Carbonate system data on the Molokai reef flat ...

• Main Authors: Yates, Kimberly Kaye, Halley, Roberet B
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Field experiment; Mesocosm or benthocosm; North Pacific; Rocky-shore community; Tropical; Water sample; Oceanography; FOS Earth and related environmental sciences; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.743388; https://doi.pangaea.de/10.1594/PANGAEA.743388

The severity of the impact of elevated atmospheric pCO2 to coral reef ecosystems depends, in part, on how seawater pCO2 affects the balance between calcification and dissolution of carbonate sediments. Presently, there are insufficient published data that relate concentrations of pCO2 and CO3**2- to in situ rates of reef calcification in natural settings to accurately predict the impact of elevated atmospheric pCO2 on calcification and dissolution processes. Rates of net calcification and dissolution, CO3**2- concentrations, and pCO2 were measured, in situ, on patch reefs, bare sand, and coral rubble on the Molokai reef flat in Hawaii. Rates of calcification ranged from 0.03 to 2.30 mmol CaCO3/m**2/h and dissolution ranged from -0.05 to -3.3 mmol CaCO3/m**2/h. Calcification and dissolution varied diurnally with net calcification primarily occurring during the day and net dissolution occurring at night. These data were used to calculate threshold values for pCO2 and CO3**2- at which rates of calcification and ... : Supplement to: Yates, Kimberly Kaye; Halley, Roberet B (2006): CO3**2- concentration and pCO2 thresholds for calcification and dissolution on the Molokai reef flat, Hawaii. Biogeosciences, 3, 357-369 ...