Below is a list of technical reports relevant to OTAG. The reports can be physically located on any Web, FTP, or Gopher server. If you have a relevant report on a web server then you can add it to this list by clicking the "Submit New Entry" button. If you would like to place the report on the OTAG Web Server then contact OTAG Support


Meteorological Summary of 1998 Ozone Season, Mid-Atlantic Region
Bill Ryan at UMD has recently posted a draft summary of 1998 meteorological conditions (global, regional, and local) associated with ozone forcasts and observed ozone concentrations in the Mid-Atlantic region. This summary may also be of interest to others investigating meteorological influences on ozone or other pollutants (like PM-2.5) in nearby areas of the Eastern US or Atlantic Canada. on 10/27/98 RecID: 1

CLIMATOLOGY OF OZONE SYNOPTIC SCALE TRANSPORT IN THE EASTERN US
An extended abstract summarizing results from forward and backward trajectory analyses conducted for the OTAG Air Quality Analysis Workgroup by VT DEC and CAPITA.
Submitted by Schichtel Bret on 10/1/97 RecID: BretSchichtel4

PAMS Data Analysis: An Investigation of Local Meteorological Effects on Ozone During the OTAG 1995 Episode and the Weekday/Weekend Differences in the Northeast Corridor examined.
This study examined the behavior of ozone and its precursors during the 1995 OTAG episode (i.e., 7-18 July 1995) at sites in the northeast corridor using PAMS data ( Washington DC, Baltimore, Philadelphia, and New York, upwind and down wind of Baltimore). It was found that when exceedances took place, temperatures and solar radiation were consistently higher than those found on the average non-exceedance day. The wind speed and directions were highly variable. Secondary mid day maximums in the NOx distribution developed when a local wind minimum developed. Weekdays has higher average NMHC than weekends but there was more ozone on the weekends.
Submitted by Vukovich Jeff on 8/26/97 RecID: JeffVukovich

Ozone as a Function of Local Wind Speed and Direction. July 26, 97 update
This is an update of an early, May 7, 97 version of the same paper. The figures and animations have chaged slightly; the text has been expanded considerably. The subjective interpretation of results may continue to change. Critical comments and feedback is most welcome.
Submitted by Husar Rudolf on 8/6/97 RecID: RudolfHusar11

Volume I: EXECUTIVE SUMMARY (Rev June 13, 1997) with animations
Final version of the Air Quality Analysis Workgroup's Volume I: Executive Summary with animations. It is a compilation of key results from the OTAG Air Quality Analysis Workgroup The zipped file can be found here.
Submitted by Guinnup Dave on 6/25/97 RecID: Dave Guinnup15

Spatial Clustering of Ambient Ozone in Eastern U.S.
Ambient ozone data from AIRS data were used to perform a simple analysis of the spatial correlation structure of daily maximum 8-hour ozone levels. The purpose of the analysis was to determine the extent to which covariation among several hundred monitoring stations could be summarized by a small number of clusters (4 to 12) and to determine how these clusters appear geographically. The data used in this analysis were taken from AIRS for all monitoring stations east of the 100th longitude from June through September of 1991 through 199
Submitted by Webmaster on 6/18/97 RecID: Webmaster17

Final Report, Volume III: Summaries of Individual AQAWG Analyses OTAG Air Quality Analysis Workgroup
A brief summary and critical review was prepared for most of the AQAWG analyses identified in Table 1 in Volume II: Summary and Integration of Results. These summaries provide a description of the purpose, methodology, and major findings of each study and are intended as a resource for quick reference in lieu of turning to the full study report(s).
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup14

PowerPoint OTAG AQA WG Presentation (Rev, June 13, 97 )
Revision of the Slides-and-bullets presentation of the AQA WG Executive Summary Report to the Policy Group - referred to as the KYSOFF (Knock Your Socks OFF) presentation. An MS PowerPoint, version 97, is also available for download.
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup13

OTAG Air Quality Analysis Workgroup Results Summary
Final version of the OTAG Air Quality Analysis Workgroup Results Summary. It is the four page AQAWG summary that will be included in the OTAG Executive Summary. A zipped version of the document in Word for Windows 97 format can be downloaded. A zipped file of a version in Word 6.0 here.
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup12

