Description Usage Arguments Details Value Note Author(s) References See Also Examples
This function is applied when we already have black carbon concentration processed by ONA algorithm. Since Black carbon concentration measured by AE51 substantially decreases when the filter loading goes up, we can apply filter correction function to adjust for that.
1 | filter_loading(data, ONA_BC = "BC_ONA", ATN = "ATN")
|
data |
a datafram containing the raw data of black carbon. |
ONA_BC |
the column having black carbon concentration processed by ONA algorithm. |
ATN |
the column having ATN coefficient. |
This method is applicable even when the raw files are compiled as it uses the corresponding ATN values to correct for filter loading of black carbon concentration
The default mthod returns a vector with equal length as the dataframe.
Higly recommend to read the reference before using the function
Sanjeev Bista (MPH - Advanced Bio-statistics and Epidemiology)
Kirchstetter, T.W., Novakov, T., 2007. Controlled generation of black carbon particles from a diffusion flame and applications in evaluating black carbon measurement methods. Atmospheric Environment 41, 1874-1888 Available from: https://doi.org/10.1016/j.atmosenv.2006.10.067
1 2 3 4 5 6 7 8 9 10 | data(data_ONA)#loading the example dataset
#calculating ONA processed black carbon first
data_ONA$ONA_BC<-ONA(data=data_ONA, ATN = "ATN", BC ="BC", dATN =0.05)
filter_loading(data =data_ONA, ATN = "ATN", ONA_BC="BC")
## The function is currently defined as
function (data, ONA_BC = "BC_ONA", ATN = "ATN")
{
data[, ONA_BC] * (0.88 * exp(-(data[, ATN])/100) + 0.12)^(-1)
}
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