Milankovic’s theory: multidimensional visualisation of the change of insolation and indicators of climatic change from 100000 before present to 100000 after present (in intervals of 1,000 years)

Abstract

The deviation of the insolation on the earth’s surface from the past to the present and the present to the future for cloudless days is calculated in intervals of 1,000 years from 100000 years before present (BP) to 100000 years after present (AP), its basis being Milankovic’s theory. But the result are not the well-known Milankovic-curves, which are calculated for different latitudes and in which the x-axis represents years and the y-axis represents the insolation difference to present during the North-summer half-year. The calculations are made for each day of the selected years from the South Pole to the North Pole. Thus, two temporal dimensions are represented, that of a year and that of a day, furthermore the spatial dimension “latitude” and the dimension “energy” (insolation deviation). The performance of modern PCs allows the results of the calculations to be presented by a graphical animation. A determined deviation pattern of the insolation is obtained for each year. δ18O data, the mean global temperature and the additional ice volume on the continents are added to the graphic representations of those patterns for the period from 100000 years BP to the present. During that period insolation deviation patterns can be recognised which correlate with cool climates or climates getting cooler, and others which correlate with relatively warm climates or climates getting warmer. Correlations between the patterns are calculated and groups of similar patterns can be composed which can be associated in most cases with specific climatic conditions or specific climatic change. Comparison of patterns between 100000 years and present BP with patterns between present and 100000 years AP can help to estimate climatic change during the 100000 years ahead.

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Correspondence to Ulrich Wieczorek.

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Wieczorek, U. Milankovic’s theory: multidimensional visualisation of the change of insolation and indicators of climatic change from 100000 before present to 100000 after present (in intervals of 1,000 years). Int J Earth Sci (Geol Rundsch) 99, 201–205 (2010). https://doi.org/10.1007/s00531-008-0377-1

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Keywords

  • Milankovic theory
  • Visualisation
  • Insolation patterns
  • Climatic change
  • Ice age