Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02

B. R. Carter, R. A. Feely, S. Mecking, J. N. Cross, A. M. Macdonald, S. A. Siedlecki, L. D. Talley, C. L. Sabine, Frank J Millero, J. H. Swift, A. G. Dickson, K. B. Rodgers

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A modified version of the extended multiple linear regression (eMLR) method is used to estimate anthropogenic carbon concentration (Canth) changes along the Pacific P02 and P16 hydrographic sections over the past two decades. P02 is a zonal section crossing the North Pacific at 30°N, and P16 is a meridional section crossing the North and South Pacific at ~150°W. The eMLR modifications allow the uncertainties associated with choices of regression parameters to be both resolved and reduced. Canth is found to have increased throughout the water column from the surface to ~1000 m depth along both lines in both decades. Mean column Canth inventory increased consistently during the earlier (1990s–2000s) and recent (2000s–2010s) decades along P02, at rates of 0.53 ± 0.11 and 0.46 ± 0.11 mol C m−2 a−1, respectively. By contrast, Canth storage accelerated from 0.29 ± 0.10 to 0.45 ± 0.11 mol C m−2 a−1 along P16. Shifts in water mass distributions are ruled out as a potential cause of this increase, which is instead attributed to recent increases in the ventilation of the South Pacific Subtropical Cell. Decadal changes along P16 are extrapolated across the gyre to estimate a Pacific Basin average storage between 60°S and 60°N of 6.1 ± 1.5 PgC decade−1 in the earlier decade and 8.8 ± 2.2 PgC decade−1 in the recent decade. This storage estimate is large despite the shallow Pacific Canth penetration due to the large volume of the Pacific Ocean. By 2014, Canth storage had changed Pacific surface seawater pH by −0.08 to −0.14 and aragonite saturation state by −0.57 to −0.82.

Original languageEnglish (US)
Pages (from-to)306-327
Number of pages22
JournalGlobal Biogeochemical Cycles
Volume31
Issue number2
DOIs
StatePublished - Feb 1 2017

Fingerprint

Acidification
global ocean
Linear regression
carbon sequestration
Ships
Carbon
Water
Calcium Carbonate
Seawater
Ventilation
aragonite
gyre
water mass
ventilation
penetration
water column
saturation
seawater
ship
ocean acidification

Keywords

  • anthropogenic carbon
  • decadal variability
  • eMLR
  • ocean acidification
  • P02 and P16
  • repeat hydrography

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Environmental Science(all)
  • Atmospheric Science

Cite this

Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02. / Carter, B. R.; Feely, R. A.; Mecking, S.; Cross, J. N.; Macdonald, A. M.; Siedlecki, S. A.; Talley, L. D.; Sabine, C. L.; Millero, Frank J; Swift, J. H.; Dickson, A. G.; Rodgers, K. B.

In: Global Biogeochemical Cycles, Vol. 31, No. 2, 01.02.2017, p. 306-327.

Research output: Contribution to journalArticle

Carter, BR, Feely, RA, Mecking, S, Cross, JN, Macdonald, AM, Siedlecki, SA, Talley, LD, Sabine, CL, Millero, FJ, Swift, JH, Dickson, AG & Rodgers, KB 2017, 'Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02', Global Biogeochemical Cycles, vol. 31, no. 2, pp. 306-327. https://doi.org/10.1002/2016GB005485
Carter, B. R. ; Feely, R. A. ; Mecking, S. ; Cross, J. N. ; Macdonald, A. M. ; Siedlecki, S. A. ; Talley, L. D. ; Sabine, C. L. ; Millero, Frank J ; Swift, J. H. ; Dickson, A. G. ; Rodgers, K. B. / Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02. In: Global Biogeochemical Cycles. 2017 ; Vol. 31, No. 2. pp. 306-327.
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