f(rh), f’(rh) are relative humidity adjustment factors applied to the light scattering efficiency (to

be 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)]

 

n701 - n702 - n703 - n704 - n705 - n706 - n707 - n707 - n709 - n710 - n711 - n712 - n713 - n714 - n715 - n716 - n717 - n718 - n719 - n720 - n721 - n722 - n723 - n724 - n725 - n726 - n727 - n728 - n729 - n730 - n731 - n732 - n733 - n734 - n735 - n736 - n737 - n738 - n739 - n740 - n741 - n742 - n743 - n744 - n745 - n746 - n747 - n748 - n749 - n750

 

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