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Collector sealants and breathing. Final Report, 25 September 1978-31 December 1979

Description: The objectives of this program were: (1) to investigate the pertinent properties of a variety of possible sealants for solar collectors and identify the most promising candidates, and (2) to study the effect of breathing in flat-plate, thermal solar collector units. The study involved two types of sealants, Class PS which includes preformed seals or gaskets and Class SC which includes sealing compounds or caulks. It was the intent of the study to obtain data regarding initial properties of cand… more
Date: February 20, 1980
Creator: Mendelsohn, M A; Luck, R M; Yeoman, F A & Navish, Jr, F W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Probabilistic aspects of meteorological and ozone regional ensemble forecasts

Description: This study investigates whether probabilistic ozone forecasts from an ensemble can be made with skill; i.e., high verification resolution and reliability. Twenty-eight ozone forecasts were generated over the Lower Fraser Valley, British Columbia, Canada, for the 5-day period 11-15 August 2004, and compared with 1-hour averaged measurements of ozone concentrations at five stations. The forecasts were obtained by driving the CMAQ model with four meteorological forecasts and seven emission scenari… more
Date: March 20, 2006
Creator: Monache, L D; Hacker, J; Zhou, Y; Deng, X & Stull, R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Kalman-filter bias correction of ozone deterministic, ensemble-averaged, and probabilistic forecasts

Description: Kalman filtering (KF) is used to postprocess numerical-model output to estimate systematic errors in surface ozone forecasts. It is implemented with a recursive algorithm that updates its estimate of future ozone-concentration bias by using past forecasts and observations. KF performance is tested for three types of ozone forecasts: deterministic, ensemble-averaged, and probabilistic forecasts. Eight photochemical models were run for 56 days during summer 2004 over northeastern USA and southern… more
Date: March 20, 2006
Creator: Monache, L D; Grell, G A; McKeen, S; Wilczak, J; Pagowski, M O; Peckham, S et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Possible variations in atmospheric ozone related to the eleven year solar cycle

Description: Changes in ozone and other minor constituents resulting from eleven year variations in the solar flux between 180 and 300 nm reported by Heath and Thekaekara (8) are presented. Results were computed using a one-dimensional time dependent model that allows for all major feedbacks and time delays which may result from changing photolysis rates in the O/sub x/--NO/sub x/--HO/sub x/--ClO/sub x/ system. Since the 1950's the chlorine content of the stratosphere has been increasing. The effect of this… more
Date: April 20, 1978
Creator: Penner, J.E. & Chang, J.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impact of elevated CO2 and O3 on insect-mediated ecosystem processes in a northern deciduous forest

Description: Rising concentrations of atmospheric CO{sub 2} and O{sub 3} are altering the structure and function of forest ecosystems. Herbivorous insects are the major consumers in temperate deciduous forests, with the capacity to dramatically alter tree growth (via outbreaks), forest community composition and ecosystem dynamics (e.g., nutrient cycling). Until recently, however, experimental quantification of the impacts of CO{sub 2} and O{sub 3} on canopy herbivore communities and rates of defoliation and… more
Date: November 20, 2011
Creator: Lindroth, Richard L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Remote Sensing of Alpha and Beta Sources - Modeling Summary

Description: Evaluating the potential for optical detection of the products of interactions of energetic electrons or other particles with the background atmosphere depends on predictions of change in atmospheric concentrations of species which would generate detectable spectral signals within the range of observation. The solar blind region of the spectrum, in the ultra violet, would be the logical band for outdoor detection (see Figure 1). The chemistry relevant to these processes is composed of ion-molec… more
Date: October 20, 2005
Creator: Dignon, J; Frank, M & Cherepy, N
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report, "Laboratory Studies of the Role of Sea Salt Bromine in Determining Tropospheric Ozone"

Description: This document is a final report for the project DE-FG03-98ER62578, "Laboratory Studies of the Role of Sea Salt Bromine in Determining Tropospheric Ozone". It includes a technical summary, collaborations, educational contributions and the peer-reviewed scientific publications that have resulted from this research.
Date: June 20, 2005
Creator: Finlayson-Pitts, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HEALTH EFFECTS OF DIESEL EXHAUST: AN HEI PERSPECTIVE

Description: Diesel engines have many advantages, including good fuel economy, power, durability, lower emissions of some pollutants (such as carbon monoxide) and of carbon dioxide (a greenhouse gas). However, there are a number of concerns that need to be addressed: (1) emissions of nitrogen oxides (which contribute to ozone formation) and of particulate matter (PM); (2) questions about cancer and other health effects from exposure to diesel PM; and (3) as efforts to decrease emissions progress, a need to … more
Date: August 20, 2000
Creator: Warren, Jane
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Global emissions and models of photochemically active compounds

Description: Anthropogenic emissions from industrial activity, fossil fuel combustion, and biomass burning are now known to be large enough (relative to natural sources) to perturb the chemistry of vast regions of the troposphere. A goal of the IGAC Global Emissions Inventory Activity (GEIA) is to provide authoritative and reliable emissions inventories on a 1{degree} {times} 1{degree} grid. When combined with atmospheric photochemical models, these high quality emissions inventories may be used to predict … more
Date: May 20, 1993
Creator: Penner, J. E.; Atherton, C. S. & Graedel, T. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The new ozone monitor. Final report

Description: This report describes the development of an invention for measuring the concentration of ozone by measuring the heat evolved when the ozone is catalyzed and converted back to oxygen. This ozone monitor evolved through a number of prototype as described in the final report. The final instrument is accurate, reliable and can be installed as a part of a control system. This instrument can be built and calibrated for any necessary specific ozone concentration range. This instrument uses inexpensive… more
Date: September 20, 1994
Creator: Karlson, E.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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OZONE TREATMENT OF SOLUBLE ORGANICS IN PRODUCED WATER (FEAC307)

Description: Oil production is shifting from ''shallow'' wells (0-650 ft water depth) to off-shore, deep-water operations (>2,600 ft.). Production from these operations is now approaching 20%. By 2007, it is projected that as much as 70% of the U.S. oil production will be from deep-water operations. The crude oil from these deep wells is more polar, thus increasing the amount of dissolved hydrocarbons in the produced water. Early data from Gulf of Mexico (GOM) wells indicate that the problem with soluble… more
Date: March 20, 2001
Creator: Klasson, KT
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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