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Descripción

Late Pleistocene signals of calcium carbonate, organic carbon, and opaline silica concentration and accumulation are documented in a series of cores from a zonal/meridional/depth transect in the equatorial Atlantic Ocean to reconstruct the regional sedimentary history. Spectral analysis reveals that maxima and minima in biogenous sedimentation occur with glacial-interglacial cyclicity as a function of both (1) primary production at the sea surface modulated by orbitally forced variation in trade wind zonality and (2) destruction at the seafloor by variation in the chemical character of advected intermediate and deep water from high latitudes modulated by high-latitude ice volume. From these results a pattern emerges in which the relative proportion of signal variance from the productivity signal centered on the precessional (23 kyr) band decreases while that of the destruction signal centered on the obliquity (41 kyr) and eccentricity (100 kyr) periods increases below ~3600-m ocean depth.

Pertenece a

PANGAEA - Publishing Network for Geoscientific & Environmental Data  

Autor(es)

Verardo, David J -  McIntyre, Andrew - 

Id.: 51825944

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  application/zip, 6 datasets - 

Palabras claveAge model -  Age model, SPECMAP chronology, Imbrie et al. (1984) -  Calculated -  Depth -  DEPTH, sediment/rock -  Isotopic event -  Lamont -  Doherty Earth Observatory, Columbia University -  LDEO -  PC -  Piston corer -  RC16 -  66 -  RC24 -  1 -  12 -  16 -  7 -  Robert Conrad -  Sedimentation rate -  Sed rate -  V25 -  56 -  Vema - 

Cobertura:  MEDIAN LATITUDE: -2.188167 * MEDIAN LONGITUDE: -19.838333 * SOUTH-BOUND LATITUDE: -5.038000 * WEST-BOUND LONGITUDE: -36.620000 * NORTH-BOUND LATITUDE: 0.563000 * EAST-BOUND LONGITUDE: -10.190000 * DATE/TIME START: 1968-02-24T00:00:00 * DATE/TIME END: 1983-03-26T00:00:00 - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  application/zip, 6 datasets - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: Verardo, David J; McIntyre, Andrew (1994): Production and destruction: Control of biogenous sedimentation in the tropical Atlantic 0-300,000 years B.P. Paleoceanography, 9(1), 63-86, https://doi.org/10.1029/93PA02901

Fecha de contribución: 29-ago-2017

Contacto:

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