Araucaria growth response to solar and climate variability in South Brazil
In this work, the Sun–Earth–climate relationship is studied using tree growth rings of <i>Araucaria angustifolia</i> (Bertol.) O. Kuntze collected in the city of Passo Fundo, located in the state of Rio Grande do Sul (RS), Brazil. These samples were previously studied by Rigozo et al....
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-05-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/36/717/2018/angeo-36-717-2018.pdf |
| Summary: | In this work, the Sun–Earth–climate relationship is studied using tree
growth rings of <i>Araucaria angustifolia</i> (Bertol.) O. Kuntze collected
in the city of Passo Fundo, located in the state of Rio Grande do Sul (RS),
Brazil. These samples were previously studied by Rigozo et al. (2008);
however, their main interest was to search for the solar periodicities in the
tree-ring width mean time series without interpreting the rest of the
periodicities found. The question arises as to what are the drivers related
to those periodicities. For this reason, the classical method of spectral
analysis by iterative regression and wavelet methods are applied to find
periodicities and trends present in each tree-ring growth, in Southern
Oscillation Index (SOI), and in annual mean temperature anomaly between the
24 and 44° S. In order to address the aforementioned question, this
paper discusses the correlation between the growth rate of the tree rings
with temperature and SOI. In each tree-ring growth series, periods between 2
and 7 years were found, possibly related to the El Niño/La Niña
phenomena, and a ∼ 23-year period was found, which may be related to
temperature variation. These novel results might represent the tree-ring
growth response to local climate conditions during its lifetime, and to
nonlinear coupling between the Sun and the local climate variability
responsible to the regional climate variations. |
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| ISSN: | 0992-7689 1432-0576 |