Volume I: EXECUTIVE SUMMARY (Rev June 13, 1997)
Final version of the Air Quality Analysis Workgroup's Volume I: Executive Summary. It is a compilation of key results from the OTAG Air Quality Analysis Workgroup. The previous version of this document can be viewed. A zipped version of the document in Word for Windows 97 format can be downloaded. A version in Word 6.0 is available.
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup11

Volume II: Summary and Integration of Results OTAG Air Quality Analysis Workgroup
Final version of the Air Quality Analysis Workgroup's Volume II: Summary and Integration of Results OTAG Air Quality Analysis Workgroup. Summaries of individual AQAWG analyses were reveiwed and used as the basis for an integrated assessment. The previous version of this document can be viewed. A zipped version of the document in Word for Windows 97 format can be downloaded. A Word 6.0 version is also available.
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup10

Volume III: Final Summaries of Individual AQAWG Analyses OTAG Air Quality Analysis Workgroup
Final version of the Air Quality Analysis Workgroup's Volume III: Summaries of Individual AQAWG Analyses OTAG Air Quality Analysis Workgroup. These summaries provide a description of the purpose, methodology, and major findings of each study and are intended as a resource for quick reference in lieu of turning to the full study report(s). The previous version of this document can be viewed. A zipped version of the document in Word for Windows 97 format can be downloaded. A Word 6.0 version is abailable
Submitted by Guinnup Dave on 6/16/97 RecID: DaveGuinnup9

Final Report, Volume III: Summaries of Individual AQAWG Analyses OTAG Air Quality Analysis Workgroup
A brief summary and critical review was prepared for most of the AQAWG analyses identified in Table 1 in Volume II: Summary and Integration of Results. These summaries provide a description of the purpose, methodology, and major findings of each study and are intended as a resource for quick reference in lieu of turning to the full study report(s).
Submitted by Guinnup Dave on 6/12/97 RecID: DaveGuinnup8

Final Report, Volume II: Summary and Integration of Results OTAG Air Quality Analysis Workgroup
During the summer months, high ground-level ozone concentrations are observed within and downwind of many of the large urban areas in the eastern US. Peak hourly average concentrations exceed the current National Ambient Air Quality Standard (NAAQS) for ozone of 0.12 ppm and peak 8-hour average concentrations rise above the recently proposed revised ozone NAAQS level of 0.08 ppm.
Submitted by Guinnup Dave on 6/12/97 RecID: DaveGuinnup7

Anatomy of the July 1995 Regional Ozone Episode
An animation illustrating how airmass stagnation and circulation over the Midwest leads to accumulation of ozone over which is subsequently transport to downwind states.
Submitted by Schichtel Bret on 6/11/97 RecID: BretSchichtel3

Final Report, Volume II: Summary and Integration of Results and Vol III
During the summer months, high ground-level ozone concentrations are observed within and downwind of many of the large urban areas in the eastern US. Peak hourly average concentrations exceed the current National Ambient Air Quality Standard (NAAQS) for ozone of 0.12 ppm and peak 8-hour average concentrations rise above the recently proposed revised ozone NAAQS level of 0.08 ppm.
Submitted by Guinnup Dave on 6/5/97 RecID: DaveGuinnup6

PowerPoint OTAG AQA WG Presetation (Rev, June 2, 97
Revision of the Slides-and-bullets presentation of the AQA WG Executive Summary Report to the Policy Group - referred to as the KYSOFF (Knock Your Socks OFF) presentation . An MS PowerPoint, 97 version is also available .
Submitted by Husar Rudolf on 6/1/97 RecID: RudolfHusar10

Volume I: EXECUTIVE SUMMARY (Rev June 2, 1997)
Revised version of the Air Quality Analysis (AQA) workgroup Executive Summary to the Policy Group.
Submitted by Guinnup David on 6/1/97 RecID: DavidGuinnup5

Volume I: EXECUTIVE SUMMARY (Rev May 26, 1997)
Revised version of the Air Quality Analysis (AQA) workgroup Executive Summary to the Policy Group.
Submitted by Guinnup David on 5/26/97 RecID: DavidGuinnup4

