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标题：Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment
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作者：Kay Vopel ; Alexis Marshall ; Shelly Brandt 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2021
卷号：11
DOI：10.1038/s41598-021-02314-y
语种：English
出版社：Springer Nature
摘要：Ecosystem feedbacks in response to ocean acidification can amplify or diminish diel pH oscillations in productive coastal waters. Benthic microalgae generate such oscillations in sediment porewater and here we ask how CO 2 enrichment (acidification) of the overlying seawater alters these in the absence and presence of biogenic calcite. We placed a 1-mm layer of ground oyster shells, mimicking the arrival of dead calcifying biota (+Calcite), or sand (Control) onto intact silt sediment cores, and then gradually increased the pCO 2 in the seawater above half of +Calcite and Control cores from 472 to 1216 μatm (pH 8.0 to 7.6, CO 2:HCO 3 − from 4.8 to 9.6 × 10 −4). Porewater [O 2