2004-09-28 July 4, 2004 Aerosol Pulse


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2004-09-28 July 4, 2004 Aerosol Pulse

  1. 1. FASTNET Event Report: 040705July4Haze, July 6, 2004 July 4, 2004 Aerosol Pulse Event Summary by the FASTNET Community Please send PPT slides or comments to Erin Robinson or Rudy Husar , CAPITA Visit the event discussion forum
  2. 2. Background <ul><li>During the US Independence day celebrations on July 4 th , fireworks cause the emission of considerable smoke in most populated areas </li></ul><ul><li>While it is a sort-term aerosol event, the fireworks smoke has a measurable impact on the local aerosol pattern </li></ul><ul><li>Earlier analyses of IMPROVE aerosol chemistry data have shown that fireworks smoke has a strong signature, rich in potassium ( Poirot, 1998 ) </li></ul><ul><li>The FASTNET data shown here also demonstrates that the fireworks cause a strong short-term pulse of the PM2.5 concentration in most urban areas. </li></ul><ul><li>A community analysis activity could quantify the magnitude, significance and relevance of this phenomenon. </li></ul>
  3. 3. Previous work: The July 4th Potassium Spike (Poirot 1998) <ul><li>Potassium nitrate is a major component of all fireworks (provides the bang!). </li></ul><ul><li>Fine particle K for all IMPROVE data (1988-1997) were averaged for each day of year </li></ul><ul><li>The potassium spike on July 5 is 120 ng/m3 compared to 40-60 during the year </li></ul><ul><li>The corresponding IMPROVE-average daily fine mass did not show the spike </li></ul><ul><li>The K spike is clearly something to consider (and perhaps screen out) in conducting any analyses using K data </li></ul>
  4. 4. FASTNET Analysis: AIRNOW PM25 Hourly data <ul><li>Hourly PM25 concentrations are averaged over all the AIRNOW sites (~300) </li></ul><ul><li>Late on July 4 and early July 5, the average PM2.5 increased from 12 to 35 ug/m3 </li></ul><ul><li>An aerosol pulse of the same magnitude occurred on July 4, 2003 </li></ul><ul><li>Thus, the July 4-5 smoke pulse is clearly discernable in the mass concentration data </li></ul>
  5. 5. AIRNOW PM25 Maps, July 4, 5, 2004 <ul><li>AIRNOW PM25 mass concentration shows urban hot-spots </li></ul><ul><li>The aerosol pulse first appeared in the East and subsequently in the West </li></ul><ul><li>See the GIF animation for the hourly pattern </li></ul>12:00 00:00 04:00 16:00 08:00 20:00
  6. 6. ASOS Light Scattering <ul><li>Hourly ASOS scattering is averaged over all the ASOS_STI sites (~200) </li></ul><ul><li>Conspicuous is the absence of ANY trace of the July 4 spike </li></ul><ul><li>Note: ASOS sites are at airports; many AIRNOW sites are downtown </li></ul>
  7. 7. Discussion Issues <ul><li>Why is the PM25 mass spike so strong in AIRNOW but not in the IMPROVE data? </li></ul><ul><li>Is the fireworks smoke significant on regional scale? </li></ul><ul><li>How to handle the July 4 th data in the source apportionment models (UNMIX, PMF) </li></ul><ul><li>Is the PM25 and potassium pulse useful for further tracer analysis? </li></ul>
  8. 8. July 4, 2004 Aerosol Pulse <ul><li>The US-avg. AIRNOW PM25 shows a 3 hr. spike at midnight </li></ul><ul><li>In the (airport) ASOS the July 4 spike is conspicuously absent </li></ul><ul><li>Thus, the US spike is due to the urban sites affected by smoke </li></ul>00:00 04:00 08:00 20:00 AIRNOW PM25 AIRNOW PM25 US Hourly Average ASOS Bext US Hourly Average Pulse No Pulse