Aragonite saturation state dynamics in a coastal upwelling zone Public Deposited

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  • Abstract: Coastal upwelling zones may be at enhanced risk from ocean acidification as upwelling brings low aragonite saturation state (Ω[subscript Ar]) waters to the surface that are further suppressed by anthropogenic CO₂. Ω[subscript Ar] was calculated with pH, pCO₂, and salinity-derived alkalinity time series data from autonomous pH and pCO₂ instruments moored on the Oregon shelf and shelf break during different seasons from 2007 to 2011. Surface Ω[subscript Ar] values ranged between 0.66 ± 0.04 and 3.9 ± 0.04 compared to an estimated pre-industrial range of 1.0 ± 0.1 to 4.7 ± 0.1. Upwelling of high-CO₂ water and subsequent removal of CO₂ by phytoplankton imparts a dynamic range to Ω[subscript Ar] from ~1.0 to ~4.0 between spring and autumn. Freshwater input also suppresses saturation states during the spring. Winter Ω[subscript Ar] is less variable than during other seasons and is controlled primarily by mixing of the water column.
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  • Harris, K., DeGrandpre, M., & Hales, B. (2013). Aragonite saturation state dynamics in a coastal upwelling zone. Geophysical Research Letters, 40(11), 2720-2725. doi:10.1002/grl.50460
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