Scanning X-ray fluorometry (XRF) data from the continuous composite XRF splice of the EW0408-33JC core set are compared against the net primary productivity (NPP) model results described in Equations 1 and 2 of Addison et al. (2013, doi:10.1002/jgrc.20243). The NPP model was derived using a multiple step-wise linear regression method applied to instrument data of sea level pressures described by the North Pacific Index, surface air temperatures recorded at Sitka, Alaska, and North Pacific Ocean sea surface temperatures (see Addison et al. (2013, doi:10.1002/jgrc.20243) for further details and citations). The NPP model output is presented annually from CE 1922-2010, and as a 5-point multi-pass smoothing average. The scanning XRF data is reported over the same time range as annual Z-scores calculated from the linearly detrended centered log ratio Br / centered log ratio Cl, and as a 10-yr multi-pass smoothing average.