Dating climatic episodes of the holocene
Spectral analysis indicates high frequency climate variation on centennial-millennial time scale during the Holocene.
This further reflects Holocene climate instability and the existence of centennial-millenium scale rhythm in mid latitude areas as well.
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It appears clear that changes in Earth's orbit have operated slowly over thousands and millions of years to change the amount of solar radiation reaching each latitudinal band of Earth during each month.
These orbital changes can be easily calculated and predict that the Northern Hemisphere should have been warmer than today during the mid-Holocene in the summer and colder in the winter.
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This week our blog is on the evolution of climate during the Holocene episode in Pennsylvania.
What is most remarkable about the mid-Holocene is that we now have a good understanding of both the global patterns of temperature change during that period and what caused them.
Bottom panels are corresponding surface temperature anomalies simulated by the Paleoclimate Modelling Intercomparison Project Phase 2 and 3 (PMIP2 and PMIP3).
Graphic from the Intergovernmental Panel on Climate Change Fifth Assessment Report.
Some 3700 C dates associated with 155 cultural continua of the world were collectively analyzed to identify worldwide synchroneities in appearance and termination of the cultures.
Significant globally synchronous discontinuities were identified in each independent analysis.