Presentation is loading. Please wait.

Presentation is loading. Please wait.

Bay breeze enhanced air pollution event in Houston, Texas during the DISCOVER-AQ field campaign Christopher P. Loughner (University of Maryland) Melanie.

Published byHarry Hines Modified over 9 years ago

Similar presentations

Presentation on theme: "Bay breeze enhanced air pollution event in Houston, Texas during the DISCOVER-AQ field campaign Christopher P. Loughner (University of Maryland) Melanie."— Presentation transcript:

1 Bay breeze enhanced air pollution event in Houston, Texas during the DISCOVER-AQ field campaign Christopher P. Loughner (University of Maryland) Melanie Follette-Cook (Morgan State University) Kenneth E. Pickering (NASA Goddard Space Flight Center) Mark Estes (Texas Commission on Environmental Quality) Funded by: NASA DISCOVER-AQ and Texas AQRP

2 Introduction Event: High air pollution event occurred September 25-26, 2013 in Houston, TX during the DISCOVER-AQ campaign. Northerly transport and sea and bay breezes were in place during this event. Science Question: What were the roles of regional vs. local emissions, regional transport, and sea and bay breezes on this air pollution event?

3 DISCOVER-AQ (Deriving Information on Surface conditions from Column and VERtically resolved observations relevant to Air Quality) Houston deployment: September 2013 9 flight days conducting spirals and missed approaches throughout the Houston metropolitan area. Numerous other ground-based measurements (Pandora UV/Vis spectrometers, AERONET sunphotometers, in-situ stationary and mobile platforms, ozonesondes, and tethersondes).

4 Maximum 8 hour average ozone during September 2013 Houston deployment: September 2013 Onshore flow during most of the campaign September 25 was the exception – Northerly transport into Houston – Sea and bay breezes caused pollutants to recirculate

5 September 25: 6 of the 15 sites shown violated EPA’s maximum 8 hour average ozone standard September 26: 2 of the 15 sites shows violated EPA’s maximum 8 hour average ozone standard Maximum 8 hour average ozone during September 20-30, 2013

6 Conroe 101 85 Jones Forest 94 90 Texas 119 89 City La Porte 151 124 Seabrook 132 104 Air Monitoring Sites in Houston Region Sept. 25:peak ozone near western shore of Galveston Bay 1-hr 8-hr Max (ppbv) Sept. 26:peak ozone NW of Houston

7 HYSPLIT Backtrajectories from NAM model output initialized at 2000 UTC over LaPorte Sylvan Beach September 25: North-northwesterly wind transport into Houston September 26: Continental air transported over the Gulf of Mexico and then back inland over Houston

8 Time period: 28 August – 2 October, 2013 Re-initialize WRF every 3 days Length of each WRF run: 3.5 days (first 12 hours of each run is discarded) Initial and Boundary Conditions: North American Regional Reanalysis and MOZART Chemical Transport Model CMAQ run offline WRF-CMAQ Simulations 4 km 12 km 36 km

9 Weather Research and Forecasting (WRF) Version 3.6.1 Model Options RadiationLW: RRTM; SW: Goddard Surface LayerPleim-Xiu Land Surface ModelPleim-Xiu Boundary LayerACM2 CumulusKain-Fritsch MicrophysicsWSM-6 NudgingObservational and analysis nudging DampingVertical velocity and gravity waves damped at top of modeling domain SSTsMulti-scale Ultra-high Resolution (MUR) sea surface temperature analysis (~1 km resolution) CMAQ Version 5.0.2 Model Options Chemical MechanismCB05 AerosolsAE5 Dry depositionM3DRY Vertical diffusionACM2 Emissions2012 TCEQ anthropogenic emissions BEIS calculated within CMAQ

10 September 24 Northerly winds present day prior to air pollution episode.

11 September 24 Northerly winds present day prior to air pollution episode. CMAQ simulates high ozone offshore associated with northerly transport. Maximum 8 hour average ozone

12 September 25 back trajectories from 4 km WRF output initialized at 2 pm CST over La Porte Sylvan Beach at 0.5 km AGL (red), 1.0 km AGL (green), and 2.0 km AGL (blue); D=Dallas Trajectories pass over Dallas

13 September 25 6 am CST: Observations – calm winds Model – northwesterly transport into Houston

14 September 25 6 am CST: Observations – calm winds Model – northwesterly transport into Houston 2 pm CST: Bay and sea breeze form. Model simulates weaker bay and sea breezes.

