Footnote k

^kFile includes Ba. See Taylor et al. 2003:

Taylor, J.R., K.K. Falkner, U. Schauer and M. Meredith. 2003. Quantitative considerations of dissolved barium as a tracer in the Arctic Ocean. J. Geophysical Research 108(C12):3374, doi:10.1029/2002JC001635.