Spatiotemporal variability and long-term trends of ocean acidification in the California Current System

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Author(s) Hauri, Claudine, et al., Gruber, Nicolas, Vogt, O., Lachkar, Zouhair, McDonnell, Andrew M.P., Munnich, Matthias, Plattner, Gian-Kasper
Publication Type Journal Items, Publication Status: Published
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Title Spatiotemporal variability and long-term trends of ocean acidification in the California Current System
Author(s) Hauri, Claudine
et al.
Gruber, Nicolas
Vogt, O.
Lachkar, Zouhair
McDonnell, Andrew M.P.
Munnich, Matthias
Plattner, Gian-Kasper
Journal or Series Title Biogeosciences
Volume Number 10
Issue Number 1
Start Page 193
End Page 216
ISSN 1726-4170
1726-4189
Publisher Copernicus
Publication Place Göttingen
Publication Date 2013
Abstract Due to seasonal upwelling, the upper ocean waters of the California Current System (CCS) have a naturally low pH and aragonite saturation state (Omega(arag)), making this region particularly prone to the effects of ocean acidification. Here, we use the Regional Oceanic Modeling System (ROMS) to conduct preindustrial and transient (1995-2050) simulations of ocean biogeochemistry in the CCS. The transient simulations were forced with increasing atmospheric pCO(2) and increasing oceanic dissolved inorganic carbon concentrations at the lateral boundaries, as projected by the NCAR CSM 1.4 model for the IPCC SRES A2 scenario. Our results show a large seasonal variability in pH (range of similar to 0.14) and Omega(arag) (similar to 0.2) for the nearshore areas (50 km from shore). This variability is created by the interplay of physical and biogeochemical processes. Despite this large variability, we find that present-day pH and Omega(arag) have already moved outside of their simulated preindustrial variability envelopes (defined by +/- 1 temporal standard deviation) due to the rapidly increasing concentrations of atmospheric CO2. The nearshore surface pH of the northern and central CCS are simulated to move outside of their present-day variability envelopes by the mid-2040s and late 2030s, respectively. This transition may occur even earlier for nearshore surface Omega(arag), which is projected to depart from its present-day variability envelope by the early- to mid-2030s. The aragonite saturation horizon of the central CCS is projected to shoal into the upper 75m within the next 25 yr, causing near-permanent undersaturation in subsurface waters. Due to the model's overestimation of Omega(arag), this transition may occur even earlier than simulated by the model. Overall, our study shows that the CCS joins the Arctic and Southern oceans as one of only a few known ocean regions presently approaching the dual threshold of widespread and near-permanent undersaturation with respect to aragonite and a departure from its variability envelope. In these regions, organisms may be forced to rapidly adjust to conditions that are both inherently chemically challenging and also substantially different from past conditions.
DOI 10.5194/bg-10-193-2013
Additional Notes Received 6 July 2012, Revised 4 December 2012, Accepted 7 December 2012
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 006289717
Source Database ID WOS-000314173700013
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@article{Hr2013,
  author = "Hauri, Claudine and et al. and Gruber, Nicolas and Vogt, O. and Lachkar, Zouhair and McDonnell, Andrew M.P. and Munnich, Matthias and Plattner, Gian-Kasper",
  title = "{S}patiotemporal variability and long-term trends of ocean acidification in the {C}alifornia {C}urrent {S}ystem",
  journal = "Biogeosciences",
  year = 2013,
  volume = "10",
  number = "1",
  pages = "193--216",
}


E-Citations record created: Mon, 04 Mar 2013, 11:06:54 CET