15 September 25 3 pm CST: Observations reveal the bay breeze front located near the middle of Houston, while CMAQ shows it to the south.

16 September 25 3 pm CST: Observations reveal the bay breeze front located near the middle of Houston, while CMAQ shows it to the south. Obs: peak ozone over Galveston and Galveston Bay. CMAQ: peak ozone over Galveston Maximum 8 hour average ozone

17 P-3B and CMAQ ozone profile over Galveston Observations reveal high ozone around 975mb and low ozone at the surface. Model does not capture the observed profile shape. High model bias at surface due to weaker simulated sea and bay breezes. P-3B (black) CMAQ (red)

18 September 26 6 am CST: Weak winds, stagnant conditions overnight.

19 6 am CST: Weak winds, stagnant conditions overnight. 3 pm CST: Southeasterlies. September 26

20 6 am CST: Weak winds, stagnant conditions overnight. 3 pm CST: Southwesterlies. Southeasterly transport results in peak ozone being located northwest of Houston. Maximum 8 hour average ozone

21 Conclusions and Future Work WRF simulated weaker sea and bay breezes than observed, which resulted in low ozone biases inland and a high bias at Galveston. WRF and CMAQ also did not agree with the shape of the ozone profile over Galveston. Future WRF sensitivity tests will be performed to try to improve the bay and sea breeze model representation (increase model resolution to 1 km; nudging finer domains?). Investigate the role of local vs regional (Dallas) emissions on this air pollution episode.

Download ppt "Bay breeze enhanced air pollution event in Houston, Texas during the DISCOVER-AQ field campaign Christopher P. Loughner (University of Maryland) Melanie."

Similar presentations

Improving the View of Air Quality from Space Jim Crawford Science Directorate NASA Langley.

Improving the View of Air Quality from Space Jim Crawford Science Directorate NASA Langley.
Fong (Fantine) Ngan and DaeWon Byun IMAQS, Department of Earth Sciences, University of Houston 7 th Annual CMAS Conference, October 6th, 2008.

Fong (Fantine) Ngan and DaeWon Byun IMAQS, Department of Earth Sciences, University of Houston 7 th Annual CMAS Conference, October 6th, 2008.
Office of Research and Development National Exposure Research Laboratory, Atmospheric Modeling and Analysis Division Changes in U.S. Regional-Scale Air.

Office of Research and Development National Exposure Research Laboratory, Atmospheric Modeling and Analysis Division Changes in U.S. Regional-Scale Air.
Click to edit Master title style Click to edit Master subtitle style 1 Modeling of 1,3-Butadiene for Urban and Industrial Areas B. Rappenglück and B. Czader.

Click to edit Master title style Click to edit Master subtitle style 1 Modeling of 1,3-Butadiene for Urban and Industrial Areas B. Rappenglück and B. Czader.
An Intercomparison of Surface Observations and High-Resolution Forecasting Model Output for the Lake Okeechobee Region By Kathryn Shontz July 19, 2006.

An Intercomparison of Surface Observations and High-Resolution Forecasting Model Output for the Lake Okeechobee Region By Kathryn Shontz July 19, 2006.
An Overview of Ozone and Precursor Temporal and Spatial Variability in DISCOVER-AQ Study Regions Ken Pickering, NASA GoddardScott Janz, NASA Goddard James.

