An atlas of the distribution of calcium carbonate in sediments of the deep sea

Historical observations of the concentration of calcium carbonate in global deep sea sediments are compiled and compared with a new gridded field of seawater CO3= concentration to reveal regional variations in the calcite lysocline. The most obvious mode of variability of the calcite lysocline is the thickness of the lysocline (defined here as the difference in overlying water carbonate saturation, ΔCO3=, between high and low calcite sediments) with a thicker lysocline in the Atlantic than in the Pacific. I attribute this variation to differences in the delivery rate of terriginous material. A recent model for the lower glacial atmospheric pCO2 proposed to change the relationship between the depth of the lysocline and the ΔCO3= of the water column by changing the rain rate ratio of organic carbon to calcite production (the “rain ratio model”: Archer and Maier-Reimer, 1994). I search the data set for analogs to the proposed glacial world, by looking for a link between the regional climate at the sea surface and the depth of the lysocline below. The ΔCO3= at the carbonate compensation depth (CCD) in the tropics appears to be 10–20 μmol kg−1 ΔCO3= more undersaturated than in high latitudes, but this is smaller than the ∼40 μmol kg−1 shift required by the model. In addition, the general resemblance of the glacial lysocline to the present day requires that the proposed shift in ΔCO3= at the CCD be globally uniform rather than locally variable, as climate forcing would probably generate. I conclude that the rain ratio model would probably require some globally uniform perturbation during glacial time, such as a change in ocean Si content, if it is to explain the entire pCO2 decrease observed in the glacial atmosphere. Finally, I grid the sedimentary data to estimate that the inventory CaCO3 which is available to neutralize fossil fuel CO2 is approximately 1600 Gt carbon, a quantity which may be exceeded by fossil fuel release in the next several centuries.

[1]  D. Archer,et al.  Respiration and dissolution in the sediments of the western North Atlantic: estimates from models of in situ microelectrode measurements of porewater oxygen and pH , 1994 .

[2]  S. Levitus,et al.  Distribution of nitrate, phosphate and silicate in the world oceans , 1993 .

[3]  M. Bender,et al.  Carbon fluxes at the sediment-water interface of the deep-sea: calcium carbonate preservation. , 1981 .

[4]  D. Cwienk.  Recent and Glacial Age Organic Carbon and Biogenic Silica Accumulation in Marine Sediments , 1986 .

[5]  G. Arrhenius.  Rate of production, dissolution and accumulation of biogenic solids in the ocean. , 1988, Global and planetary change.

[6]  Wallace S. Broecker,et al.  Neutralization of Fossil Fuel CO2 by Marine Calcium Carbonate , 1977 .

[7]  R. Keir.  Reconstructing the ocean carbon system variation during the last 150,000 years according to the Antarctic nutrient hypothesis , 1990 .

[8]  C. Culberson,et al.  MEASUREMENT OF THE APPARENT DISSOCIATION CONSTANTS OF CARBONIC ACID IN SEAWATER AT ATMOSPHERIC PRESSURE1 , 1973 .

[9]  J. C. Walker,et al.  Return of the coral reef hypothesis: basin to shelf partitioning of CaCO3 and its effect on atmospheric CO2. , 1992, Geology.

[10]  E. Maier‐Reimer,et al.  Geochemical cycles in an Ocean General Circulation Model , 1993 .

[11]  D. Archer,et al.  Glacial carbonate dissolution cycles and atmospheric pCO2: A view from the ocean bottom , 1992 .

[12]  P. deMenocal,et al.  INFLUENCES OF HIGH- AND LOW-LATITUDE PROCESSES ON AFRICAN TERRESTRIAL CLIMATE:PLEISTOCENE EOLIAN RECORDS , 1993 .

[13]  A. Bé,et al.  Calcium carbonate distribution in the surface sediments of the Indian Ocean , 1976 .

[14]  S. Noriki,et al.  Particulate fluxes of carbonate and organic carbon in the ocean. Is the marine biological activity working as a sink of the atmospheric carbon , 1991 .

[15]  David Archer,et al.  Modeling the calcite lysocline , 1991 .

[16]  W. Broecker,et al.  Carbon cycle and atmospheric CO/sub 2/: natural variations archean to present; proceedings of the Chapman Conference on Natural Variations in Carbon Dioxide and the Carbon Cycle, Tarpon Springs, FL, January 9-13, 1984 , 1985 .

[17]  E. Boyle.  Vertical oceanic nutrient fractionation and glacial/interglacial CO2 cycles , 1988, Nature.

[18]  M. Lyle.  Climatically forced organic carbon burial in equatorial Atlantic and Pacific Oceans , 1988, Nature.

[19]  W. Prell,et al.  Climatic change and CaCO3 preservation: An 800,000 year bathymetric Reconstruction from the central equatorial Pacific Ocean , 1989 .

[20]  E. Maier‐Reimer,et al.  Effect of deep-sea sedimentary calcite preservation on atmospheric CO2 concentration , 1994, Nature.

[21]  C. Culberson,et al.  EFFECT OF PRESSURE ON CARBONIC ACID, BORIC ACID, AND THE pH IN SEAWATER1 , 1968 .

[22]  W. Broecker,et al.  The role of CaCO3 compensation in the glacial to interglacial atmospheric CO2 change , 1987 .

[23]  R. Jahnke,et al.  Fine scale distributions of porosity and particulate excess210Pb, organic carbon and CaCO3 in surface sediments of the deep equatorial Pacific , 1986 .

[24]  B. Hicks,et al.  The atmospheric input of trace species to the world ocean , 1991 .

[25]  D. M. Nelson,et al.  The Silica Balance in the World Ocean: A Reestimate , 1995, Science.

[26]  P. Brewer,et al.  Chemical fluxes from a sediment trap experiment in the deep Sargasso Sea , 1978 .

[27]  A. Mix.  Influence of productivity variations on long-term atmospheric CO2 , 1989, Nature.

[28]  D. Archer.  Equatorial Pacific Calcite Preservation Cycles: Production or Dissolution? , 1991 .

[29]  D. Archer,et al.  Dissolution of calcite in deep-sea sediments: pH and O2 microelectrode results , 1989 .

[30]  S. Chillrud,et al.  River Fluxes of Dissolved Silica to the Ocean Were Higher during Glacials: Ge/Si In Diatoms, Rivers, and Oceans , 1992 .

[31]  W. Broecker,et al.  Evidence for a higher pH in the glacial ocean from boron isotopes in foraminifera , 1995, Nature.

[32]  W. Berger,et al.  Distribution of carbonate in surface sediments of the Pacific Ocean , 1976 .

[33]  K. Turekian,et al.  Distribution of calcium carbonate in surface sediments of the Atlantic Ocean , 1976 .

[34]  W. Berger.  Deglacial CO2 buildup: Constraints on the coral-reef model , 1982 .

[35]  F. Millero,et al.  A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media , 1987 .

[36]  F. Sayles,et al.  The solubility of CaCO3 in seawater at 2°C based upon in-situ sampled pore water composition☆ , 1980 .

[37]  D. Archer,et al.  Calcium carbonate preservation in the ocean , 1990, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[38]  W. Balsam,et al.  Atlantic sediments: Glacial/interglacial comparisons , 1987 .