Abstract：
:Earth's orbital variations on timescales of 104-105 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 (~ 107 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 CO2 levels (pCO2), 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 pCO2 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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ikeda M,Ozaki K,Legrand Jdoi
10.1038/s41598-020-68542-wsubject
Has Abstractpub_date
2020-07-23 00:00:00pages
11984issue
1issn
2045-2322pii
10.1038/s41598-020-68542-wjournal_volume
10pub_type
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