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1. Combined Effects of Gametogenic Calcification and Dissolution on δ18O Measurements of the Planktic Foraminifer Trilobatus sacculifer

   https://doi.org/10.1029/2018GC007908  

   Wycech, Jody B. ; Kelly, Daniel Clay ; Kitajima, Kouki ; Kozdon, Reinhard ; Orland, Ian J. ; Valley, John W. ( November 2018 , Geochemistry, Geophysics, Geosystems)
2. Emergent properties of branching morphologies modulate the sensitivity of coral calcification to high P CO2

   https://doi.org/10.1242/jeb.217000  

   Edmunds, Peter J. ; Burgess, Scott C. ( April 2020 , The Journal of Experimental Biology)
3. Daily variation in net primary production and net calcification in coral reef communities exposed to elevated <i>p</i>CO₂

   https://doi.org/10.5194/bg-14-3549-2017  

   Comeau, Steeve ; Edmunds, Peter J. ; Lantz, Coulson A. ; Carpenter, Robert C. ( January 2017 , Biogeosciences)

   The threat represented by ocean acidification (OA) for coral reefs has received considerable attention because of the sensitivity of calcifiers to changing seawater carbonate chemistry. However, most studies have focused on the organismic response of calcification to OA, and only a few have addressed community-level effects, or investigated parameters other than calcification, such as photosynthesis. Light (photosynthetically active radiation, PAR) is a driver of biological processes on coral reefs, and the possibility that these processes might be perturbed by OA has important implications for community function. Here we investigate how CO₂ enrichment affects the relationships between PAR and community net O₂ production (P_net), and between PAR and community net calcification (G_net), using experiments on three coral communities constructed to match (i) the back reef of Mo'orea, French Polynesia, (ii) the fore reef of Mo'orea, and (iii) the back reef of O'ahu, Hawaii. The results were used to test the hypothesis that OA affects the relationship between P_net and G_net. For the three communities tested, pCO₂ did not affect the P_net–PAR relationship, but it affected the intercept of the hyperbolic tangent curve fitting the G_net–PAR relationship for both reef communities in Mo'orea (but not in O'ahu). For the three communities, the slopes of the linear relationships between P_net and G_net were not affected by OA, although the intercepts were depressed by the inhibitory effect of high pCO₂ on G_net. Our result indicates that OA can modify the balance between net calcification and net photosynthesis of reef communities by depressing community calcification, but without affecting community photosynthesis. 

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4. Increased Biogenic Calcification and Burial Under Elevated p CO 2 During the Miocene: A Model‐Data Comparison

   https://doi.org/10.1029/2022GB007541  

   Si, Weimin ; Herbert, Timothy ; Wu, Mengxi ; Rosenthal, Yair ( May 2023 , Global Biogeochemical Cycles)

   Ocean acidification due to anthropogenic CO₂emission reduces ocean pH and carbonate saturation, with the projection that marine calcifiers and associated ecosystems will be negatively affected in the future. On longer time scale, however, recent studies of deep‐sea carbonate sediments suggest significantly increased carbonate production and burial in the open ocean during the warm Middle Miocene. Here, we present new model simulations in comparison to published Miocene carbonate accumulation rates to show that global biogenic carbonate production in the pelagic environment was approximately doubled relative to present‐day values when elevated atmosphericpCO₂led to substantial global warming ∼13–15 million years ago. Our analysis also finds that although high carbonate production was associated with high dissolution in the deep‐sea, net pelagic carbonate burial was approximately 30%–45% higher than modern. At the steady state of the long‐term carbon cycle, this requires an equivalent increase in riverine carbonate alkalinity influx during the Middle Miocene, attributable to enhanced chemical weathering under a warmer climate. Elevated biogenic carbonate production resulted in a Miocene ocean that had carbon (dissolved inorganic carbon) and alkalinity (total alkalinity) inventories similar to modern values but was poorly buffered and less saturated in both the surface and the deep ocean relative to modern.

    

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5. Exposure to CO 2 influences metabolism, calcification and gene expression of the thecosome pteropod Limacina retroversa

   https://doi.org/10.1242/jeb.164400  

   Maas, Amy E. ; Lawson, Gareth L. ; Bergan, Alexander J. ; Tarrant, Ann M. ( February 2018 , The Journal of Experimental Biology)