Recently, I’m trying to get chlorophyll values from level-3 bin products.

According to SeaWiFS Technical Report Vol. 32, the equation used to calculate the mean value of variable is:

mx = S1 / w

square(Sx) = S2 / w – square(mx)

Xmle = exp( mx + ½ * square(Sx) );

I assume that S1 is

**sum**and S2 is

**sum_square**. When I applied this equation, the results seem not right (e.g. maximum value can reach 10e11, all values are above 1). In contrast, If I remove exp, the results are more reasonable but which is not mentioned in NASA report. Could you give me some instructions about this question. Are other variables such as PIC being applied a log calculation as well?

Thanks,

Haipeng