Volume II: EXECUTIVE SUMMARY (Rev May 8, 1997)
Revised version of the Air Quality Analysis (AQA) workgroup Executive Summary Volume II to the Policy Group.
Submitted by Stoeckenius Till on 5/9/97 RecID: TillStoeckenius1

OTAG Air Quality Analysis Results Relevant to Assessment of Coarse Grid States (Draft)
Summary of AQA results relevant to the Policy group's discussion of UAM-V fine grid ozone contributions from locations in the coarse grid.
Submitted by Poirot Richard on 5/9/97 RecID: RichardPoirot8

Ozone as a Function of Local Wind Direction and Wind Speed: Evidence of Local and Regional Transport
A way to examine the role of ozone transport is to classify the ozone concentration data (1986-95) into wind direction and wind speed ranges. The data show that at low wind speeds ozone is localized but at moderate and high speeds (>6 m/s) the ozone 'plumes' from sources areas are highly directional. It is argued that the method may potentially yield separate estimate of the regional and local ozone.
Submitted by Husar Rudolf on 5/7/97 RecID: RudolfHusar9

OTAG AQA WG Presetation to the Policy Group, Cleveland, June 2, 97
Slides-and-bullets presentation of tha AQA WG Executive Summary Report to the Policy Group - referred to as the KYSOFF (Knock Your Socks OFF) presentation . An MS PowerPoint version is also available . Due to the abundance of (another 20) stakeholder presentations at the May-Chicago meeting, the AQAWG presentation has been postponed to the Cleveland, June 2-3 meeting. There is ample time for feedback and improvements!
Submitted by Husar Rudolf on 5/6/97 RecID: RudolfHusar8

Ozone in Hazy Air Masses
This is an ozone transport report from our historical archives, 1976.A case study of high ozone concentrations in a synoptic scale hazy air mass over the eastern half of the U.S. shows large areas with elevated ozone levels, whose location and spatial extent correspond roughly with those of the hazy 'blobs'. Long term observations in St. Louis show the prevalence of high ozone levels on hazy days.
Submitted by Husar Rudolf on 5/1/97 RecID: RudolfHusar7

OTAG Air Quality Analysis Workgroup Results Summary (Rev May 2, 1997)
Revisision of the '2 page' Air Quality Analysis (AQA) workgroup summary, to be submitted to Wolcoff.
Submitted by Guinnup David on 4/30/97 RecID: DavidGuinnup3

Volume I: EXECUTIVE SUMMARY (Rev May 2, 1997)
Revised version of the Air Quality Analysis (AQA) workgroup Executive Summary to the Policy Group.
Submitted by Guinnup David on 4/30/97 RecID: DavidGuinnup2

Regional Ozone Patterns in the Eastern U.S. 1985-1995: Statistical Pattern Analysis and Classification and Regression Tree (CART) Analysis in Support of the Ozone Transport and Assessment Group (OTAG) Modeling Effort
[Note: Figures are available in hardcopy from WALCOFF (703) 267-3594]

This report summarizes an analysis of the meteorological and ozone air quality conditions observed throughout the Eastern U.S. during the period 1985-1995. The primary objectives of this study were to (1) examine the meteorological and air quality characteristics of the Ozone Transport Assessment Group (OTAG) modeling episodes (LADCO, 1995), (2) identify important features of the episode periods, and (3) determine the frequency of occurrence of the associated (spatial and temporal) ozone concentration patterns and meteorological conditions.

Submitted by Belle Hudischewskyj on 4/16/97 RecID: Webmaster7

CLASSIFICATION OF OZONE EPISODES FOR FOUR SOUTHERN CITIES ACCORDING TO TRANSPORT CHARACTERISTICS
[Note: Figures are available in hardcopy from WALCOFF (703) 267-3594]

This report summarizes the results of an ozone episode classification analysis that was performed for the cities of Atlanta, Birmingham, Charlotte, and Nashville using the Classification and Regression Tree (CART) analysis technique as the primary classification tool. The overall objective of the analysis was to characterize ozone exceedance days for the four urban areas as either predominantly "home grown" (resulting from locally emitted pollutants) or resulting from pollutant transport. Following classification of the exceedance days, the potential influence of transport with respect to attainment of the federal ozone standard was also examined.

