Automated Low-cost Instrument for Measuring Total Column Ozone

Automated Low-cost Instrument for Measuring Total Column Ozone

Access: Use of this item is restricted to the UNT Community.
Date: May 2006
Creator: Nebgen, Gilbert Bernard
Description: Networks of ground-based and satellite borne instruments to measure ultraviolet (UV) sunlight and total column ozone have greatly contributed to an understanding of increased amounts of UV reaching the surface of the Earth caused by stratospheric ozone depletion. Increased UV radiation has important potential effects on human health, and agricultural and ecological systems. Observations from these networks make it possible to monitor total ozone decreases and to predict ozone recovery trends due to global efforts to curb the use of products releasing chemicals harmful to the ozone layer. Thus, continued and expanded global monitoring of ozone and UV is needed. However, existing automatic stratospheric ozone monitors are complex and expensive instruments. The main objective of this research was the development of a low-cost fully automated total column ozone monitoring instrument which, because of its affordability, will increase the number of instruments available for ground-based observations. The new instrument is based on a high-resolution fiber optic spectrometer, coupled with fiber optics that are precisely aimed by a pan and tilt positioning mechanism and with controlling programs written in commonly available software platforms which run on a personal computer. This project makes use of novel low-cost fiber optic spectrometer technology. A cost ...
Contributing Partner: UNT Libraries
The Ozone Layer: Ozone Depletion, Recovery in a Changing Climate, and the "World Avoided"

The Ozone Layer: Ozone Depletion, Recovery in a Changing Climate, and the "World Avoided"

Date: 2008
Creator: U.S. Global Change Research Program
Description: This brochure describes the role of ozone in the stratosphere, and the effect it has on ultraviolet light, as well as how the Montreal Protocol and subsequent laws have affected ozone-depleting pollutants in the atmosphere.
Contributing Partner: UNT Libraries
IPCC Expert Meeting on Emission Scenarios

IPCC Expert Meeting on Emission Scenarios

Date: 2005
Creator: Intergovernmental Panel on Climate Change
Description: This report summarizes the Expert Meeting on Emission Scenarios to help inform the fourth Assessment Report of the IPCC.
Contributing Partner: UNT Libraries
Air Quality Forecasting: A Review of Federal Programs and Research Needs

Air Quality Forecasting: A Review of Federal Programs and Research Needs

Date: June 2001
Creator: National Science and Technology Council (U.S.). Air Quality Research Subcommittee.
Description: This report provides a brief overview of the state of science of air quality forecasting. The report was composed to guide future federal research in air quality forecasting.
Contributing Partner: UNT Libraries
Executive Order 2010-06 : Governor's Policy on Climate Change

Executive Order 2010-06 : Governor's Policy on Climate Change

Date: October 2010
Creator: Brewer, Janice K.
Description: WHEREAS, Arizona was a founding member of the Western Climate Initiative (WCI) in February 2007; WHEREAS, the United States Environmental Protection Agency (USEPA) finalized regulations mandating GHG reporting, effective on December 29, 2009,...WHEREAS, it is critical that Arizona stay informed of and influence any federal regulation and legislation relating to climate change and capping of GHG emission...NOW, THEREFORE, I, Janice K. Brewer, Governor of the State of Arizona,...hereby order and direct as follows: 4. The Climate Change Oversight Group ("Group") is established and charged with monitoring the continued work of the WCI...11. The Group and this Executive Order shall expire December 31, 2012
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Environmental Effects of Ozone Depletion: 1994 Assessment

Environmental Effects of Ozone Depletion: 1994 Assessment

Date: November 1994
Creator: United Nations Environment Programme
Description: A change in the composition of the stratosphere becomes relevant to society only if it has noticeable effects. This places the assessment of effects in a pivotal role in the problem of ozone depletion. Decreases in the quantity of total-column ozone, as now observed in many places, tend to cause increased penetration of solar UV-B radiation (290-315 nm) to the Earth's surface. UV-B radiation is the most energetic component of sunlight reaching the surface. It has profound effects on human health, animals, plants, microorganisms, materials and on air quality. Thus any perturbation which leads to an increase in UV-B radiation demands careful consideration of the possible consequences. This is the topic of the present assessment made by the Panel on Environmental Effects of Ozone Depletion.
Contributing Partner: UNT Libraries
Ozone

Ozone

Date: 2002
Creator: NASA Earth Observatory
Description: In the stratosphere, ozone is created primarily by ultraviolet radiation. When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen. A freed oxygen atom then combines with another oxygen molecule to form a molecule of ozone. There is so much oxygen in our atmosphere, that these high-energy ultraviolet rays are completely absorbed in the stratosphere.
Contributing Partner: UNT Libraries
Ozone

