Markus Oismueller, Peter Strauss, Gerd Dercon, Darin Desilets
Using Cosmic-Ray Neutron Probes To Monitor Landscape Scale Soil Water Content In Mixed Land Use Agricultural Systems, Trenton E. Franz, Ammar Wahbi, Mariette Vreugdenhil, Georg Weltin, Lee Hang, Markus Oismueller, Peter Strauss, Gerd Dercon, Darin Desilets
School of Natural Resources: Faculty Publications
With an ever-increasing demand for natural resources and the societal need to understand and predict natural disasters, soil water content (SWC) observations remain a critical variable to monitor in order to optimally allocate resources, establish early warning systems, and improve weather forecasts.However, routine agricultural production practices of soil cultivation, planting, and harvest make the operation andmaintenance of direct contact point sensors for long-termmonitoring challenging. In this work, we explore the use of the newly established Cosmic-Ray Neutron Probe (CRNP) and method to monitor landscape average SWC in a mixed agricultural land use systemin northeastAustria.Thecalibrated CRNP landscape SWC values compare well …
Structural Dependence Of The In Vitro Cytotoxicity, Oxidative Stress And Uptake Mechanisms Of Poly(Propylene Imine) Dendritic Nanoparticles, Humza Khalid, Sourav Prasanna Mukherjee, Luke O'Neill, Hugh Byrne
Structural Dependence Of The In Vitro Cytotoxicity, Oxidative Stress And Uptake Mechanisms Of Poly(Propylene Imine) Dendritic Nanoparticles, Humza Khalid, Sourav Prasanna Mukherjee, Luke O'Neill, Hugh Byrne
Articles
The in vitro cytotoxic and intracellular oxidative stress responses to exposure to poly (propylene imine) (PPI) dendritic nanoparticles of increasing generation (number of repeated branching cycles) (G0-G4) were assessed in an immortal non-cancerous human keratinocyte cell-line (HaCaT). Confocal fluorescence microscopy with organelle staining was used to explore the uptake and intracellular trafficking mechanisms. A generation and dose dependent cytotoxic response was observed, increasing according to generation and therefore number of surface amino groups. A comparison of the cytotoxic response of G4 PPI and the related G4 Poly (amido amine) dendrimer indicates that the PPI with the same number of surface …
Drought Risk Management For Beef Cattle Farms, Stephen F. Higgins, Lee Moser, Kylie Schmidt
Drought Risk Management For Beef Cattle Farms, Stephen F. Higgins, Lee Moser, Kylie Schmidt
Agriculture and Natural Resources Publications
One of the most challenging aspects of owning and operating any farming operation is dealing with uncertainty. Uncertainty on the farm comes in many forms; livestock health, feed prices, fuel prices, market prices, and weather to name a few. Over the past decade, the prevalence and impact of drought on agriculture has dramatically increased, thus adding further uncertainty to farmers’ decision-making processes. Drought and the associated loss of productivity is a real risk scenario that all farmers must face. With this inherent risk, one must protect their farm and the environment it impacts through a sound decision-making process that factors …
Brief 12: Energy Transitions To Modern Renewables: Context, Barriers, And Promises, Stanislav Vavilov
Brief 12: Energy Transitions To Modern Renewables: Context, Barriers, And Promises, Stanislav Vavilov
Governance and Sustainability Issue Brief Series
The world is not running out of fossil fuels, as is often claimed. With technological progress and favorable economic conditions, a process of resource-base expansion occurs through the production of resources that were previously considered economically unviable. Resource-base expansion requires increasing capital investments per unit of energy extracted and an accompanying rise in production costs per unit. The world is running out of cheap fossil fuels, and in the long term, dependence on fossil fuels leads to energy services that are much more expensive and inaccessible. Given other important incentives for transitioning from fossil fuels, such as the need to …
Effect Of Grazing Prairie Dog—Colonized Rangeland On Cattle Nutrition And Performance: A Progress Report, Kenneth C. Olson, Christopher Schauer, Chanda Engel, Janna J. Kincheloe, Jameson R. Brennan, Ben L. Hauptman
Effect Of Grazing Prairie Dog—Colonized Rangeland On Cattle Nutrition And Performance: A Progress Report, Kenneth C. Olson, Christopher Schauer, Chanda Engel, Janna J. Kincheloe, Jameson R. Brennan, Ben L. Hauptman
Natural Resource Management Faculty Publications
On the Ground
- One objective of the ongoing Renewal on Standing Rock Reservation project is to evaluate the response of grazing steers to the level of prairie dog colonization on Northern Mixed Grass Prairie.
