The CaCO sub 3 profile in a recent Ionian Sea core and the tree ring radiocarbon record over the last two millennia

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL017i010p01545· OSTI ID:5980777

Cini Castagnoli, G; Bonino, G; Caprioglio, F; Serio, M; Provenzale, A ^[1]; Bhandar, N ^[2]

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1. Istituto di Cosmogeofisica del C.N.R., Torino (Italy) Istituto di Fisica Generale dell'Universita', Torino (Italy)
2. Physical Research Laboratory, Ahmedabad (India)

The calcium carbonate (CaCO{sub 3}) profile of a recent sediment core, drilled in the Ionian Sea in 1979, is studied. The CaCO{sub 3} content of the sediment has been measured at regularly spaced intervals of {Delta}d=0.25 cm corresponding to {Delta}t=3.87 yr from AD 170 to the present. The CaCO{sub 3} 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 CaCO{sub 3} time series reveals the presence of the well known periodicity with period ca: 200 years, characteristic of the {Delta}{sup 14}C record. Since the CaCO{sub 3} 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 {approx}200 yr {Delta}{sup 14}C 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.

• OSTI ID: 5980777
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:10; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

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