Document Archives Modeling & Emissions Inventories

VOC/NOx Sensitivity Analysis

Posted Under: Modeling, Modeling, Ozone, Reports

 

In 2017, Ramboll Environ performed sensitivity analyses to estimate the effects that VOC and/or NOx emission reductions have on 2023 ozone design values in the Denver Metro/North Front Range nonattainment area.  A summary of this analysis was presented at the RAQC’s Modeling Forum on November 2, 2017, which can be found here.  An analysis tool was also developed as part of this effort, which allows users to view projected ozone design values for each monitoring site based on various levels of NOx and VOC reductions.

VOC/NOx Sensitivity Analysis Tool

2017 Ozone Modeling Forum

Posted Under: Modeling, Modeling, Modeling Forum, Ozone (8-Hour Standard), Stakeholder Meetings

 

Nov. 2nd, 2017
1:00 – 4:30PM

Agenda

Modeling Sensitives Overview – Ralph Morris

Local Source 2017 Ozone Source Apportionment Modeling (2011 Modeling Database) – Ralph Morris, Ramboll Environ

Contributions of International Emissions (2011 Modeling Platform) – Ralph Morris

2023 Ozone Projections and VOC/NOx Emissions Sensitivity Modeling – Ralph Morris

Front Range Air Pollution and Photochemistry Experiment (FRAPPÉ) and DISCOVER-AQ 2014 Regional Source Impact Analysis – Frank Flocke & Gabriele Pfister, NCAR

Comparison of Ozone Nonattainment Area Oil and Gas Inventories with Monitored Ambient VOC Precursors – Dale Wells, APCD

Discussion and Next Steps – RAQC Staff

2017 Source Apportionment Modeling Report Available

Posted Under: Modeling, Modeling, News Room - News, Ozone, Reports

 

As part of future ozone planning for the Denver Metro/North Front Range (DM/NFR) nonattainment area, the Regional Air Quality Council (RAQC) and Air Pollution Control Division (APCD) recently completed a report on ozone source apportionment modeling for the 2017 emissions year using the 2011 modeling database developed for the Moderate Area Ozone State Implementation Plan (SIP).  The report detailing this modeling effort is now available on the RAQC website (Denver/North Front Range Local Source 2017 Source Apportionment Modeling Using a 2011 Modeling Database).

In addition to the report, modeling results have been loaded into a Source Apportionment Visualization Tool (SA Vis Tool) that can be accessed through the Intermountain West Data Warehouse (IWDW).  Through this tool, users can isolate individuals monitors to see the source contributions on individual days and averaged over multiple days.

Beyond this modeling effort, the RAQC and APCD are also in the process of conducting sensitivity modeling that includes evaluation of:

  • 2023 future year modeling based on on-the-books reductions
  • Impact of both intrastate emissions controls outside Colorado and contributions of international emissions
  • Impact of broad Nitrogen Oxides (NOx) and/or Volatile Organic Compound (VOC) reductions at monitors in the DM/NFR nonattainment area

Upon completion of these sensitivity runs, the RAQC and APCD will be hosting a modeling forum to present results and discuss how the analyses play into future ozone planning efforts.

Please feel free to contact Amanda Brimmer, RAQC,  with any questions or comments.

2008 8-hour Ozone Standard SIP Modeling Effort

Posted Under: Modeling, Ozone (8-Hour Standard)

As part of the SIP development process, the RAQC has conducted photochemical modeling to demonstrate attainment of the ozone National Ambient Air Quality Standard (NAAQS).  Below are documents and reports related to the development of Chapter 4 – Attainment Demonstration and information on the ozone modeling forum.

2011 Base Case Modeling and Model Performance Evaluation Report – Sept. 2016

2017 Modeling and Attainment Demonstration Report – Sept. 2016

Preliminary Ozone Model Evaluation for the Denver 2011 4 KM Base Case (November 2015)

2008 Moderate Area SIP: 2011 and 2017 Base Case Emissions Inventory Briefing Paper (October 2015)

Attainment Demonstration Modeling for the Denver Metro/North Front Range 2017 8-Hour Ozone State Implementation Plan (SIP) – Draft Modeling Protocol (August 2015)

Denver Metro Area/North Front Range Nonattainment Area 2011 Emission Inventory – Draft  (July 2014)

Photochemical Dispersion Modeling Update

Posted Under: General Air Quality, Modeling, Ozone (8-Hour Standard), Presentations

Presented to the Regional Air Quality Council, April 8, 2016

Photochemical Dispersion Modeling Update, Ken Lloyd,RAQC and Dennis McNally, Alpine Geophysics

Modeling Forum

Posted Under: Modeling Forum, Ozone (8-Hour Standard), Stakeholder Meetings

Modeling Forum

Wednesday, May 4th, 2016
7:45am – 10:45am

Agenda

2011 Base Case Modeling and Model Performance Evaluation,  Ralph Morris, Ramboll Environ

2017 Future Case Modeling, Dennis McNally, Alpine Geophysics

Source Apportionment Plan, Ralph Morris, Ramboll Environ

Background Ozone, Ken Lloyd, RAQC

Weather Corrected Ozone Trends, Patrick Reddy, APCD

Handout:  Ozone Modeling Acronym List

 

Preliminary Ozone Model Evaluation for the Denver 2011 4 KM Base Case (November 2015)

Posted Under: Modeling, Ozone (8-Hour Standard), Reports

Preliminary Ozone Model Evaluation for the Denver 2011 4 KM Base Case (November 2015)

Prepared by: Ramboll Environ and Alpine Geophysics, November 2015

2008 Moderate Area SIP: 2011 and 2017 Base Case Emissions Inventory Briefing Paper (October 2015)

Posted Under: Modeling, Ozone (8-Hour Standard), Reports

2008 Moderate Area SIP: 2011 and 2017 Base Case Emissions Inventory Briefing Paper (October 2015)

Prepared by:  Amanda Brimmer, RAQC (October 2015)

Attainment Demonstration Modeling for the Denver Metro/North Front Range 2017 8-Hour Ozone State Implementation Plan (SIP) – Draft Modeling Protocol

Posted Under: Modeling, Ozone

Attainment Demonstration Modeling for the Denver Metro/North Front Range 2017 8-Hour Ozone State Implementation Plan (SIP) – Draft Modeling Protocol

Prepared by: Ramboll Environ US Corporation, August 2015

Denver Metro Area/North Front Range Nonattainment Area 2011 Emissions Inventory – DRAFT

Posted Under: Emissions Inventories, Ozone

Denver Metro Area/North Front Range Nonattainment Area 2011 Emission Inventory – Draft

Prepared By: Colorado Department of Health and Environment, July 17, 2014

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