Submitted by Belle Hudischewskyj on 4/16/97 RecID: Webmaster6

CLASSIFICATION AND REGRESSION TREE ANALYSIS TO SUPPORT THE SELECTION OF EPISODES FOR REGIONAL-SCALE PHOTOCHEMICAL MODELING OF THE SOUTHEASTERN U.S.
[Note: Figures are available in hardcopy from WALCOFF (703) 267-3594]

This report documents the episode selection analysis that was performed to support the identification of a regional-scale ozone episode (with emphasis on the southeastern U.S.) to be modeled as part of the Ozone Transport Assessment Group (OTAG) super-regional modeling effort. The objectives of the episode selection analysis were to identify episodes:

Submitted by Belle Hudischewskyj on 4/15/97 RecID: Webmaster5

Announcement to the OTAG Policy Group, April 15, 1997
In light of the extensive presentations from stakeholders planned for the April OTAG Policy Group meeting, the Air Quality Analysis workgroup will not be presenting its monthly update to the Group. Instead, we will be focussing our efforts on preparing a knock-your-socks-off presentation for the May meeting. This presentation will re-cap and summarize the most salient results from the myriad analyses emanating from our workgroup. This handout also contains a list of technical papers on our website which in some fashion address analyses of model performance related to air quality data.
Submitted by Guinnup David on 4/9/97 RecID: DavidGuinnup1

OTAG Air Quality Analysis Workgroup Results Summary
As requested by the OTAG commisioners, I have been working on a 2-page summary for the AQAWG. After much whittling away, I have gotten the 2-page summary down to 3 pages. It's pretty dilute, but maybe it hits the mark for some. Please look it over and let me know your thoughts before I heave it onto the web and forward it to Walcoff (who requested it be submitted 2 weeks ago). Any other suggestions for distillation? Have I watered down too much? Is the emphasis off? I'm tempted to leave it at 3 pages,and not distil further before turning it in, but I will be glad to listen to any suggestions you may have....
Submitted by Guinnup David on 4/9/97 RecID: DavidGuinnup

Summary: Transport, Mixing Phenomena and Model Performance over the Northeast.
This summary was prepared as an informational document for use by the OTAG Air Quality Analysis Workgroup. Two complementary assessments were performed and are summarized here. (1) Transport and mixing phenomena related to ozone exceedances in the northeast U.S. were examined using data from 1995 NARSTO-Northeast measurements. (2) Results of the OTAG modeling for the northeast U.S. were evaluated using available air quality data for 1988 and 1991 and using air quality and meteorological data from NARSTO-Northeast for 1995. Stand-alone reports were prepared for each of these assessments.
Submitted by Blumenthal Don on 4/1/97 RecID: DonBlumenthal

EVALUATION OF THE UAM-V MODEL PERFORMANCE IN THE NORTHEAST REGION FOR OTAG EPISODES
This report is in DRAFT form. It is the second part of an assessment of regional transport issues in the Northeast and how well the transport and its effects are represented by models applied to the area.
Submitted by Frederick Lurmann on 3/31/97 RecID: Webmaster4

Comparison of Modeled versus Observed Isoprene Concentrations
UAM-V model output for the 1995 OTAG episode was compared with field observations from 16 rural and suburban sites operated by N-NE,SOS/Nashville and PAMS. Afternoon values were compared in order to eliminate, or at least minimize, vertical gradients and transitory excursions in isoprene concentration.
Submitted by Edgerton Eric on 3/18/97 RecID: EricEdgerton2

PHASE I COMPARISON OF OTAG UAM-V/BEIS2 MODELING RESULTS WITH AMBIENT ISOPRENE AND OTHER RELATED SPECIES CONCENTRATIONS
A preliminary analysis was conducted using readily available ambient air quality data to compare observed isoprene concentrations with concentrations predicted by the Ozone Transport Assessment Group (OTAG) UAM-V photochemical model simulations for the July 10-18, 1995 episode.
Submitted by Ralph Morris on 3/18/97 RecID: Webmaster3

