Calculations of Earth's radiation during the Neopleistocene have been performed with high spatial-temporal resolution. Based on the analysis of calculated insolation, statistical characteristics of changes in annual and seasonal radiation intensity at the upper boundary of the atmosphere for 5-degree latitude zones in the Antarctic region during the Neopleistocene have been obtained. A correlation analysis of radiation intensity and astronomical characteristics, which determine insolation variations, was conducted. No correlation was found between the intensity of annual and seasonal radiation in the 5-degree latitude zones and the eccentricity of Earth's orbit. A noticeable positive correlation of summer radiation intensity with changes in axial tilt and a negative correlation with the dynamics of perihelion longitude were observed. The correlation of winter intensity with axial tilt showed a significant negative relationship, while with perihelion longitude, a significant positive relationship was found. The maximum range of fluctuations in winter radiation intensity in Antarctica at latitude during the Neopleistocene significantly increased (by 9.305 W/m), while the maximum range of fluctuations in summer radiation intensity at latitude decreased (by 4.3 W/m). The correlation coefficient of summer radiation intensity and perihelion longitude in the Neopleistocene decreases in magnitude with latitude, while it increases with axial tilt. The correlation coefficient of winter radiation intensity and axial tilt decreases in magnitude with latitude and increases with perihelion longitude. The maximum range of changes in annual and seasonal radiation intensity in the 5-degree latitude zones exceeded the maximum variations of the 18O indicator from isotopic oxygen analysis of air bubbles in the ice core from Vostok station by 1-2 orders of magnitude during the Neopleistocene. The extremely weak response of the 18O indicator to variations in the main incoming energy signal demonstrates the unjustified use of its values for solving problems of geochronology and climate stratigraphy of the Neopleistocene.
Fedorov et al. (Sun,) studied this question.