f(rh),f’(rh)are relative humidity adjustment factors applied to the light scattering efficiency (tobe described in greater detail shortly), dimensionless,

SO4 is the mass associated with sulfates, ug/m3,

NO3 is the mass associated with nitrates, ug/m3,

OC is the mass associated with organic carbon, ug/m3,

EC is the mass associated with elemental carbon, ug/m3,

Fine Soil is inorganic primary particulate matter (excluding primary sulfate and nitrate particles)

associated with soil components with aerodynamic diameter < 2.5 um, :g/m3,

CM is coarse particulate matter with aerodynamic diameter > 2.5 um, but < 10 um, ug/m3,

brayleigh is light-scattering attributable to Rayleigh scattering, Mm-1 (i.e., inverse “mega-meters”),

assumed to be 10 Mm-1.

bext is the estimated extinction coefficient, Mm-1.

New IMPROVE Algorithm

The IMPROVE program has recently revised the IMPROVE algorithm (IMPROVE,

2006); (Hand, 2006) . The new algorithm is intended to reduce biases in light extinction

estimates compared to the old algorithm. The new algorithm is somewhat more complicated

than the old algorithm as follows:

bext.2.2 x fs(RH) x [Small Sulfate] + 4.8 x fL(RH) x [Large Sulfate]+ 2.4 x fs(RH) x [Small Nitrate] + 5.1 x fL(RH) x [Large Nitrate]

+ 2.8 x {Small Organic Mass] + 6.1 x [Large Organic Mass]

+ 10 x [Elemental Carbon]

+ 1 x [Fine Soil]

+ 1.7 x fss(RH) x [Sea Salt]

+ 0.6 x [Coarse Mass]

+ Rayleigh Scattering (site specific)

+ 0.33 x [NO2 (ppb)]

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castellano: DISPER CUSTIC DESCAR RADIA italiano:

castellano: DIS CUS DES RAD english: DIS CUS DES RAD

português: DIS CUS DES RAD italiano: DIS CUS DES RAD