Does North et al. (1982) suggest area-weighting using the square root of the cosine of latitude before EOF analysis?

11 November 2018 0 6K Report

Majority of climate studies dealing with EOF analysis refer to North et al. (1982) paper suggesting area-weighting using the square root of the cosine of latitude prior to EOF analysis. It is indeed almost standard procedure. However, I have read the paper several times, but failed to find where in the paper this procedure suggested. Can anybody clarify this issue? I mean that procedure is reasonable, but I am not sure about reference?

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