- We fenced four pastures to create an increasing gradient of a proportion of the pasture area colonized by prairie dogs. Pastures are stocked with yearling steers during each growing season.
- Comparing steer performance, Global Positioning System (GPS) locations of grazing, diet samples, and ingestive behavior at each proportion of the prairie dog colony per pasture allows prediction of the optimal proportion of colonization, which enables selection …
Review Of Land Capability Assessment For The Swan Valley, Peter Tille, Angela Stuart-Street
Review Of Land Capability Assessment For The Swan Valley, Peter Tille, Angela Stuart-Street
Resource management technical reports
Land capability review for the Swan Valley.
The land capability review of the Swan Valley examined and updated previous soil and capability studies done in the area, which are still considered highly relevant for the planning requirements of the Swan Valley. As a result we have updated information on the potential for irrigated agriculture in the Swan Valley which will guide decision-making in the future.
This review uses a modified version of a new approach to presenting information for land use planning, developed by DAFWA in the Mid West region.
The main findings of the review include:
- The alluvial terraces …
Approximating Optimal Release In A Deterministic Model For The Sterile Insect Technique, Sergio Ramirez, Luis F. Gordillo
Approximating Optimal Release In A Deterministic Model For The Sterile Insect Technique, Sergio Ramirez, Luis F. Gordillo
Mathematics and Statistics Faculty Publications
Cost/benefit analyses are essential to support management planning and decisions before launching any pest control program. In particular, applications of the sterile insect technique (SIT) are often prevented by the projected economic burden associated with rearing processes. This has had a deep impact on the technique development and its use on insects with long larval periods, as often seen in beetles. Under the assumptions of long adult timespan and multiple mating, we show how to find approximate optimal sterile release policies that minimize costs. The theoretical framework proposed considers the release of insects by pulses and finds approximate optimal release …
Depression In Mexican Americans With Diagnosed And Undiagnosed Diabetes, Rene L. Olvera, Susan P. Fisher-Hoch, Douglas E. Williamson, Kristina Vatcheva, Joseph B. Mccormick
Depression In Mexican Americans With Diagnosed And Undiagnosed Diabetes, Rene L. Olvera, Susan P. Fisher-Hoch, Douglas E. Williamson, Kristina Vatcheva, Joseph B. Mccormick
School of Mathematical & Statistical Sciences Faculty Publications
Background: Depression and diabetes commonly co-occur; however, the strength of the physiological effects of diabetes as mediating factors towards depression is uncertain.
Method: We analyzed extensive clinical, epidemiological and laboratory data from n = 2081 Mexican Americans aged 35-64 years, recruited from the community as part of the Cameron County Hispanic Cohort (CCHC) divided into three groups: Diagnosed (self-reported) diabetes (DD, n = 335), Undiagnosed diabetes (UD, n = 227) and No diabetes (ND, n = 1519). UD participants denied being diagnosed with diabetes, but on testing met the 2010 American Diabetes Association and World Health Organization definitions of diabetes. …
Metabolic Disorders, Drug Development, Drug Design And Biomarkers, Gjumrakch Aliev, Ramon Cacabelos, V. Prakash Reddy
Metabolic Disorders, Drug Development, Drug Design And Biomarkers, Gjumrakch Aliev, Ramon Cacabelos, V. Prakash Reddy
Chemistry Faculty Research & Creative Works
No abstract provided.
