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Understanding Chemical Markers for Sea Salt in Aerosol Data

Explore the importance of studying sea salt in tropospheric chemistry and the Regional Haze Rule. Learn how it serves as a reference material for air quality control. Analysis of marine days in aerosol samples. Instruments used include PIXE, XRF modules for PM sampling.

denise-dennis
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Understanding Chemical Markers for Sea Salt in Aerosol Data

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  1. Chemical markers for sea salt in IMPROVE aerosol data • Why study sea salt? • It plays an important global role in tropospheric chemistry and the radiation balance. • EPA is planning to add it to the Regional Haze Rule accounting scheme. • It can be viewed as a “standard reference material” in ambient air, useful for system QA/QC.

  2. SIME REDW CACO, MAVI PORE VIIS Areas of filled circles are proportional to numbers of “marine days” ( 1 ug/m3) during 2004. Size of open circles corresponds to 10 days (out of 122 total sampling days).

  3. Point Reyes  PIXE XRF 

  4. denuder Module A PM2.5 Teflon Module B PM2.5 nylon Module C PM2.5 quartz Module D PM10 Teflon Controller

  5. 25mm  37mm filters new filter supplier

  6. Point Reyes  PIXE XRF 

  7. aq aq aCl- bSO4= cNO3- dSO4= eNO3- fSO4= aNa+ 2bNa+ cNa+ 2dNH4+ eNH4+ 2fH+ aCl- bSO4= cNO3- dSO4= eNO3- fSO4= aNa+ 2bNa+ cNa+ 2dNH4+ eNH4+ 2fH+ gHNO3 hHCl gHNO3 hHCl denuder (a+2b+c)Na (2d+e)NH4 (a-2f-g)Cl (c+e+g)NO3 (b+d+f)SO4 (2f+g+h)HCl(g) RM ------ -------------- aCl (c+e)NO3 (b+d+f)SO4 Teflon Nylon

  8.  C = 13.2 ug/m3

  9. 1 ug/m3

  10. SW W NW Point Reyes

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