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Sun-climate relationships studied in tree rings in Chile

Grant number: 01/01569-0
Support type:Regular Research Grants
Duration: May 01, 2001 - April 30, 2002
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geophysics
Principal Investigator:Daniel Jean Roger Nordemann
Grantee:Daniel Jean Roger Nordemann
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). São José dos Campos , SP, Brazil


This work aims to clarify the relationships that exist between the variation in sun luminosity associated with solar activity and environmental and climatic phenomena recorded in the variations of the thickness of the growth rings of trees. The scale of time chosen covers the last two millennia and the samples of trees used to obtain the temporal series of thickness of their rings are cypresses originating in Chile, given the fact that we can find in them series covering the desired interval of time. Thus, we will study the temporal series of the thickness of growth rings of trees sensitive to environmental parameters, such as temperatures and pluviometry, among others, and of pertinent observational data, such as the number of sunspots. The study comprises the mathematical analysis of the temporal series, searching for characteristic periodicities of geophysical and/or climatic phenomena. The methodology used includes spectral analysis through the methods of maximum entropy and iterative regression and principally through the method of wavelets. The study will be concentrated geographically on the records and observational data from Chile. (AU)