Rapid Progression of Ocean Acidification in the California Current System

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Science  13 Jul 2012:
Vol. 337, Issue 6091, pp. 220-223
DOI: 10.1126/science.1216773

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  1. Fig. 1

    Temporal evolution of ocean acidification in the California CS from 1750 until 2050 for the A2 scenario. (A to C) Maps illustrating the evolution of annual mean surface pH, showing the decrease in pH for 1750, 2005, and 2050. (D to F) Offshore depth sections depicting the general decrease of the annual mean saturation state of seawater with regard to aragonite (Ωarag) and the shoaling of the saturation depth (i.e., Ωarag = 1) for the same three years. The white lines in (A) to (C) indicate the position of the offshore section.

  2. Fig. 2

    Temporal evolution of the volume of seawater with a particular Ωarag in the nearshore 10 km of the central California CS for the A2 scenario. The panels depict the evolution (A) in the upper 60 m, (B) in between 60 and 120 m, and (C) in the bottom layer of the model above the shelf sediments (maximum depth: 120 m). Volumes were computed by summing over all regions from Point Conception (34°35′N) to the California/Oregon border (42°0′N).

  3. Fig. 3

    Temporal evolution of the mean saturation states with regard to aragonite (left y axis) and calcite (right y axis) in the nearshore 10 km of the central California CS as a function of the atmospheric Pco2 (lower x axis) and time (upper x axis). The evolutions of three depth layers (0 to 60 m, 60 to 120 m, and the bottom layer of the model above the shelf sediments) are shown. Also shown are the mean evolutions of Ωarag for the tropical ocean, the Southern Ocean, and the Arctic Ocean, as simulated by a global coarse resolution model (18). Shaded curves depict the modeled trajectories including ±1 SD of the seasonal variations. All simulations were performed for the A2 scenario.