Rapid progression of ocean acidification in the California Current System.
Nearshore waters of the California Current System (California CS) already have a low carbonate saturation state, making them particularly susceptible to ocean acidification. We used eddy-resolving model simulations to study the potential development of ocean acidification in this system up to the year 2050 under the Special Report on Emissions Scenarios A2 and B1 scenarios. In both scenarios, the saturation state of aragonite Ω(arag) is projected to drop rapidly, with much of the nearshore region developing summer-long undersaturation in the top 60 meters within the next 30 years. By 2050, waters with Ω(arag) above 1.5 will have largely disappeared, and more than half of the waters will be undersaturated year-round. Habitats along the sea floor will become exposed to year-round undersaturation within the next 20 to 30 years. These projected events have potentially major implications for the rich and diverse ecosystem that characterizes the California CS.
Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, Switzerland. nicolas.gruber@env.ethz.ch
Nicolas
N
Gruber
Claudine
C
Hauri
Zouhair
Z
Lachkar
Damian
D
Loher
Thomas L
TL
Frölicher
Gian-Kasper
GK
Plattner
D059001:Aquatic Organisms; D001272:Atmosphere; D002119:Calcium Carbonate / Q000032:analysis*; D002140:California; D002245:Carbon Dioxide / Q000032:analysis; D003198:Computer Simulation; D017753:Ecosystem; D005544:Forecasting; D019015:Geologic Sediments / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D010140:Pacific Ocean; D012623:Seawater / Q000737:chemistry*; D014872:Water Movements
D002245:Carbon Dioxide; D002119:Calcium Carbonate