The effect of dividing the seasonal irradiation of the Earth in the Late Pleistocene according to the phases of change in the eccentricity of its orbit

The calculations of the intensity of irradiation of the Earth and hemispheres with high spatial and temporal resolution were performed for the Late Pleistocene. The effect of division of seasonal irradiation of the hemispheres by phases of increasing and decreasing eccentricity of the Earth’s orbit was discovered. The effect is manifested in the fact that the intensity of summer irradiation in the Northern Hemisphere in the phase of increasing eccentricity exceeds the intensity of its irradiation in the phase of decreasing eccentricity. In the winter half-year, the opposite effect is observed in the Northern Hemisphere. In the phase of increasing eccentricity, the intensity of irradiation is inferior to the intensity of irradiation in the phase of decreasing eccentricity. In the Southern Hemisphere, in the winter half-year, a direct effect of seasonal division is observed, in the summer half-year — the opposite. The effect of seasonal division is associated with the fact that the intensity of annual irradiation of the Earth and hemispheres, as well as the amplitude of the intensity of seasonal irradiation, are determined by eccentricity. The effect of seasonal irradiation division explains the mechanism of formation and manifestation of the 100-thousand-year cycle in the change of the natural environment in the Late Pleistocene.