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Rudolf B. Husar March 10, 2006

Discussion of Natural Event Documentation High Winds, Corcoran and Bakersfield, California September 22, 2006. Rudolf B. Husar March 10, 2006. Key Evidence: High Winds -> High PM10. The SJV APCD makes a good case that high winds and high PM10 occurred in Corcoran & Bakersfield.

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Rudolf B. Husar March 10, 2006

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  1. Discussion of Natural Event DocumentationHigh Winds, Corcoran and Bakersfield, CaliforniaSeptember 22, 2006 Rudolf B. Husar March 10, 2006

  2. Key Evidence: High Winds -> High PM10 • The SJV APCD makes a good case that high winds and high PM10 occurred in Corcoran & Bakersfield

  3. MODIS Terra, 10:30 Local Time MODIS Terra, 13:30 Local Time MODIS Terra shows some pollution/smoke in the Southern SJV MODIS Aqua, 3 hours later shows that the pollution/smoke has been cleared by the high winds Neither image shows evidence of dust – not surprising since dust is hard to see over land

  4. AIRNOW PM2.5, Sep. 22, 2006, Local time • AIRNOW data are available along the SJ Valley 2006-09-22:14 2006-09-22:16 2006-09-22:18 2006-09-22:20 2006-09-22:22 2006-09-23:00 2006-09-23:02

  5. AIRNOW PM2.5 The dust peak is progressing from 12:00 in Modesto to 20:00 in Bakersfield Transport speed 0f 25 MPH would do it • There is an issue with the absolute times – don’t match with the SJV report Sacramento, ?? peak Modesto, 12:00 peak Corcoran, 16:00 peak Bakersfield, 20:00 peak

  6. Surface Visibility (Bext), Winds – Local Eastern Time ?? • The high winds were also ‘transported’ – moving southward • So, as the gust move southward it could create local dust wherever it peaks 2006-09-22:16 2006-09-22:22 2006-09-22:18 2006-09-22:20

  7. NAAPS Dust Model, Sep 22, 2006 (Times are GMT) • High surface dust concentrations are forecasted for California • In the early morning the highest winds & surface dust conc. Highest in N. California • By the afternoon, the winds & surface conc. highest over S. California 2006-09-22 00:00 2006-09-22 06:00 2006-09-22 12:00 2006-09-22 18:00 2006-09-23 00:00 2006-09-23 06:00

  8. PM10-PM25 Obs from the SJV Report • The PM10/PM2.5 ratio of 5-10 indicates fresh dust • But the broad peak in Bakersfield suggests that the dust there has been dispersed..

  9. Tentative Conclusion Tentative Conclusions • High winds were present to cause windblown dust • Short-term PM10 peaks are indicative of windblown dust • It was a Natural Dust Event Questions • Why is PM10 highest in Corcoran-Bakersfield? • Transport from the North is plausible Alternative Speculative Explanation by RBH (may be off) • The high wind gusts were moving southward • As the gust progressed, it kicked up local dust and caused the very high PM10

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