The role of calcification in carbonate compensation

  title={The role of calcification in carbonate compensation},
  author={Bernard P. Boudreau and Jack J. Middelburg and Yiming Luo},
  journal={Nature Geoscience},
The long-term recovery of the oceans from present and past acidification is possible due to neutralization by the dissolution of biogenic CaCO3 in bottom sediments, that is, carbonate compensation. However, such chemical compensation is unable to account for all features of past acidification events, such as the enhanced accumulation of CaCO3 at deeper depths after acidification. This overdeepening of CaCO3 accumulation led to the idea that an increased supply of alkalinity to the oceans, via… 

Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2

The globally averaged calcite compensation depth has deepened by several hundred metres in the past 15 Myr. This deepening has previously been interpreted to reflect increased alkalinity supply to

Ocean Alkalinity, Buffering and Biogeochemical Processes

It is shown that it is important to distinguish between measurable titration alkalinity and charge balance alkalination that is used to quantify calcification and carbonate dissolution and needed to understand the impact of biogeochemical processes on components of the carbon dioxide system.

Influences of iron and manganese cycling on alkalinity in the redox stratified water column of Chesapeake Bay

. The coastal alkalinity cycle controls the global burial of carbonate which modulates the ability of the ocean to trap anthropogenic CO 2 . Twelve high vertical resolution profiles from the

Assessing the response of coccolithophores and foraminifera to enhanced ocean alkalinity as a CO2 sequestration technique

The alkalinity of seawater sets the overall capacity of the ocean to hold carbon dioxide in dissolved forms. Variations in past alkalinity, related to changing weathering or carbonate compensation,

Reduced CaCO3 Flux to the Seafloor and Weaker Bottom Current Speeds Curtail Benthic CaCO3 Dissolution Over the 21st Century

Results from a range of Earth System and climate models of various resolution run under high‐CO2 emission scenarios challenge the paradigm that seafloor CaCO3 dissolution will grow in extent and

Aragonite dissolution protects calcite at the seafloor

In the open ocean, calcium carbonates are mainly found in two mineral forms. Calcite, the least soluble, is widespread at the seafloor, while aragonite, the more soluble, is rarely preserved in

Calcium isotope evidence for environmental variability before and across the Cretaceous-Paleogene mass extinction

Carbon dioxide release during Deccan Traps volcanism and the Chicxulub impact likely contributed to the Cretaceous-Paleogene (K-Pg) mass extinction; however, the intensity and duration of CO2 input

Middle to Late Eocene Changes of the Ocean Carbonate Cycle

Sedimentary records show that calcium carbonate (CaCO3) preservation fluctuated during the Eocene. These fluctuations are well documented for the equatorial Pacific. However, data from other basins



Ongoing transients in carbonate compensation

Uptake of anthropogenic CO2 is acidifying the oceans. Over the next 2000 years, this will modify the dissolution and preservation of sedimentary carbonate. By coupling new formulas for the positions

Modeling the dissolution of settling CaCO3 in the ocean

The production, transport, and dissolution of carbonate shells plays an important role in the global carbon cycle. For instance, these processes affect the ocean's CO32− concentration, which, on

Aftermath of the end‐Cretaceous mass extinction: Possible biogeochemical stabilization of the carbon cycle and climate

In the aftermath of the Cretaceous/Tertiary (K/T) boundary event (∼65 m.y. ago), pelagic carbonate productivity was greatly reduced for several hundred thousand years. A decrease in carbonate

Reduced calcification of marine plankton in response to increased atmospheric CO2

It is suggested that the progressive increase in atmospheric CO2 concentrations may slow down the production of calcium carbonate in the surface ocean, as the process of calcification releases CO2 to the atmosphere.

Assessing the potential long-term increase of oceanic fossil fuel CO 2 uptake due to CO 2 -calcification feedback

It is predicted that a substantial reduction in marine carbonate production is possible in the future, with enhanced ocean CO2 sequestration across the model ensemble driving a 4–13% reduction in the year 3000 atmospheric fossil fuel CO2 burden.

Marine calcifiers exhibit mixed responses to CO2-induced ocean acidification

The results suggest that the impact of elevated atmospheric p CO2 on marine calcification is more varied than previously thought.

Solution of shallow-water carbonates: An insignificant buffer against rising atmospheric CO2

Model predictions suggest that the saturation state of surface ocean waters with respect to carbonate minerals will decline during the twenty-first century owing to increased invasion of atmospheric

Size-dependent response of foraminiferal calcification to seawater carbonate chemistry

Abstract. The response of the marine carbon cycle to changes in atmospheric CO2 concentrations will be determined, in part, by the relative response of calcifying and non-calcifying organisms to

A Cenozoic record of the equatorial Pacific carbonate compensation depth

A carbonate accumulation record that covers the past 53 million years from a depth transect in the equatorial Pacific Ocean is presented and large superimposed fluctuations in carbonate compensation depth are found during the middle and late Eocene.