The CaCO3 profile in a recent Ionian Sea core and the tree ring radiocarbon record over the last two millennia

Details The CaCO3 profile in a recent Ionian Sea core and the tree ring radiocarbon record over the last two millennia The CaCO3 profile in a recent Ionian Sea core and the tree ring radiocarbon record over the last two millennia

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1545c&link_type=abstract

Geophysical Research Letters, Volume 17, Issue 10, p. 1545-1548

Mathematics

Logic

5

Geochemistry: Geochronology, Mineralogy And Petrology: Sedimentary Petrology, Information Related To Geographic Region: Large Bodies Of Water (E.G., Lakes And Inland Seas)

Scientific paper

The calcium carbonate (CaCO3) profile of a recent sediment core, drilled in the Ionian Sea in 1979, is studied. The CaCO3 content of the sediment has been measured at regularly spaced intervals of Δd=0.25 cm corresponding to Δt=3.87 yr from AD 170 to the present. The CaCO3 profile of the core closely resembles the radiocarbon time series as deduced from tree ring data. The two records have a correlation coefficient of about 0.8 and show strikingly similar long-term variations. This result presumably follows from the fact that both systems take part in the carbon cycle. The spectral analysis of the CaCO3 time series reveals the presence of the well known periodicity with period ca: 200 years, characteristic of the Δ14C record. Since the CaCO3 content of sea sediments is governed by biological, physical and chemical processes in surface sea waters, which in turn are strongly influenced by climatic conditions, and since the ~200 yr Δ14C wave is known to be governed by solar modulation of galactic cosmic rays, the tuning of these two records on the same frequencies suggests a strong Sun-climate relationship.

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