Footnote ap

^apSee Bulsiewicz et al. 1998; Kieke et al. 2007.

Bulsiewicz, K., H. Rose, O. Klatt, A. Putzka and W. Roether. 1998. A capillary-column chromatographic system for efficient chlorofluorocarbon measurements in ocean waters. J. Geophys. Res. 103:15959-15970.

Kieke, D., M. Rhein, L. Stramma, W. M. Smethie, J. L. Bullister, and D. A. LeBel. 2007. Changes in the pool of Labrador Sea Water in the subpolar North Atlantic. Geophys. Res. Lett. 34, L06605, doi:10.1029/2006GL028959.