Ozone

Date: 2002
Creator: NASA Earth Observatory
Description: Although it represents only a tiny fraction of the atmosphere, ozone is crucial for life on Earth. Depending on where ozone resides, it can protect or harm life on Earth.
Contributing Partner: UNT Libraries
Ozone

Ozone

Date: 2002
Creator: NASA Earth Observatory
Description: The term "ozone depletion" means more than just the natural destruction of ozone, it means that ozone loss is exceeding ozone creation.
Contributing Partner: UNT Libraries
Ozone

Ozone

Date: 2002
Creator: NASA Earth Observatory
Description: The amount and distribution of ozone molecules in the stratosphere varies greatly over the globe. Ozone molecules are transported around the stratosphere much as water clouds are transported in the troposphere. Therefore, scientists observing ozone fluctuations over just one spot could not know whether a change in local ozone levels meant an alteration in global ozone levels, or simply a fluctuation in the concentration over that particular spot. Satellites have given scientists the ability to overcome this problem because they provide a picture of what is happening daily over the entire Earth.
Contributing Partner: UNT Libraries
Impacts of Fracking on Local Ozone Pollution in DFW Area

Impacts of Fracking on Local Ozone Pollution in DFW Area

Date: 2014
Creator: Ahmadi, Mahdi & John, Kuruvilla
Description: Poster for the 2014 University of North Texas (UNT) Graduate Exhibition. This poster discusses the impacts of fracking on local ozone pollution in the Dallas-Fort Worth area.
Contributing Partner: UNT College of Arts and Sciences
Impact of Natural Gas Hydraulic Fracturing on Ozone Pollution in Dallas-Fort Worth Area

Impact of Natural Gas Hydraulic Fracturing on Ozone Pollution in Dallas-Fort Worth Area

Date: June 10, 2014
Creator: Ahmadi, Mahdi & John, Kuruvilla
Description: Poster for the 2015 Global Emission Initiative (GEIA) Conference. This poster discusses the impact of natural gas hydraulic fracturing on ozone pollution in the Dallas-Fort Worth area.
Contributing Partner: UNT College of Arts and Sciences
An Evaluation of the Correlation Between Shale Gas Development and Ozone Pollution within the Barnett Shale Region

An Evaluation of the Correlation Between Shale Gas Development and Ozone Pollution within the Barnett Shale Region

Date: September 4, 2014
Creator: Ahmadi, Mahdi & John, Kuruvilla
Description: Presentation for the 2014 Fracturing Impacts and Technologies Conference. This presentation discusses an evaluation of the correlation between shale gas development and ozone pollution within the Barnett Shale region.
Contributing Partner: UNT College of Arts and Sciences
Predicting Hourly Ozone Pollution in Dallas-Fort Worth Area Using Spatio-Temporal Clustering

Predicting Hourly Ozone Pollution in Dallas-Fort Worth Area Using Spatio-Temporal Clustering

Date: May 20, 2015
Creator: Ahmadi, Mahdi; Huang, Yan & John, Kuruvilla
Description: Presentation for the 2015 GeoComputation Annual Conference. This presentation discusses predicting hourly ozone pollution in the Dallas-Fort Worth area using spatio-temporal clustering.
Contributing Partner: UNT College of Arts and Sciences
Evaluation of Three Major Emission Sources on DFW Ozone Level Using Photochemical Modeling

Evaluation of Three Major Emission Sources on DFW Ozone Level Using Photochemical Modeling

Date: March 7, 2015
Creator: Ahmadi, Mahdi & John, Kuruvilla
Description: Poster for the 2015 University of North Texas (UNT) Graduate Exhibition. This poster discusses the evaluation of three major emission sources on the Dallas-Fort Worth ozone levels using photochemical modeling.
Contributing Partner: UNT College of Arts and Sciences
Ozone Impact of Shale Gas Activities in Dallas-Fort Worth Metroplex

Ozone Impact of Shale Gas Activities in Dallas-Fort Worth Metroplex

Date: 2015
Creator: Ahmadi, Mahdi & John, Kuruvilla
Description: Poster for the 2015 Graduate Student Symposium of the Federation of North Texas Area Universities. This poster discusses the ozone impact of shale gas activities in the Dallas-Fort Worth metroplex.
Contributing Partner: UNT College of Arts and Sciences
Ozone Pollution of Shale Gas Activities in North Texas

