Chronology and Eccentricity Phasing for the Early Turonian Greenhouse (∼93–94 Ma): Constraints on Astronomical Control of the Carbon Cycle

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000098" target="_blank" >RIV/00025798:_____/21:00000098 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985530:_____/21:00543114 RIV/67985831:_____/21:00543114

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/toc/25724525/current" target="_blank" >https://agupubs.onlinelibrary.wiley.com/toc/25724525/current</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2020PA004188" target="_blank" >10.1029/2020PA004188</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chronology and Eccentricity Phasing for the Early Turonian Greenhouse (∼93–94 Ma): Constraints on Astronomical Control of the Carbon Cycle

Popis výsledku v původním jazyce

The Early Turonian interval represents a unique confluence of climatic and oceanographic conditions including peak surface temperatures, high greenhouse-gas concentrations, and maximum Phanerozoic sea level. The susceptibility of this climate mode to astronomical insolation forcing remains poorly understood partly due to a limited time control and unknown phasing of astronomical cycles in this interval. Here, we offer a refined astrochronology of the Early Turonian based on laterally consistentprecession signals preserved in offshore strata of the Bohemian Cretaceous Basin (central Europe).Pristine amplitude modulation verified through interference patterns in depth-frequency plots provides a robust indication of ∼100 and 405-kyr eccentricity phases (maxima and minima) that are pinned to ammonite biozones and new carbon-isotope data from two cores. The Early Turonian is estimated as 885 ± 41 (2sigma) thousand years (kyr) in duration, with the Cenomanian/Turonian boundary predating the first Turonian 405-kyr maximum (no. 232 in the Geological Time Scale 2020) by 82 ± 70 (2sigma) kyr. The results support a possible link of the recovery from Oceanic Anoxic Event II to increasing magnitude of seasonal insolation extremes due to rising eccentricity on 405-kyr and million-year (Myr) time scales. Superimposed upon this trend are small-scale carbon-isotope anomalies the pacing of which passes from ∼110 kyr, resembling short eccentricity, to ∼170 kyr, possibly related to obliquity modulation.This eccentricity-to-obliquity transition, paralleling the rising phase of Myr-scale eccentricity, suggests decoupling of the carbon-cycle perturbations from low-latitude seasonal insolation. Mid-latitude to highlatitude carbon reservoirs became involved toward the Middle Turonian.

Název v anglickém jazyce

Chronology and Eccentricity Phasing for the Early Turonian Greenhouse (∼93–94 Ma): Constraints on Astronomical Control of the Carbon Cycle

Popis výsledku anglicky

The Early Turonian interval represents a unique confluence of climatic and oceanographic conditions including peak surface temperatures, high greenhouse-gas concentrations, and maximum Phanerozoic sea level. The susceptibility of this climate mode to astronomical insolation forcing remains poorly understood partly due to a limited time control and unknown phasing of astronomical cycles in this interval. Here, we offer a refined astrochronology of the Early Turonian based on laterally consistentprecession signals preserved in offshore strata of the Bohemian Cretaceous Basin (central Europe).Pristine amplitude modulation verified through interference patterns in depth-frequency plots provides a robust indication of ∼100 and 405-kyr eccentricity phases (maxima and minima) that are pinned to ammonite biozones and new carbon-isotope data from two cores. The Early Turonian is estimated as 885 ± 41 (2sigma) thousand years (kyr) in duration, with the Cenomanian/Turonian boundary predating the first Turonian 405-kyr maximum (no. 232 in the Geological Time Scale 2020) by 82 ± 70 (2sigma) kyr. The results support a possible link of the recovery from Oceanic Anoxic Event II to increasing magnitude of seasonal insolation extremes due to rising eccentricity on 405-kyr and million-year (Myr) time scales. Superimposed upon this trend are small-scale carbon-isotope anomalies the pacing of which passes from ∼110 kyr, resembling short eccentricity, to ∼170 kyr, possibly related to obliquity modulation.This eccentricity-to-obliquity transition, paralleling the rising phase of Myr-scale eccentricity, suggests decoupling of the carbon-cycle perturbations from low-latitude seasonal insolation. Mid-latitude to highlatitude carbon reservoirs became involved toward the Middle Turonian.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA17-10982S" target="_blank" >GA17-10982S: Globální cyklus uhlíku a změny hladiny oceánu ve skleníkovém klimatu: trans-atlantická korelace sedimentárních archivů turonu (křída)</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Paleoceanography and Paleoclimatology

ISSN

2572-4517

e-ISSN

2572-4525

Svazek periodika

36

Číslo periodika v rámci svazku

4 : e2020PA004188

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

19

Strana od-do

nestránkováno

Kód UT WoS článku

000644566400019

EID výsledku v databázi Scopus

2-s2.0-85104934266