PARAFAC Abnormality solution

PARAFAC Analysis results from Stephen et al., 2016 (STE) PARAFAC Analysis results from Zhou et al., 2016 (JGLR) PARAFAC Analysis results from Xu and Guo., 2016 (WR)

Abnormality: abrupt decline of some peaks

Compared with literatures

Walker et al. 2013

Stedmon & Markager 2005

Stedmon et al 2003

Hypothesis: Cut EEMs improperly

FirstOrderCut = [-40 15];
SecondOrderCut = [-40 15];
InsertedData = [NaN 0];
for i = 1:2
    if FirstOrderCut(i) ~= NaN
        for j = 1: length(Ex)
            k = find (Em<Ex(j)-FirstOrderCut(i));
            X(:,k,j) = InsertedData(i);
        end
    end
    if SecondOrderCut (i) ~= NaN
        for j = 1:length(Ex)
            k = find (Em>Ex(j)*2.05+SecondOrderCut(i));
            X(:,k,j) = InsertedData(i);
        end
    end
end

Demostration:

Solution:

InsertedData = [NaN NaN]

Results:

Introduction of samples

Samples:

Yukon River downstream

Sampling time:

2004-2005

Sample categories:

colloidal organic matter (>1kDa), low molecular weight organic matter (<1kDa), dissolved organic matter (<0.45e-6 m)

Before program revised:

3 components decomposed by PARAFAC program:

4 components from PARAFAC:

After revised:

3 components decomposed by PARAFAC program:

4 components from PARAFAC:

Comparison