Sedimentary noise and sea levels linked to land–ocean water exchange and obliquity forcing

Mingsong Li (), Linda A. Hinnov, Chunju Huang () and James G. Ogg
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Mingsong Li: China University of Geosciences
Linda A. Hinnov: China University of Geosciences
Chunju Huang: China University of Geosciences
James G. Ogg: China University of Geosciences

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract In ancient hothouses lacking ice sheets, the origins of large, million-year (myr)-scale sea-level oscillations remain a mystery, challenging current models of sea-level change. To address this mystery, we develop a sedimentary noise model for sea-level changes that simultaneously estimates geologic time and sea level from astronomically forced marginal marine stratigraphy. The noise model involves two complementary approaches: dynamic noise after orbital tuning (DYNOT) and lag-1 autocorrelation coefficient (ρ1). Noise modeling of Lower Triassic marine slope stratigraphy in South China reveal evidence for global sea-level variations in the Early Triassic hothouse that are anti-phased with continental water storage variations in the Germanic Basin. This supports the hypothesis that long-period (1-2 myr) astronomically forced water mass exchange between land and ocean reservoirs is a missing link for reconciling geological records and models for sea-level change during non-glacial periods.

Date: 2018
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DOI: 10.1038/s41467-018-03454-y

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