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Why study sea salt?

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.

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Why study sea salt?

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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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