How Diversity Extends The Grazing Season At Dogwood Farm, Debby Dulworth
How Diversity Extends The Grazing Season At Dogwood Farm, Debby Dulworth
Kentucky Grazing Conference
This article was previously published in Cow Country News.
Cattle are a valuable resource these days, in ways that most people, consumers and producers alike, haven’t yet realized. Putting some other resources into making the change for a better grazing system makes sense, especially here in Kentucky, where grass has, in the past, been the basis of a healthy and expansive economy. Grass can once again be the basis for a healthy economy, if enough people with the vision to see its possibilities get involved and make it happen. A truly healthy economy begins with good human health and …
Soy Hulls: More Than Just A Feed Supplement, Glen E. Aiken, Michael Flythe
Soy Hulls: More Than Just A Feed Supplement, Glen E. Aiken, Michael Flythe
Kentucky Grazing Conference
There is approximately 35 million acres of tall fescue in the USA, with most of this acreage being utilized in hay meadows and grazed pastures in a region between the temperate northeast and subtropical southeast and commonly referred to as the Fescue Belt. Popularity of the grass is due to its productivity, persistence, and low cost of management. Unfortunately, a fungal endophyte that infects most plants of tall fescue produces ergot alkaloid toxins that cause a toxicosis in cattle and other grazing livestock. Fescue toxicosis may reduce reproductive performance of cow herds and weaning weights, and reduce post-weaning weight gain …
Stock Market Reactions To The Iarc Announcement Linking Red Meat And Processed Meat To Cancer, Scott B. Lehman
Stock Market Reactions To The Iarc Announcement Linking Red Meat And Processed Meat To Cancer, Scott B. Lehman
Journal of Environmental and Resource Economics at Colby
This study investigates how food companies were affected by the International Agency for Research on Cancer’s report that linked processed meat and red meat consumption to increased risk of cancer. The results indicate that neither fast food companies nor meat producers were greatly affected by the announcement in the days immediately following the release.
Physical Fitness Of Police Cadets: Baseline Characteristics And Changes During A 16-Week Academy, Amy Crawley, Ross Sherman, William Crawley, Ludmila M. Cosio-Lima
Physical Fitness Of Police Cadets: Baseline Characteristics And Changes During A 16-Week Academy, Amy Crawley, Ross Sherman, William Crawley, Ludmila M. Cosio-Lima
Open Access Publishing Support Funded Articles
Police academies traditionally emphasize the importance of being physically fit. The purpose of this research was to determine cadet baseline physical fitness characteristics and assess effectiveness of a 16-week training program. Sixty-eight cadets (61 men, 7 women) volunteered to have baseline physical fitness characteristics assessed, and 55 cadets (49 men, 6 women) completed further testing at weeks 8 and 16. The testing comprised hand grip (strength), arm crank (upper-body power), 30 seconds Wingate (lower body power), sum of skinfolds and percentage body fat (body composition), 40-yard dash (sprint speed), 1 repetition maximum bench press (strength), T-test (agility), and sit-and-reach (flexibility). …
Creating A Better World With Information And Communication Technologies: Health Equity, Sajda Qureshi
Creating A Better World With Information And Communication Technologies: Health Equity, Sajda Qureshi
Information Systems and Quantitative Analysis Faculty Publications
When news broke on 23rd July 2014, that a case of the deadly virus Ebola had been confirmed in Lagos, home to about 21 million people and a major transportation hub, the World held its breath. If not contained, this virus could spread quickly killing a multitude of people around the World. By 15th October, cases of Ebola had been recorded around the World: Liberia reported 4249 cases with 2458 deaths, Sierra Leone reported 3252 cases with 1183 deaths, Guinea 1472 cases with 843 deaths, Nigeria reported 20 cases with 8 deaths, the USA reported 3 cases and 1 death, …
