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      Impact of 10-Myr scale monsoon dynamics on Mesozoic climate and ecosystems

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          Abstract

          Earth’s orbital variations on timescales of 10 4–10 5 years, known as Milankovitch cycles, have played a critical role in pacing climate change and ecosystem dynamics, through glacial and/or monsoon dynamics. However, the climatic and biotic consequences of these cycles on much longer (~ 10 7 years) timescales remain unclear, due to a lack of long proxy records with precise age constraints. Here, we show ~ 10-Myr scale variations in early Mesozoic (250–180 Ma) records of lake-level, desert distribution, biogenic-silica burial flux, atmospheric CO 2 levels ( pCO 2), and sea-surface-temperature (SST). Their phase relationships, coupled with carbon cycle modeling results, suggest that orbitally-paced summer monsoon dynamics modulates changes in terrestrial weatherability by ~ 20%, affecting changes in pCO 2 of up to 500–1,000 ppmv and 3–7 °C SST. We also infer that these ~ 10-Myr scale climatic variations could have been causally linked to biotic turnover, size variations in dinosaur footprints, and tetrapod dispersal, potentially through spatio-temporal variations in resource availability and arid-hot climatic barriers at low-middle latitudes.

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          A Practical Guide to Wavelet Analysis

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            Effects of climate on chemical_ weathering in watersheds

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              La2010: a new orbital solution for the long-term motion of the Earth

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                Author and article information

                Contributors
                ikeda.masayuki@eps.s.u-tokyo.ac.jp
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                23 July 2020
                23 July 2020
                2020
                : 10
                : 11984
                Affiliations
                [1 ]ISNI 0000 0001 0656 4913, GRID grid.263536.7, Department of Geosciences, Graduate School of Science, , Shizuoka University, ; Shizuoka, 790-8577 Japan
                [2 ]ISNI 0000 0001 2151 536X, GRID grid.26999.3d, Department of Earth and Planetary Science, , University of Tokyo, ; Bunkyo, 113-0033 Japan
                [3 ]ISNI 0000 0000 9290 9879, GRID grid.265050.4, Department of Environmental Science, , Toho University, ; Chiba, 274-8510 Japan
                Article
                68542
                10.1038/s41598-020-68542-w
                7378230
                32704030
                4aea8adc-f8ff-4506-bb1c-a23420c6596c
                © The Author(s) 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 11 April 2019
                : 15 June 2020
                Funding
                Funded by: MEXT | Japan Society for the Promotion of Science (JSPS)
                Award ID: 18K13647
                Award Recipient :
                Categories
                Article
                Custom metadata
                © The Author(s) 2020

                Uncategorized
                carbon cycle,element cycles,stratigraphy,palaeontology
                Uncategorized
                carbon cycle, element cycles, stratigraphy, palaeontology

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