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Limonene 50ppb on Beta-Caryo SOA

Limonene 50ppb on Beta-Caryo SOA. 25.06.2008. Lights on at 10:11. 20 min of lights. AMS is measuring much more than the DMPS at this stage. 37ugm-3. 178ugm-3. Less than 2 hours of light number and mass passed their peaks.

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Limonene 50ppb on Beta-Caryo SOA

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  1. Limonene 50ppb onBeta-Caryo SOA 25.06.2008

  2. Lights on at 10:11

  3. 20 min of lights

  4. AMS is measuring much more than the DMPS at this stage

  5. 37ugm-3

  6. 178ugm-3

  7. Less than 2 hours of lightnumber and mass passed their peaks

  8. The PTRMS is showing that the beta-caryo has already been consumed.. This is much faster than what was suggested from the Nov campaign results. • O3 formation is a good indicator for beta-caryo consumption.. It really works

  9. An update (2.5h of lights).. • Number and mass peaked • PTRMS: no more beta-caryo left • O3 is forming (6ppb now) • NO is coming down (5ppb now) and NO2 is increasing (22ppb now) • Waiting for the rest of the NO to be converted to NO2 before starting dilution and limonene injection

  10. It appears like a second mode is coming in… no effect on the number though!

  11. After 3 hours of light, stopped the exp and flushed most of the bag onto a filter • Injected Limonene and diluted the bag • Injected more NO2 to get to 25ppb NOx but ended up with more than needed (47ppb) due to incomplete fill of the bag (mass came down to target)!

  12. Limonene 50ppb onto B-caryo SOA Mode and mass increased while cpc saw no nucleation…

  13. Nucleation started at ~ 14:15

  14. AMS and DMPS are now in fairly good agreement while when measuring beta-caryo SOA alone the AMS was around a factor of 3 higher!! Could the DMPS be loosing too much beta-caryo mass because of volatility??

  15. Dilution followed by fresh SOA formation

  16. Particles are getting really big now

  17. New fresh mode is growing

  18. Nucleation stopped and mass still increasing

  19. DMPS is seeing more mass than the AMS now!!! See next slide

  20. And the AMS is seeing two modes

  21. Mass has peaked (~2 hours of lights)

  22. Almost 4 hours of lights (second phase)

  23. Lights off 17:39

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