An Assessment of Air Quality in the Houston region:
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An Assessment of Air Quality in the Houston region: Investigating the ability to infer surface PM 2.5 from remote sensing measurements and examining possible aerosol sources. DEVELOP National Program NASA Langley Research Center.

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89th AMS Annual Meeting January 15, 2009

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89th ams annual meeting january 15 2009

An Assessment of Air Quality in the Houston region:Investigating the ability to infer surface PM2.5 from remote sensing measurements and examining possible aerosol sources

DEVELOP National Program

NASA Langley Research Center

89th AMS Annual Meeting January 15, 2009

11th Conference on Atmospheric Chemistry Session 10: Air pollution in mega cities in the world


Develop national program nasa langley research center

DEVELOP National ProgramNASA Langley Research Center

Principal Investigators:

Rebecca Legatt – University of Alaska - Fairbanks

Amy Sanders – The Pennsylvania State University

Erin Roberts – Embry-Riddle Aeronautical University

Laura Lynaugh – University of Virginia

Derek Doddridge – Tabb High School

Brianna Baxley – Grafton High School

Science Advisor:

Richard A. Ferrare, Ph.D. - NASA Langley Research Center


Outline

Outline

  • Community Concerns

  • Objectives

  • Phase One: verification and validation

  • Phase Two: aerosol events and sources

  • Conclusions

  • Future Work


Community concerns

Community Concerns

Air Quality

  • High PM2.5 (particulate matter) concentrations in the Houston area

    • Associated health risks

  • Sources of PM2.5 in Houston region


Objectives

Objectives

  • Improve analysis methods for forecasting surface PM2.5 concentrations in the Houston area

    • Investigate ground-truth of satellite observations

    • Analyze peak aerosol events

    • Research PM2.5 aerosol sources


Phase one outline

Phase One Outline

  • Show that AOD values can be highly variable

    • Displayed through Aqua/Terra images

  • Prove that ground-truth can be improved through several methods

    • Changing size of interest region

    • Including planetary boundary layer (PBL) height


Phase one

Phase One

  • Compared Aqua and Terra AOD

    • High correlation analysis: Sept. 13th, 2006

  • Ground-truth analysis of Terra AOD with surface PM2.5

    • Verified with available High Spectral Resolution Lidar (HSRL) measurements from Aug. – Sept. 2006


Phase one results

Phase One Results

Houston

Houston

  • Terra vs. Aqua AOD visualizations


Phase one results1

Phase One Results


Phase one1

Phase One

  • Further research to find a stronger correlation between surface and satellite measurements

    • Decreased the size of interest region

    • Modeled J. Al Saadi’s study and divided by the planetary boundary layer (PBL) height


Phase one results2

Phase One Results

Region of Interest

Houston

Latitude

Surface Stations

within 8 miles

Longitude


Phase two outline

Phase Two Outline

  • Several sources of AOD in Houston region

    • Local Sources

    • Foreign Sources

  • Many tools combined can backtrack possible AOD sources

    • Aqua/Terra visualization

    • HYSPLIT model

    • CALIPSO curtain plot


89th ams annual meeting january 15 2009

Phase Two

  • Visualized AOD with Terra satellite image

    • High AOD values on Aug. 28th, 2006

  • Utilized HYSPLIT to provide possible back trajectories to emission sources

  • Verified high AOD values with CALIPSO curtain plot

    • Dust signature supported Saharan dust arrival on Aug. 28th, 2006.


Phase two results

Phase Two Results

August 28, 2006 Terra AOD 10:30 A.M.

Houston

Latitude


Phase two results1

Phase Two Results


Phase two results2

Phase Two Results


Phase two results3

Phase Two Results


Phase two results4

Phase Two Results

Aug 27 8 UTC


89th ams annual meeting january 15 2009

Phase Two Results

August 28, 2006 Terra AOD 10:30 A.M.

Houston

Latitude

Longitude

HYSPLIT initialization

Points

CALIPSO track

Possible dust

Aug 27 8 UTC


Conclusions

Conclusions

  • AOD values can change relatively quickly

    • 3 hour time difference between Terra and Aqua showed large variance

    • Could be weather-related

  • Low PM2.5/AOD correlation can be improved

    • Decrease region of interest

    • Divide by PBL height

  • Utilizing multiple tools can provide back trajectories for AOD sources


Future work

Future Work

  • Investigate local mesoscale and microscale meteorological features

  • Look into horizontal and temporal aerosol variability

  • Study ozone concentrations in the region

  • Focus in on specific emission sites


Future work1

Future Work

Provide legislators with information to make informed decisions concerning air quality for the Houston region and beyond


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