• Medientyp: E-Artikel
  • Titel: Impact of 10-Myr scale monsoon dynamics on Mesozoic climate and ecosystems
  • Beteiligte: Ikeda, Masayuki; Ozaki, Kazumi; Legrand, Julien
  • Erschienen: Springer Science and Business Media LLC, 2020
  • Erschienen in: Scientific Reports, 10 (2020) 1
  • Sprache: Englisch
  • DOI: 10.1038/s41598-020-68542-w
  • ISSN: 2045-2322
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: AbstractEarth’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.
  • Zugangsstatus: Freier Zugang