Comparison Of Terrain Indices And Landform Classification Procedures In Low-Relief Agricultural Fields, Derek A. Evans, Karl W. J. Williard, Jon E. Schoonover
Comparison Of Terrain Indices And Landform Classification Procedures In Low-Relief Agricultural Fields, Derek A. Evans, Karl W. J. Williard, Jon E. Schoonover
Journal of Geospatial Applications in Natural Resources
Landforms control the spatial distribution of numerous factors associated with agronomy and water quality. Although curvature and slope are the fundamental surface derivatives used in landform classification procedures, methodologies for landform classifications have been performed with other terrain indices including the topographic position index (TPI) and the convergence index (CI). The objectives of this study are to compare plan curvature, the convergence index, profile curvature, and the topographic position index at various scales to determine which better identifies the spatial variability of soil phosphorus (P) within three low relief agricultural fields in central Illinois and to compare how two methods …
Comparative Analysis Of Xenorhabdus Koppenhoeferi Gene Expression During Symbiotic Persistence In The Host Nematode, Ruisheng An, Parwinder Grewal
Comparative Analysis Of Xenorhabdus Koppenhoeferi Gene Expression During Symbiotic Persistence In The Host Nematode, Ruisheng An, Parwinder Grewal
School of Earth, Environmental, & Marine Sciences Faculty Publications
Species of Xenorhabdus and Photorhabdus bacteria form mutualistic associations with Steinernema and Heterorhabditis nematodes, respectively and serve as model systems for studying microbe-animal symbioses. Here, we profiled gene expression of Xenorhabdus koppenhoeferi during their symbiotic persistence in the newly formed infective juveniles of the host nematode Steinernema scarabaei through the selective capture of transcribed sequences (SCOTS). The obtained gene expression profile was then compared with other nematode-bacteria partnerships represented by Steinernema carpocapsae-Xenorhabdus nematophila and Heterorhabditis bacteriophora-Photorhabdus temperata. A total of 29 distinct genes were identified to be up-regulated and 53 were down-regulated in X. koppenhoeferi while in S. scarabaei infective …
08. Engineering, Northeastern State University
08. Engineering, Northeastern State University
Oklahoma Research Day Abstracts
No abstract provided.
05. Chemistry, Northeastern State University
05. Chemistry, Northeastern State University
Oklahoma Research Day Abstracts
No abstract provided.
03. Biology, Northeastern State University
03. Biology, Northeastern State University
Oklahoma Research Day Abstracts
No abstract provided.
Temporal Variability In Large Grazer Space Use In An Experimental Landscape, Edward J. Raynor, Anthony Joren, Adam Skibbe, Mark Sowers, John M. Briggs, Angela N. Laws, Douglas Goodin
Temporal Variability In Large Grazer Space Use In An Experimental Landscape, Edward J. Raynor, Anthony Joren, Adam Skibbe, Mark Sowers, John M. Briggs, Angela N. Laws, Douglas Goodin
School of Natural Resources: Faculty Publications
Land use, climate change, and their interaction each have great potential to affect grazing systems. With anticipated more frequent and extensive future drought, a more complete understanding of the mechanisms that determine large grazer landscape-level distribution under varying climatic conditions is integral to ecosystem management. Using an experimental setting with contrasting fire treatments, we describe the inter-annual variability of the effect of landscape topography and disturbance from prescribed spring fire on large grazer space use in years of variable resource availability. Using GPS telemetry, we investigated space use of plains bison (Bison bison bison) as they moved among watersheds managed …
Sustainable Grassland Management: An Exploratory Study Of Progressive Ranchers In Nebraska, Stephanie M. Kennedy, Mark E. Burbach, Maggi S. Sliwinski
Sustainable Grassland Management: An Exploratory Study Of Progressive Ranchers In Nebraska, Stephanie M. Kennedy, Mark E. Burbach, Maggi S. Sliwinski
