Carbonate Dissolution Fluctuations in the Western Equatorial Pacific During the Late Quaternary

Planktonic foraminiferal test fragmentation in three cores along a depth transect from the western equatorial Pacific (ERDC-93P, 1619 m; RC17-177, 2600 m; V28-238, 3120 m [Thompson, 1976]) were examined for the last 500 kyr at sample intervals from 2.5 to 5 kyr to study the fluctuations of dissolution in the western equatorial Pacific. The age models were constructed by correlating the δ18O records with the SPECMAP stack [Imbrie et al., 1984]. Results showed that intermediate and deep waters experienced the same patterns of dissolution through climatic cycles. Fragmentation varied with a greater amplitude, and the carbonate ion concentration changed less, in the deep than in the intermediate water. Dissolution has significant variance distributions and coherencies with δ18O over the 100, 41, and 23 kyr periods of orbital variations; dissolution maxima lag ice volume minima by 6 to 20 kyr. The dissolution variability was consistent with recent geochemical models which seek to explain the reduction of atmospheric CO2 concentration at the last glacial maximum [Broecker, 1982; Boyle, 1988].

[1]  Michael P. Bacon,et al.  Thorium 230 profiling in deep‐sea sediments: High‐resolution records of flux and dissolution of carbonate in the equatorial Atlantic during the last 24,000 years , 1990 .

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

[3]  E. Boyle.  The role of vertical chemical fractionation in controlling late Quaternary atmospheric carbon dioxide , 1988 .

[4]  R. Keir,et al.  On the Late Pleistocene ocean geochemistry and circulation , 1988 .

[5]  H. Oeschger,et al.  CO2 record in the Byrd ice core 50,000–5,000 years bp , 1988, Nature.

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

[7]  L. Peterson,et al.  Carbonate Preservation and Rates of Climatic Change: An 800 KYR Record from the Indian Ocean , 2013 .

[8]  Edward A. Boyle,et al.  Comparison of Atlantic and Pacific paleochemical records for the last 215,000 years : changes in deep ocean circulation and chemical inventories , 1985 .

[9]  L. Peterson,et al.  Carbonate dissolution in Recent sediments of the eastern equatorial Indian Ocean: Preservation patterns and carbonate loss above the lysocline , 1985 .

[10]  R. Keir,et al.  Atmospheric CO2 content in the last 120,000 years: The Phosphate‐Extraction Model , 1983 .

[11]  W. Berger,et al.  Dissolution of foraminifera in the eastern equatorial Pacific; an in situ experiment , 1982 .

[12]  H. Oeschger,et al.  Ice core sample measurements give atmospheric CO2 content during the past 40,000 yr , 1982, Nature.

[13]  W. Broecker.  Glacial to interglacial changes in ocean chemistry , 1982 .

[14]  H. BergerW,et al.  深海底の有孔虫 リソクラインと溶解速度 | 文献情報 | J-GLOBAL 科学技術総合リンクセンター , 1982 .

[15]  R. Keir,et al.  Calcite Dissolution: An in situ Study in the Panama Basin. , 1981, Science.

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

[17]  N. Shackleton.  Carbon-13 in Uvigerina: Tropical Rainforest History and the Equatorial Pacific Carbonate Dissolution Cycles , 1977 .

[18]  N. Pisias,et al.  Climate Changes and Lags in Pacific Carbonate Preservation, Sea Surface Temperature and Global Ice Volume , 1977 .

[19]  R. Thunell.  Optimum indices of calcium carbonate dissolution, in deep-sea sediments , 1976 .

[20]  P. Thompson.  Planktonic foraminiferal dissolution and the progress towards a Pleistocene equatorial Pacific transfer function , 1976 .

[21]  N. Opdyke,et al.  Oxygen-Isotope and Paleomagnetic Stratigraphy of Pacific Core V28-239 Late Pliocene to Latest Pleistocene , 1976 .

[22]  N. Shackleton,et al.  Distribution, stratigraphic position and age of ash layer , 1975 .

[23]  P. Thompson,et al.  Pacific Pleistocene Sediments: Planktonic Foraminifera Dissolution Cycles and Geochronology , 1974 .

[24]  J. Edmond.  On the dissolution of carbonate and silicate in the deep ocean , 1974 .

[25]  W. Berger.  Deep-sea carbonates; Pleistocene dissolution cycles , 1973 .

[26]  Nicholas J Shackleton,et al.  Oxygen Isotope and Palaeomagnetic Stratigraphy of Equatorial Pacific Core V28-238: Oxygen Isotope Temperatures and Ice Volumes on a 105 Year and 106 Year Scale , 1973, Quaternary Research.

[27]  R. Berner,et al.  Dissolution kinetics of calcium carbonate in sea water; I, A kinetic origin for the lysocline , 1972 .

[28]  W. Berger,et al.  PLANKTONIC FORAMINIFERA: DIFFERENTIAL SETTLING, DISSOLUTION, AND REDEPOSITION1 , 1972 .

[29]  Wallace S. Broecker,et al.  A Kinetic Model for the Chemical Composition of Sea Water , 1971, Quaternary Research.

[30]  W. Berger.  Planktonic Foraminifera: Selective solution and the lysocline , 1970 .

[31]  W. Berger.  Planktonic Foraminifera: selective solution and paleoclimatic interpretation , 1968 .

[32]  G. Arrhenius.  Sediment Cores from the East Pacific , 1953 .