PMEL Publications Abstract

FY 2012

Changes in South Pacific anthropogenic carbon

Waters, J.F., F.J. Millero, and C.L. Sabine

Global Biogeochem. Cycles, 25(4), GB4011, doi: 10.1029/2010GB003988 (2011)

The changes in anthropogenic CO₂ are evaluated in the South Pacific, along the meridional line P18 (110°W) and the zonal line P06 (32°S), using the extended multiple linear regression (eMLR) method. The structure of the column inventory of anthropogenic CO₂ on P18 is similar to the southern section of P16 [Sabine et al., 2008] in the central South Pacific (150°W), but the overall increase is greater by approximately 5-10 µmol kg^-1. The value of the anthropogenic CO₂ inventory on P18 is in agreement at the crossover point of an earlier evaluation of P06 [Murata et al., 2008]. Subsequent changes in pH are also evaluated. The changes in pH is determined from the changes in anthropogenic CO₂ and do not reflect variability in other decadal signals. For both cruise tracks, the average annual change in pH is -0.0016 mol kg^-1 yr^-1. This value is in good agreement with the average decrease in pH in the North Pacific [Byrne et al., 2010], at the Hawaii Times Series and the subtropical North Atlantic [Gonzalez-Davila et al., 2007]. There is evidence for greater uptake of anthropogenic CO₂ in the western South Pacific due to the formation and subduction of Subtropical Mode Water.

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