TRANSPORT AND MIXING PHENOMENA RELATED TO OZONE EXCEEDANCES IN THE NORTHEAST U.S. (ANALYSES BASED ON NARSTO-NORTHEAST DATA)
This report has been prepared as an informational document for use by the OTAG Air Quality Analysis Workgroup. The report is based on analyses of NARSTO-Northeast data. It is a working draft document and has not been peer reviewed or reviewed by the NARSTO-Northeast participants. All conclusions are those of the authors and not of NARSTO-Northeast or the sponsors. It is being circulated for review and comment and will be revised in response to comments received. Suggestions for ways to clarify or improve the material are welcome.
Submitted by Donald Blumenthal on 3/11/97 RecID: Webmaster2

Quality of Explanation: Thinking about and using air quality models
Slides from the presentation at the February 26 OTAG meeting. This document is in the Acrobat PDF format and requires the Acrobat reader to view.
Submitted by Jeffries Harvey on 2/25/97 RecID: HarveyJeffries

Historical Perspective on the Climatological Potential for
A necessary precondition for the transport of "high" concentrations of ozone or ozone precursors from a "source area" to a "receptor area" is a degree of "local" pollution accumulation in or near the source area. Key factors which influence local pollution accumulation include local emissions density and local meteorology (especially mixing depth and wind speed). During the 1960's and early 1970's, there was considerable interest in evaluating the long-term "climatological" potential for local pollution episodes. Many of these historical evaluations were conducted strictly from a meteorological perspective - i.e. without regard to emissions densities. As such, they can provide a useful complement to recent OTAG modeling and Air Quality Analysis results. In particular, they may provide useful insights into the following general OTAG AQA observations...
Submitted by Poirot Richard on 2/24/97 RecID: RichardPoirot7

Seasonal Pattern of Ozone over the OTAG Region
Maps show an 'ozone hole' in the winter and on ozone bulge in the summer stretching over the industrial Midwest and the Mid-Atlantic states. The spring values are higher than in the fall. The ozone exceedances show strong peak in July for the 120 ppb threshold but flat from June to August for the 80 ppb threshold. The fraction of exceedances that occur within the April-September season is about 95% irrespective whether the threshold is set at 80 or 120 ppb.
Submitted by Husar Rudolf on 2/18/97 RecID: RudolfHusar6

Final Report for the OTAG Air Quality Analysis Workgroup--Volume I: EXECUTIVE SUMMARY
The Air Quality Analysis (AQA) workgroup of OTAG has been formed to develop analyses based on air quality data which can be used to independently check or complement analytical results developed through OTAG emission-based modeling efforts. Specifically, the workgroup's purpose statement reads...
Submitted by Stoeckenius Till on 2/13/97 RecID: TillStoeckenius

Update on the Characterization of Transport over the Eastern US
This report presents the continuation of the work to characterize the summer time transport over the Eastern US during high and low ozone conditions for the years 1991 - 1995.
Submitted by Schichtel Bret on 2/10/97 RecID: BretSchichtel2

Status Report to OTAG Air Quality Analysis Workgroup: 12/3/96
This provides an update of a backward air trajectory analysis project conducted for the OTAG Air Quality Analysis Workgroup by VT DEC. Also summarized here are results of inter-site and inter-regional correlations among afternoon ozone concentrations at the 23 trajectory sites, and areas of convergence among these and other OTAG AQA studies.
Submitted by Poirot Richard on 1/27/97 RecID: RichardPoirot6

Analysis of Ozone, NOy and Tracer Data from a Site in South-Central Pennsylvania
This report examines the behavior of O3, CO, SO2 and NOy at a rural site in south-central Pennsylvania including the covariation of CO and SO2 with NOy. Periods of elevated O3 are classified based on the abundance of CO (automotive emissions) and SO2 (point source emissions) relative to NOy. Results indicate that of the 21 periods of elevated O3 in the summer of 1995, 7 were classified as "predominantly urban", while the remaining 14 were classified as "mixed" (elevated CO and SO2).
Submitted by Edgerton Eric on 1/6/97 RecID: EricEdgerton1

Status Report to OTAG Air Quality Analysis Workgroup: 11/7/96
The current report presents results of "concentration-based trajectory sorting" for 7 Summers (1989-95) for 23 ozone monitoring sites in the OTAG domain, for selected subsets of the ozone distribution (lower 50th percentile and upper 50th, 25th, 10th and 5th percentile concentrations). The results are generally consistent with previous "location-based sorting" results, and suggest that: the OTAG region is geographically well-configured to address zone transport; local stagnation is most important in the South; and that industrial Midwest exhibits a high probability contributing to peak ozone concentrations at many sites throughout the OTAG domain.
Submitted by Poirot Richard on 12/9/96 RecID: RichardPoirot5

