Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17...85h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Jan. 1990, p. 85-88.
Physics
9
Abundance, Carbon 14, Geomagnetism, Solar Cycles, Solar Terrestrial Interactions, Atmospheric Composition, Least Squares Method, Paleoclimatology, Periodic Variations, Solar Magnetic Field
Scientific paper
Records of time variations in the atmospheric C-14 production rate for the past 7200 years were analyzed after removing the 11,000-year geomagnetic contribution. It was found that residual variations exhibit a 2200-2600 year quasi-periodicity, which consists of both a long-term variation of the mean and a superposed recurring pattern of century-scale variations; the strongest of the century-scale variations occur near successive maxima of the 2400 year cycles. The recurrence of large amplitude C-14 variations at 2400 year intervals is most directly explained as due to solar forcing at both the about 2400 year and the century-scale periods. The existence of a 2400 year solar quasi-cycle has implications for the predictability of future pronounced solar activity minima and for the interpretation of certain minor Holocene climatic variations.
Hood Lon L.
Jirikowic J. L.
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