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      Planetary chaos and inverted climate phasing in the Late Triassic of Greenland


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          Our study of climate response to orbital variations in a Late Triassic midlatitude temperate setting in Jameson Land, East Greenland, provides robust evidence of astronomically forced grand cycles ascribed to gravitational interactions between Earth and Mars and is an Early Mesozoic record where both Mars–Earth modulation components are present and constrained with adequate chronostratigraphic controls. These findings suggest chaotic behavior of the inner Solar System and have implications as reference points in calculations of the past motions of the planets in the Solar System. Furthermore, our findings demonstrate a climate antiphasing between low and midlatitudes, which has implications for precise correlation of geological records and for validating models of Earth’s climate dynamics.


          Sedimentological records provide the only accessible archive for unraveling Earth’s orbital variations in the remote geological past. These variations modulate Earth’s climate system and provide essential constraints on gravitational parameters used in solar system modeling. However, geologic documentation of midlatitude response to orbital climate forcing remains poorly resolved compared to that of the low-latitude tropics, especially before 50 Mya, the limit of reliable extrapolation from the present. Here, we compare the climate response to orbital variations in a Late Triassic midlatitude temperate setting in Jameson Land, East Greenland (∼43°N paleolatitude) and the tropical low paleolatitude setting of the Newark Basin, with independent time horizons provided by common magnetostratigraphic boundaries whose timing has been corroborated by uranium-lead (U-Pb) zircon dating in correlative strata on the Colorado Plateau. An integrated cyclostratigraphic and magnetostratigraphic age model revealed long-term climate cycles with periods of 850,000 and 1,700,000 y ascribed to the Mars–Earth grand orbital cycles. This indicates a 2:1 resonance between modulation of orbital obliquity and eccentricity variations more than 200 Mya and whose periodicities are inconsistent with astronomical solutions and indicate chaotic diffusion of the solar system. Our findings also demonstrate antiphasing in climate response between low and midlatitudes that has implications for precise global correlation of geological records.

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          A Practical Guide to Wavelet Analysis

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            An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

            Much of our understanding of Earth’s past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states—Hothouse, Warmhouse, Coolhouse, Icehouse—are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
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              The heartbeat of the Oligocene climate system.

              A 13-million-year continuous record of Oligocene climate from the equatorial Pacific reveals a pronounced "heartbeat" in the global carbon cycle and periodicity of glaciations. This heartbeat consists of 405,000-, 127,000-, and 96,000-year eccentricity cycles and 1.2-million-year obliquity cycles in periodically recurring glacial and carbon cycle events. That climate system response to intricate orbital variations suggests a fundamental interaction of the carbon cycle, solar forcing, and glacial events. Box modeling shows that the interaction of the carbon cycle and solar forcing modulates deep ocean acidity as well as the production and burial of global biomass. The pronounced 405,000-year eccentricity cycle is amplified by the long residence time of carbon in the oceans.

                Author and article information

                Proc Natl Acad Sci U S A
                Proc Natl Acad Sci U S A
                Proceedings of the National Academy of Sciences of the United States of America
                National Academy of Sciences
                22 April 2022
                26 April 2022
                22 October 2022
                : 119
                : 17
                : e2118696119
                [1] aDepartment of Geosciences and Natural Resource Management, University of Copenhagen , Copenhagen K DK-1350, Denmark;
                [2] bLamont–Doherty Earth Observatory, Columbia University , Palisades, NY 10968;
                [3] cEarth and Planetary Sciences, Rutgers University , Piscataway, NJ 08854
                Author notes
                1To whom correspondence may be addressed. Email: dvk@ 123456ldeo.columbia.edu or larsc@ 123456ign.ku.dk .

                Edited by Jean Jouzel, Laboratoire des Sciences du Climat et de L'Environ, Orme des Merisiers, France; received October 13, 2021; accepted March 12, 2022

                Author contributions: M.M. and L.B.C. designed research; M.M., D.V.K., and L.B.C. performed research; M.M. and D.V.K. analyzed data; and M.M., D.V.K., and L.B.C. wrote the paper.

                Author information
                Copyright © 2022 the Author(s). Published by PNAS.

                This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

                : 12 March 2022
                Page count
                Pages: 7
                Physical Sciences
                Earth, Atmospheric, and Planetary Sciences

                cyclostratigraphy,milankovitch,lacustrine,fleming fjord group


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