A Jurassic record encodes an analogous Dansgaard–Oeschger climate periodicity

Abstract

Earth’s past climate exhibits short-term (1500-year) pronounced fluctuations during the last glacial period, called Dansgaard–Oeschger (DO) glacial events, which have never been detected in pre-Quaternary times. The record of DO equivalent climate variability in Mesozoic strata can provide constraints on understanding these events. Here we highlight a prominent 1500-year cyclicity in a Jurassic (~ 155 Ma) ice-free sedimentary record from the Tethyan Basin. This Jurassic 1500-year cyclicity is encoded in high-resolution magnetic susceptibility (MS) proxy data reflecting detrital variations, and expressed as marl-limestone couplets. Additionally, MS data detect the modulation of these DO-scale couplets by supercouplet sets, reflecting the precession and its harmonics. We suggest that this Jurassic DO-like cyclicity may originate from paleo-monsoon-like system, analogous to the record of DO events in the Pleistocene East Asian monsoon archives. Paleogeographic reconstructions and atmosphere–ocean simulations further support the potential existence of strong, ancient monsoon circulations in the Tethyan Basin during the Jurassic.

Decadal–centennial-scale solar-linked climate variations and millennial-scale internal oscillations during the Early Cretaceous

“…5 C,D, Fig. S14 C,D; see also AM analysis for ~ 1.5-kyr filtering of DO events by previous studies 22 , 66 – 68 ). Furthermore, AM of DO-like ~ 1.5-kyr periodicities modulated by half-precession, precession, and short eccentricity cycles are also observed in the low-latitude marine record of the Late Jurassic 22 .…”

“…S14 C,D; see also AM analysis for ~ 1.5-kyr filtering of DO events by previous studies 22 , 66 – 68 ). Furthermore, AM of DO-like ~ 1.5-kyr periodicities modulated by half-precession, precession, and short eccentricity cycles are also observed in the low-latitude marine record of the Late Jurassic 22 . These lines of evidence suggest that AM of ~ 1.5-kyr periodicities induced by the Milankovitch cycle band have occurred in several epochs, both during the ‘icehouse’ and ‘greenhouse’ periods.…”

“…( D ) 1.5-kyr filtering (frequency: 6.7e-4; bandwidth: 4.0e-5) of GL T _syn_high, AM envelopes (2.5-kyr sliding windows) of 1.5-kyr filtering, and obliquity and precession cycles for last 400 kyrs. Note that abrupt millennial-scale oscillations in both Cretaceous lacustrine Ca/Ti ratio and Greenland temperature variability show distinct AM by the obliquity and eccentricity cycle band (see also Boulila et al 22 for AM of DO-scale variability of half-precession and precession cycle bands during the last glacial and the Late Jurassic periods). …”

“…Given the presence of half-precession signal in the DO record 69 and in their potential analogues in the Jurassic 22 , there is debate on the potential low-latitude climate forcing of the ~ 1.5-kyr cycle. The half-precession and precession signals are also observed in late Pleistocene millennial-scale variability records of the African monsoon 69 and Asian monsoon 70 regions, although some inconsistencies exist 71 .…”

Use of remote-sensing to quantify the distribution of progradation/erosion along a forced-regressive modern coastline: driving factors and impact on the stratigraphic record

“…Annual to multi-decadal events and cycles (e.g. the El Niño-Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), the Atlantic Multi-decadal Oscillation (AMO), Dansgaard-Oeschger (DO), or DO-like events (see Boulila et al, 2022) likely contribute to such gaps, owing to: (i) the complex nature of these cycles (both for cause(s) and consequences); (ii) the along-strike variability of coastal dynamics; (iii) the highly-variable preservation potential of sediments; and (iv) the increasing loss of time resolution and calibration with age. Detailed studies of modern analogue coastal sedimentary systems that examine these processes can be used to inform longer-term analyses for a range of end-users (e.g.…”