A Comparison of Modeled and Measured Ozone, NOy and CO at Nine Regional Monitoring Stations during the 1995 OTAG Episode
UAM-V base D2 model output and surface measurements of ozone, NOy and CO were compared at nine regional air quality monitoring sites for the July 1995 OTAG model episode. The comparison showed reasonable agreement between mean ozone concentrations and in the ozone-NOy relationship while NOy and CO concentrations did not agree as well. Under conditions where the model predicted the highest ozone concentrations, model predictions of all three species showed a significant positive bias. This model overprediction may be important when the base case is compared to control scenarios.
Submitted by Hartsell Ben on 11/24/96 RecID: BenHartsell

Preliminary Proposal: Evaluation of the Effect of a 12 KM Grid on OTAG Modeling Results.
This preliminary proposal is submitted by the TVA for review and comments by the OTAG modeling groups and other interested parties. It should be viewed as a ‘strawman’, its purpose is to generate discussion of the purpose and methods of the proposed analysis. But as the schedule makes clear, time is extremely short for accomplishing this task. Comments will have to be received by November 29 to be considered in the revised proposal.
Submitted by Imhoff Robert on 11/23/96 RecID: RobertImhoff

Preparation of Ozone Files for Data Analysis and Model Comparison
Ozone related air quality data from seven different data sources were acquired and prepared in a set format for use by the OTAG Air Quality and Modeling Workgroups. The description of data sets and procedures for reformatting and quality control analysis are described.
Submitted by Husar Rudolf on 11/18/96 RecID: RudolfHusar5

Summary of Ozone Transport
The purpose of this document is to present the finding and conclusions from studies conducted by the OTAG Air Quality Analysis workgroup which applies to the transport of ozone and its precursors.
Submitted by Schichtel Bret on 11/10/96 RecID: BretSchichtel1

Areas of Violation over the OTAG Region
The Air Quality Analysis workgroup has conducted an evaluation and pattern analysis of areas of violation (1hr and 8hr) over the OTAG region. The a crudely definined AOVs are delineated on maps of the OTAG region.
Submitted by Husar Rudolf on 11/6/96 RecID: RudolfHusar4

Ozone/NOy/Tracer Relationships at Three SCION Sites
The purpose of this analysis was to examine the behavior of O3 and other trace gases at three rural sites in the southeast, and to determine whether other long-lived atmospheric species (namely CO and SO2) could be used as tracers of NOy.
Submitted by Edgerton Eric on 11/4/96 RecID: EricEdgerton

Spatial Pattern of Daily Maximum Ozone over the OTAG Region
The OTAG region is surrounded by tropospheric ozone concentrations of 30-40 ppb and the average ozone within OTAG is about 60 ppb. The main OTAG ozone pool resides over the Ohio River Valley and also over major metropolitan areas. The role of regional ozone appear to be more important for nonattainmnet areas of the Northeast then over the South.
Submitted by Husar Rudolf on 9/23/96 RecID: RudolfHusar3

Weekly Pattern of Ozone over the OTAG Region
The number of ozone exceedences ( >120 ppb ) over the OTAG region are three times higher on Fridays then on Sundays. This suggests that the current weekday-weekend differences in emissions would be enough to reduce future exceedences by factor of three.
Submitted by Husar Rudolf on 9/23/96 RecID: RudolfHusar2

VT DEC Air Trajectory Analysis of Long-Term Ozone Climatology
A summary of the applications of backward trajectory analyses conducted for the OTAG Air Quality Analysis Workgroup by VT DEC. The approach employs the NOAA HY-SPLIT model to calculate several thousand backward air trajectories for 23 non-urban ozone monitoring sites with reasonably complete data capture over the past 7 Summers.
Submitted by Poirot Richard on 9/23/96 RecID: RichardPoirot4

Pattern of 8-Hour Daily Maximum Ozone over the OTAG Region
The spatial pattern of 8hr and 1hr day max ozone are compared. On the average, the 8hr day max is about 85% of the 1hr day max ozone. The 8hr standard would tend to increase the exceedances in the Ohio River Valley and decrease it in the vicinity Houston, New York and other highly variable urban source areas.
Submitted by Husar Rudolf on 9/17/96 RecID: RudolfHusar1