An Overview of Ozone and Precursor Temporal and Spatial Variability in DISCOVER-AQ Study Regions Ken Pickering, NASA GoddardScott Janz, NASA Goddard James.
1 Ken Pickering Project Scientist NASA GSFC The 2013 DISCOVER-AQ Field Campaigns in the San Joaquin Valley of California and.

1 Ken Pickering Project Scientist NASA GSFC The 2013 DISCOVER-AQ Field Campaigns in the San Joaquin Valley of California and.
Rice University Tropospheric Ozone Pollution Project (RU-TOPP) Gary A. Morris.

Rice University Tropospheric Ozone Pollution Project (RU-TOPP) Gary A. Morris.
Center for Satellite Applications and Research (STAR) Review 09 – 11 March 2010 Figure 1: August 2006 RAQMS and Observed TOC Figure 2: September 2 nd,

Center for Satellite Applications and Research (STAR) Review 09 – 11 March 2010 Figure 1: August 2006 RAQMS and Observed TOC Figure 2: September 2 nd,
Sensitivity to changes in HONO emissions from mobile sources simulated for Houston area Beata Czader, Yunsoo Choi, Lijun Diao University of Houston Department.

Sensitivity to changes in HONO emissions from mobile sources simulated for Houston area Beata Czader, Yunsoo Choi, Lijun Diao University of Houston Department.
How sensitive are trace gas concentrations to the method used to parameterize clouds within CMAQ? Christopher P. Loughner 1, Dale J. Allen 1, Russell R.

How sensitive are trace gas concentrations to the method used to parameterize clouds within CMAQ? Christopher P. Loughner 1, Dale J. Allen 1, Russell R.
Objective: Work with the WRAP, CenSARA, CDPHE, BLM and EPA Region 8 to use satellite data to evaluate the Oil and Gas (O&G) modeled NOx emission inventories.

Objective: Work with the WRAP, CenSARA, CDPHE, BLM and EPA Region 8 to use satellite data to evaluate the Oil and Gas (O&G) modeled NOx emission inventories.
Impact of Mexico City on Regional Air Quality Louisa Emmons Jean-François Lamarque NCAR/ACD.

Impact of Mexico City on Regional Air Quality Louisa Emmons Jean-François Lamarque NCAR/ACD.
Office of Research and Development Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory Simple urban parameterization for.

Office of Research and Development Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory Simple urban parameterization for.
Texas Rural Air Monitoring Sites Sonia Uribe November 16, 2004.

Texas Rural Air Monitoring Sites Sonia Uribe November 16, 2004.
National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Tropospheric Emission Spectrometer Evaluating.

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Tropospheric Emission Spectrometer Evaluating.
Muntaseer Billah, Satoru Chatani and Kengo Sudo Department of Earth and Environmental Science Graduate School of Environmental Studies Nagoya University,

Muntaseer Billah, Satoru Chatani and Kengo Sudo Department of Earth and Environmental Science Graduate School of Environmental Studies Nagoya University,
1 Ken Pickering Project Scientist NASA GSFC Evaluation of CMAQ and WRF-Chem Simulations of Air Quality over the Baltimore-Washington.

1 Ken Pickering Project Scientist NASA GSFC Evaluation of CMAQ and WRF-Chem Simulations of Air Quality over the Baltimore-Washington.
Template Improving Sources of Stratospheric Ozone and NOy and Evaluating Upper Level Transport in CAMx Chris Emery, Sue Kemball-Cook, Jaegun Jung, Jeremiah.

Template Improving Sources of Stratospheric Ozone and NOy and Evaluating Upper Level Transport in CAMx Chris Emery, Sue Kemball-Cook, Jaegun Jung, Jeremiah.
Oceanic and Atmospheric Modeling of the Big Bend Region Steven L. Morey, Dmitry S. Dukhovksoy, Donald Van Dyke, and Eric P. Chassignet Center for Ocean.

Oceanic and Atmospheric Modeling of the Big Bend Region Steven L. Morey, Dmitry S. Dukhovksoy, Donald Van Dyke, and Eric P. Chassignet Center for Ocean.

Similar presentations

Ads by Google