Variability and trends of ocean acidification in the Southern California Current System

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Author(s) Leinweber, A., Gruber N.
Publication Type Journal Items, Publication Status: Published
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Title Variability and trends of ocean acidification in the Southern California Current System
Subtitle A time series from Santa Monica Bay
Author(s) Leinweber, A.
Gruber N.
Journal or Series Title Journal of geophysical research. C, Oceans
Volume Number 118
Issue Number 7
Start Page 3622-3633
ISSN 2169-9275 0148-0227
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2013
Keyword(s) Ocean acidification
Coastal site
Southern California Current System
Abstract [1] We investigate the temporal variability and trends of pH and of the aragonite saturation state, Ωarag, in the southern California Current System on the basis of a 6 year time series from Santa Monica Bay, using biweekly observations of dissolved inorganic carbon and combined calculated and measured alkalinity. Median values of pH and Ωarag in the upper 20 m are comparable to observations from the subtropical gyres, but the temporal variability is at least a factor of 5 larger, primarily driven by short-term upwelling events and mesoscale processes. Ωarag and pH decrease rapidly with depth, such that the saturation horizon is reached already at 130 m, on average, but it occasionally shoals to as low as 30 m. No statistically significant linear trends emerge in the upper 100 m, but Ωarag and pH decrease, on average, at rates of −0.009±0.006 yr−1 and −0.004±0.003 yr−1 in the 100–250 m depth range. These are somewhat larger, but not statistically different from the expected trends based on the recent increase in atmospheric CO2. About half of the variability in the deseasonalized data can be explained by the El Niño Southern Oscillation, with warm phases (El Niño) being associated with above normal pH and Ωarag. The observed variability and trend in Ωarag and pH is well captured by a multiple linear regression model on the basis of a small number of readily observable independent variables. This permits the estimation of these variables for related sites in the region.
DOI 10.1002/jgrc.20259
Additional Notes Received 7 December 2012, Revised 28 May 2013, Accepted 28 May 2013, Published 30 July 2013
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 004289352
Source Database ID SCOPUS-84885156590
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  author = "Leinweber, A. and Gruber N.",
  title = "{V}ariability and trends of ocean acidification in the {S}outhern {C}alifornia {C}urrent {S}ystem: {A} time series from {S}anta {M}onica {B}ay",
  journal = "Journal of geophysical research. C, Oceans",
  year = 2013,
  volume = "118",
  number = "7",
  pages = "3622-3633--",

E-Citations record created: Tue, 12 Nov 2013, 11:05:46 CET