Source Regions of Influence for High and Low Ozone Conditions in the Eastern US
Submitted by Bret Schichtel on 8/26/96 RecID: BretSchichtel

Statistical Characteristics of Spectrally-Decomposed Ambient Ozone Time Series Data
Submitted by Van Hook Bryan on 8/26/96 RecID: VanHookBryan

HY-SPLIT and CAPITA Monte Carlo Model Back Trajectory Comparison
A qualitative comparison between back trajectories generated from the HY-SPLIT and CAPITA Monte Carlo model
Submitted by Bret Schichtel on 7/3/96

NARSTO-NE 1995 Summer Ozone Study
Description of the 1995 NARSTO-NE summer ozone study.
Submitted by Jeffrey West on 6/20/96 RecID: JeffreyWest1

NARSTO-NE Data Management Plan
This report presents the plan for archiving and disseminating air quality and meteorological data collected as part of NARSTO-NE.
Submitted by Jeffrey West on 6/20/96 RecID: JeffreyWest

Uncertainty in the Spatial Interpolation of Ozone Monitoring Data
Spatial interpolation is a frequently applied process in estimating air pollutant concentrations. A common interpolation technique is the inverse distance weighted interpolation (1/rn). Two general factors that influence the interpolation procedure are the type of data used and the "setting" of the interpolation, i.e. the number of stations used and the weighing factor. The of data used in this work were hourly ozone from the EPA's Aerometric Information Retrieval System (AIRS) and Clean Air Status and Trends Network (CASTNet) networks for the eastern U.S. The AIRS monitoring sites were coded to distinguish among urban, suburban and rural locations.
Submitted by Stefan R. Falke on 6/3/96 RecID: Webmaster1

Southern Oxidant Study - Reports and Documents
A list of SOS documents on the SOS Web server. Requires Adobe viewer.
Submitted by Webmaster on 5/29/96 RecID: Webmaster

Air Trajectory Residence Time Analysis Investigation of Ozone Transport Pathways: 1989-95
"Trajectory Analysis" has been identified on the task list of the OTAG Air Quality Analysis Workgroup. VT DEC had agreed to devote some in-kind resources to assist in conducting this task. We have a copy of the NOAA HY-SPLIT trajectory model (Draxler, 1992), and NOAA NGM meteorological data sets for the years 1989 through 1995 for Eastern North America (East of 105 degrees Longitude).
Submitted by Richard Poirot on 4/3/96 RecID: RichardPoirot3

Comments on Draft ENVIRON Ozone Review Report
Evaluation and comments on the ENVIRON Corp. report: Review of Recent Ozone Measurements and Modeling Studies in the Eastern U.S. Submitted to OTAG Modeling and Air Quality Analysis Workgroups.
Submitted by Richard Poirot on 1/14/96 RecID RichardPoirot

Preview of 1994 Ozone Precursor Concentrations in the NEast US
Report of the NESCAUM Ambient Monitoring and Assessment Committee. Includes PAMS data sets; selected episodes; VOC/NOx ratios; composition, reactivity, toxicity; VOC sources and transformations; transport; NY City data.
Submitted by Richard Poirot on 12/22/95 RecID RichardPoirot1

1992 Regional Ozone Concentrations in the Northeastern United States
1992 Regional Ozone Concentrations in the Northeastern United States Report of the NESCAUM Ambient Monitoring and Assessment Committee. Includes quality assurance, spatial-temporal pattern, transport issues, long term trends.
Submitted by Richard Poirot on 12/22/95 RecID RichardPoirot2

Sulfur and Nitrogen Emission Trends for the U.S
A production and material flow-based sulfur and nitrogen emission trend analysis, yearly 1850-1980 for each US state
Submitted by Rudolf Husar on 12/22/95 RecID RudolfHusar

The CAPITA Regional Monte Carlo Model
A paper describing the CAPITA regional air quality model, based on the Monte Carlo approach. Includes testing and calibration ambient data; trajectory calculations.
Submitted by Bret Schichtel on 12/22/95 RecID BretSchichtel


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