Long-period astronomically-forced terrestrial carbon sinks

Valero, Luis; Cabrera, Lluı́s; Sáez, Alberto; Garcés, Miguel

doi:10.1016/j.epsl.2016.03.038

Cited by 21 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3) the periods from 1 to 5 Myr could be altered by the stacking process of the data. Data from single sites document with high fidelity some of these periods 20–32 . In contrast, longer periods (>5 Myr) are notably preserved in the compiled δ 18 O data.…”

Section: Resultsmentioning

confidence: 98%

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Boulila

2019

Sci Rep

View full text Add to dashboard Cite

Geological sediment archives document a rich periodic series of astronomically driven climate, but record also abrupt, severe climatic changes called events, the multi-Myr boundary conditions of which have generally been ascribed to acyclic processes from Earth’s interior dynamics. These events have rarely been considered together within extended time series for potential correlation with long-term (multi-million year, Myr) cycling. Here I show a coupling between events and multi-Myr cycles in a temperature and ice-volume climatic proxy of the geological past 115 Myr. I use Cenozoic through middle Cretaceous climatic variations, as recorded in benthic foraminifera δ18O, to highlight prominent ~9 and ~36 Myr cyclicities. These cyclicities were previously attributed either to astronomical or tectonic variations. In particular, I point out that most of the well-known events during the past 115 Myr geological interval occur during extremes in the ~9 and ~36 Myr cycling. One exception is the early Cenozoic hyperthermal events including the salient Paleocene-Eocene Thermal Maximum (~56 Ma), which do not match extremes in long-period cyclicities, but to inflection point of these cycles. Specific focus on climatic events, as inferred from δ18O proxy, suggest that some “events”, marked by gradual trends within the ~9 and ~36 Myr cycle extremes, would principally be paced by long-term cycling, while “events”, recorded as abrupt δ18O changes nearby cycle extremes, would be rather induced by acyclic processes. The connection between cyclic and acyclic processes, as triggers or feedbacks, is very likely. Such link between cycling and events in Earth’s past climate provides insight into celestial dynamics governing perturbations in Earth’s surface systems, but also the potential connection between external and Earth’s interior processes.

show abstract

Section: Resultsmentioning

confidence: 98%

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Boulila

2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Hay & Leslie, ; Wagreich et al, ; Wendler & Wendler, ) and/or terrestrial carbon burial (cf. Valero et al, ). The detailed structure of groundwater fluctuations on eccentricity time scales and the δ 13 C 0 response are, however, unknown.…”

Section: Discussion: Practical Implications and Case Examplesmentioning

confidence: 99%

“…Other potential mechanisms, which are not necessarily linked to the monsoonal variability, include variations in shallow‐water carbonate production (cf. Weissert et al, ), storage of organic carbon in terrestrial reservoirs (Valero et al, ; Zachos et al, ), or changes in the stability of methane clathrates in intermediate depths of the ocean floor or in high‐latitude permafrost (e.g., DeConto et al, ; Dickens, ; Lunt et al, ). Interplay of low‐latitude coccolitophore production and high‐latitude diatom production, controlled by changes in the lengths of the seasons, was proposed by Rickaby et al ().…”

Section: Introductionmentioning

confidence: 99%

Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

2017

View full text Add to dashboard Cite

Isotopic mass balance models are employed here to study the response of carbon isotope composition (δ13C) of the ocean‐atmosphere system to amplitude‐modulated perturbations on Milankovitch time scales. We identify a systematic phase distortion, which is inherent to a leakage of power from the carrier precessional signal to the modulating eccentricity terms in the global carbon cycle. The origin is partly analogous to the simple cumulative effect in sinusoidal signals, reflecting the residence time of carbon in the ocean‐atmosphere reservoir. The details of origin and practical implications are, however, different. In amplitude‐modulated signals, the deformation is manifested as a lag of the 405 kyr eccentricity cycle behind amplitude modulation (AM) of the short (~100 kyr) eccentricity cycle. Importantly, the phase of AM remains stable during the carbon cycle transfer, thus providing a reference framework against which to evaluate distortion of the 405 kyr term. The phase relationships can help to (1) identify depositional and diagenetic signatures in δ13C and (2) interpret the pathways of astronomical signal through the climate system. The approach is illustrated by case studies of Albian and Oligocene records using a new computational tool EPNOSE (Evaluation of Phase in uNcertain and nOisy SEries). Analogous phase distortions occur in other components of the carbon cycle including atmospheric CO2 levels; hence, to fully understand the causal relationships on astronomical time scales, paleoclimate models may need to incorporate realistic, amplitude‐modulated insolation instead of monochromatic sinusoidal approximations. Finally, detection of the lagged δ13C response can help to reduce uncertainties in astrochronological age models that are tuned to the 405 kyr cycle.

show abstract

“…al., 2014) and sediment supply (Valero et al, 2016) in continental environments in the Oligocene and…”

Section: Interpretation Of Geochemical Patterns In the Most Basinmentioning

confidence: 99%

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Grygar

Mach²,

Schnabl

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

We describe orbital forcing in siliciclastic lacustrine sediments, deposited in central Europe (ca. 50.5 °N and 13.5 °E, the Most Basin, the Czech Republic) between ~17.7 and ~15.9 Ma, i.e., before the Miocene climatic optimum (MCO) and in its early stage. Chemical element analysis combined with magneto-and cyclostratigraphy produced a consistent stratigraphy for the studied basin fill. The palaeoenvironmental record is mainly based on variations of the chemical weathering intensity in the lake catchment (normalised potassium concentration K/Al or K/Ti). The Most Basin sedimentary profile is specific by relatively high deposition rates (typically 20 cm/kyr, sampling density corresponded to temporal resolution of 1-2 kyr) and sensitivity to a regional continental climate. For age control, we used the ATNTS2012 for younger sediments and an alternative age of the onset of C5Dn chron and the end of C5Dr.1r short chron. In the earliest studied interval, the chemical weathering intensity in the catchment was controlled by precession, while between 17.5 and 17.15 Ma, short eccentricity was mainly driving chemical weathering intensity. After 17.05 Ma, i.e., just before the onset of the MCO, and in the period of persistent high eccentricity between 16.95 and 16.7 Ma, chemical weathering intensity reached its precession-controlled maxima. In the subsequent period of the persistent low eccentricity at 16.65 Ma, the orbital signal nearly vanished in the Most Basin. Abrupt but temporary environmental change occurred in the interval between 16.5 and 16.35 Ma (polarity chron C5Cn.2n), within two cycles of high eccentricity. Its trigger is uncertain but it might have been local or regional. The obtained composite record was compared with marine δ 13 C and δ 18 O data, showing certain global control of the Most Basin deposits. The Most Basin record thus shows

show abstract

Long-period astronomically-forced terrestrial carbon sinks

Cited by 21 publications

References 32 publications

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Contact Info

Product

Resources

About

Long-period astronomically-forced terrestrial carbon sinks

Cited by 21 publications

References 32 publications

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Coupling between Grand cycles and Events in Earth’s climate during the past 115 million years

Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Contact Info

Product

Resources

About

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum