Orbital signals in carbon isotopes: phase distortion as a signature of the carbon cycle
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00480226" target="_blank" >RIV/67985530:_____/17:00480226 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/2017PA003143" target="_blank" >http://dx.doi.org/10.1002/2017PA003143</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2017PA003143" target="_blank" >10.1002/2017PA003143</a>
Alternative languages
Result language
angličtina
Original language name
Orbital signals in carbon isotopes: phase distortion as a signature of the carbon cycle
Original language description
Isotopic mass balance models are employed here to study the response of carbon isotope composition (delta C-13) 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 (similar to 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 delta C-13 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 delta C-13 response can help to reduce uncertainties in astrochronological age models that are tuned to the 405 kyr cycle.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA17-10982S" target="_blank" >GA17-10982S: Sea-level change and global carbon cycle in greenhouse climate: trans-Atlantic correlation of Turonian (mid-Cretaceous) sedimentary archives</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Paleoceanography
ISSN
0883-8305
e-ISSN
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Volume of the periodical
32
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
1236-1255
UT code for WoS article
000418169800010
EID of the result in the Scopus database
2-s2.0-85034262786