School of Natural Resources: Faculty Publications
Well-managed grasslands provide numerous ecosystem services. Ranchers who employ sustainable grazing practices limit grassland conversion and conserve critical habitats. This phenomenological study explored the grassland management decisions of progressive ranchers in Nebraska. Each individual interviewed for this study is proactive about the state of their grasslands, whether they are motivated by financial or conservation factors. Throughout the evolution of their businesses, these ranchers have taken steps to improve their management techniques and continue to employ new strategies while planning for the long-term productivity of their grasslands. For policy makers and educators seeking to improve grassland management decisions, demonstrating new methods …
Foraging Decisions Underlying Restricted Space Use: Effects Of Fire And Forage Maturation On Large Herbivore Nutrient Uptake, Edward J. Raynor, Anthony Joern, Jesse B. Nippert, John M. Briggs
Foraging Decisions Underlying Restricted Space Use: Effects Of Fire And Forage Maturation On Large Herbivore Nutrient Uptake, Edward J. Raynor, Anthony Joern, Jesse B. Nippert, John M. Briggs
School of Natural Resources: Faculty Publications
Recent models suggest that herbivores optimize nutrient intake by selecting patches of low to intermediate vegetation biomass. We assessed the application of this hypothesis to plains bison (Bison bison) in an experimental grassland managed with fire by estimating daily rates of nutrient intake in relation to grass biomass and by measuring patch selection in experimental watersheds in which grass biomass was manipulated by prescribed burning. Digestible crude protein content of grass declined linearly with increasing biomass, and the mean digestible protein content relative to grass biomass was greater in burned watersheds than watersheds not burned that spring (intercept; F1,251 …
The Role Of Open Lead Interactions In Atmospheric Ozone Variability Between Arctic Coastal And Inland Sites, Peter K. Peterson, Kerri A. Pratt, William R. Simpson, Son V. Nghiem, Lemuel X. Pérez Pérez, Eric J. Boone, Denis Pöhler, Johannes Zielcke, Stephan General, Paul B. Shepson, Udo Frieß, Ulrich Platt, Brian H. Stirm
The Role Of Open Lead Interactions In Atmospheric Ozone Variability Between Arctic Coastal And Inland Sites, Peter K. Peterson, Kerri A. Pratt, William R. Simpson, Son V. Nghiem, Lemuel X. Pérez Pérez, Eric J. Boone, Denis Pöhler, Johannes Zielcke, Stephan General, Paul B. Shepson, Udo Frieß, Ulrich Platt, Brian H. Stirm
Chemistry
Boundary layer atmospheric ozone depletion events (ODEs) are commonly observed across polar sea ice regions following polar sunrise. During March-April 2005 in Alaska, the coastal site of Barrow and inland site of Atqasuk experienced ODEs (O3 < 10 nmol mol-1) concurrently for 31% of the observations, consistent with large spatial scale ozone depletion. However, 7% of the time ODEs were exclusively observed inland at Atqasuk. This phenomenon also occurred during one of nine flights during the BRomine, Ozone, and Mercury EXperiment (BROMEX), when atmospheric vertical profiles at both sites showed near-surface ozone depletion only at Atqasuk on 28 March 2012. Concurrent in-flight BrO measurements made using nadir scanning differential optical absorption spectroscopy (DOAS) showed the differences in ozone vertical profiles at these two sites could not be attributed to differences in locally occurring halogen chemistry. During both studies, backward air mass trajectories showed that the Barrow air masses observed had interacted with open sea ice leads, causing increased vertical mixing and recovery of ozone at Barrow and not Atqasuk, where the air masses only interacted with tundra and consolidated sea ice. These observations suggest that, while it is typical for coastal and inland sites to have similar ozone conditions, open leads may cause heterogeneity in the chemical composition of the springtime Arctic boundary layer over coastal and inland areas adjacent to sea ice regions.