Identification of solar periodicities in southern African baobab δ13C record-Reference-Cited by-同舟云学术

Identification of solar periodicities in southern African baobab δ13C record

Published:2020-07-29 Issue:7/8 Volume:116 Page:
ISSN:1996-7489
Container-title:South African Journal of Science
language:en
Short-container-title:S. Afr. J. Sci

Author:

Kotze Pieter B.¹²³^ORCID

Affiliation:

1. South African National Space Agency, Space Science, Hermanus, South Africa

2. Centre for Space Research, North-West University, Potchefstroom, South Africa

3. Physics Department, Stellenbosch University, Stellenbosch, South Africa

Abstract

Spectral analysis using wavelet, Lomb–Scargle and maximum entropy techniques of the proxy rainfall record of northeastern South Africa based on annual carbon isotope (δ13C) data obtained from baobab trees for the period 1600 AD – 2000 AD show clear evidence of the presence of characteristic solar periodicities. Solar periodicities that were identified above the 95% confidence level include the ~11-year Schwabe cycle, the ~22-year Hale cycle as well as the 80–110-year Gleissberg cycle. A Morlet wavelet analysis of the δ13C data between 1600 AD and 1700 AD shows the effect of the Maunder sunspot minimum on both the Schwabe and Hale cycles during this time.

Publisher

Academy of Science of South Africa

Subject

General Earth and Planetary Sciences,General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

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