Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgc21b0160k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #GC21B-0160
Mathematics
Logic
1620 Climate Dynamics (3309), 1650 Solar Variability
Scientific paper
The investigation of climatic changes in the past and their possible reasons is a complicated problem. The content of radio- and stable isotopes measured in dated samples is a well developed and widely recognized tool for studying changes in the Earth's and near-Earth's environments on a long time scale. From the other hand the biological systems themselves can serve as an indicator of changes in natural conditions. One of quantitative parameters characterizing shifts in surrounding nature might be the absolute value of annual tree growth. In the present work the data of tree ring widths taken from the northern part of Russia together with the content of O-18 and Be-10 in Greenland ice are investigated. The most significant periods in tree ring growth correspond to quasi 200 year and century-scale variations - the solar cycles of Suess and Gleissberg. The variations in tree ring as well as the variations of stable isotopes in ice cores suggest the connection between solar and climate variability. In the beginning of 20th century the break in cyclic behavior for some of the considered samples was discovered. The possible impact of Tunguska meteorite as well as changes of global temperature on the tree growth is discussed. The variability in O-18 content and characteristic cycles in Be-10 series will be compared. There is a possibility of solar energetic particles producing during large solar flares to influence the climatic conditions on the Earth. V.D., M.O., and O.R. thank INTAS for partial support.
Dergachev Valentin A.
Kartavykh J. Y.
Ogurtsov M. G.
Raspopov Oleg M.
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