Volume 20, Issue 11/12, 2010
Environmental Ethics: Questions for the Future
Victor Manuel Velazco Herrera, Oscar Sosa Flores
The Trend of the Dansgaard-Oescher Cycle with Solar Activity
The nature of the climatic response to solar variability is assessed over a long-time scale, as in the case of the periodicity of 1500 years (Dansgaard-Oeschger cycle). For this reason it is important to perform an analysis to detect the existence of this periodicity in the Holocene and the possible influence of the sun on this periodicity. For this purpose, the method of Wavelet analysis in time-frequency was used. The information of oxygen isotopes (δ18O) and Berilium-10 (10Be) at the North Pole reveals a periodicity of approximately 1000 years, whereas at the South Pole it shows the existence of a periodicity of about 1500 years. The comparison of the information of δ18O and 10Be suggests a possible solar influence on the appearance of these periodicities. Possibly the current global warming is due to Dansgaard-Oescher cycle and not by anthropogenic effects.