Ozone Pollution of Shale Gas Activities in North Texas

Date: May 2016
Creator: Ahmadi, Mahdi
Description: The effect of shale gas activities on ground-level ozone pollution in the Dallas-Fort Worth area is studied in detail here. Ozone is a highly reactive species with harmful effects on human and environment. Shale gas development, or fracking, involves activities such as hydraulic fracturing, drilling, fluid mixing, and trucks idling that are sources of nitrogen oxides (NOX) and volatile organic compounds (VOC), two of the most important precursors of ozone. In this study two independent approaches have been applied in evaluating the influences on ozone concentrations. In the first approach, the influence of meteorology were removed from ozone time series through the application of Kolmogorov-Zurbenko low-pass filter, logarithmic transformation, and subsequent multi-linear regression. Ozone measurement data were acquired from Texas Commission on Environmental Quality (TCEQ) monitoring stations for 14 years. The comparison between ozone trends in non-shale gas region and shale gas region shows increasing ozone trends at the monitoring stations in close proximity to the Barnett Shale activities. In the second approach, the CAMx photochemical model was used to assess the sensitivity of ozone to the NOX and VOC sources associated with shale oil and gas activities. Brute force method was applied on Barnett Shale and Haynesville Shale emission ...
Contributing Partner: UNT Libraries
Evaluation of Anthropogenic Air Emissions from Marine Engines in a Coastal Urban Airshed of Texas

Evaluation of Anthropogenic Air Emissions from Marine Engines in a Coastal Urban Airshed of Texas

Date: April 2, 2013
Creator: Farooqui, Zuber M.; John, Kuruvilla & Sule, Neelesh
Description: This article provides a brief description of the adopted methodology for estimating anthropogenic emission estimation of ocean going vessels and barges.
Contributing Partner: UNT College of Engineering
Conceptual Framework for the Development of an Air Quality Monitoring Station in Denton, Texas

Conceptual Framework for the Development of an Air Quality Monitoring Station in Denton, Texas

Date: August 2016
Creator: Boling, Robyn
Description: Denton, Texas consistently reaches ozone nonattainment levels. This has led to a large focus of air pollution monitoring efforts in the region, with long-range transport being explored as a key contributor. For this study, the University of North Texas Discovery Park campus was chosen as a prospective location for an extensive air quality monitoring station. Sixteen years of ozone and meteorological data for five state-run monitoring sites within a 25 mile radius, including the nearest Denton Airport site, was gathered from TCEQ online database for the month of April for the years 2000 to 2015. The data was analyzed to show a historical, regional perspective of ozone near the proposed site. The maximum ozone concentration measured at the Denton Airport location over the 16 year period was measured at 96 ppb in 2001. Experimental ozone and meteorological measurements were collected at the Discovery Park location from March 26 to April 3 and April 8 to April, 2016 and compared to the Denton Airport monitoring site. A time lag in ozone trends and an increase in peak ozone concentrations at the proposed location were observed at the proposed site in comparison to the Denton Airport site. Historical and experimental meteorological data ...
Contributing Partner: UNT Libraries
Development of Wireless Sensor Network System for Indoor Air Quality Monitoring

Development of Wireless Sensor Network System for Indoor Air Quality Monitoring

Date: December 2012
Creator: Borkar, Chirag
Description: This thesis describes development of low cost indoor air quality (IAQ) monitoring system for research. It describes data collection of various parameters concentration present in indoor air and sends data back to host PC for further processing. Thesis gives detailed information about hardware and software implementation of IAQ monitoring system. Also discussed are building wireless ZigBee network, creating user friendly graphical user interface (GUI) and analysis of obtained results in comparison with professional benchmark system to check system reliability. Throughputs obtained are efficient enough to use system as a reliable IAQ monitor.
Contributing Partner: UNT Libraries
Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas

Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas

Date: August 2015
Creator: Lim, Guo Quan
Description: Emissions of air pollutants from non-conventional sources have been on the rise in the North Texas area over the past decade. These include primary pollutants such as volatile organic compound (VOC) and oxides of nitrogen (NOx) which also act as precursors in the formation of ozone. Most of these have been attributed to a significant increase in oil and gas production activities since 2000 within the Barnett Shale region adjacent to the Dallas-Fort Worth metroplex region. In this study, air quality concentrations measured at the Denton Airport and Dallas Hinton monitoring sites operated by the Texas Commission on Environmental Quality (TCEQ) were evaluated. VOC concentration data from canister-based sampling along with continuous measurement of oxides of nitrogen (NOx), ozone (O3), particulate matter (PM2.5), and meteorological conditions at these two sites spanning from 2000 through 2014 were employed in this study. The Dallas site is located within the urban core of one of the fastest growing cities in the United States, while the Denton site is an exurban site with rural characteristics to it. The Denton Airport site was influenced by natural gas pads surrounding it while there are very few natural gas production facilities within close proximity to the Dallas ...
Contributing Partner: UNT Libraries