Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2752d&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2752
Physics
Scientific paper
Cosmogenic isotopes 14C and 10Be, generated by cosmic rays in the Earth's atmosphere are present in natural archives. These isotopes carry the information about long-term variability of solar activity and the changes of the Earth magnetic field. The isotope records can be compared with the evidence for climate change over long time intervals and thus the understanding of the mechanisms forcing climate change can be improved. A high degree of climate variability is reflected in high-resolution ice core records from Greenland. Main attention was paid to the sequence of climatic events during the past 38 thousand years, because there is the high-precision record of cosmic rays (14C and 10Be content), geomagnetic field (record of the Earth's dipole moment), climate fluctuations (oxygen-18 record during both the Holocene and stadial and interstadial climate states of the last ice age). Spectral analysis of all data was carried out and the mutual correlation function of data under study was examined. In cosmogenic isotope data the main harmonic is ~2400 years, whereas, as shown by spectral analysis of oxygen-18 data in Greenland ice cores, the power density of the ~1500-year harmonic dominates over the ~2400-year harmonics. The periodicities of, and variations in amplitudes of maxima and minima of data often show 1400 to 1600-year cycles in ice core proxy data. Comparison of the beryllium-10 and oxygen-18 records in Greenland ice cores and records of the Earth's dipole moment for the stadial and interstadial climate states (the past 11-40 thousand years) was made. Oxygen-18 changes are coherent with the fluctuations of the 10Be record. Remarkably, these series are coherent not only in phase but also in amplitude, providing what is probably the best evidence to date for the definite cosmic-ray-sun-climate relationship. Thus, we show that galactic cosmic ray flux coming into the Earth's atmosphere and modulated by both the heliomagnetic and geomagnetic activity, is the important factor forcing changes in weather and climate. Probably the cosmic rays are part of a unique mechanism due to which it is possible to explain changes of climate observed on different time scales, and this mechanism integrates a series of different physical processes on the Sun, in near-earth space and on Earth. This work was supported by INTAS, Grant 97-31008 and Netherlands Organisation for Scientific Research (NWO) - project 047.009.005.
Dergachev Valentin A.
Dmitriev P. B.
Morner Nils-Axel
Raspopov Oleg M.
van Geel B.
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