δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend
Abstract The global LR04 δ18O, the tropical ODP Site 846 sea surface temperature (SST), and the global ΔSST stack records were investigated using the advanced method for time-series decomposition singular spectrum analysis to outline the quantitative role of orbital forcings and to investigate the n...
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ftdoajarticles:oai:doaj.org/article:479a1dcb9bdd4cb7bfe11343c9d7bf9f 2023-05-15T16:41:33+02:00 δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend Paolo Viaggi 2018-12-01T00:00:00Z https://doi.org/10.1186/s40645-018-0236-z https://doaj.org/article/479a1dcb9bdd4cb7bfe11343c9d7bf9f EN eng SpringerOpen http://link.springer.com/article/10.1186/s40645-018-0236-z https://doaj.org/toc/2197-4284 doi:10.1186/s40645-018-0236-z 2197-4284 https://doaj.org/article/479a1dcb9bdd4cb7bfe11343c9d7bf9f Progress in Earth and Planetary Science, Vol 5, Iss 1, Pp 1-37 (2018) Singular spectrum analysis Nonlinear Chaotic Damping Paleoclimate Milankovitch Geography. Anthropology. Recreation G Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.1186/s40645-018-0236-z 2022-12-31T12:56:31Z Abstract The global LR04 δ18O, the tropical ODP Site 846 sea surface temperature (SST), and the global ΔSST stack records were investigated using the advanced method for time-series decomposition singular spectrum analysis to outline the quantitative role of orbital forcings and to investigate the nonlinear dynamics of the Pliocene and Pleistocene climate system. For the first time, a detailed quantitative evaluation is provided of the δ18O and SST variance paced by long-period orbital modulation, short eccentricity, obliquity, precession, and half-precession cycles. New insights into the nonlinear dynamic of the orbital components suggest considering astronomical signals as composite feedback lagged responses paced by orbitals and damped (Early Pliocene) or amplified (Mid-Late Pleistocene) in a range of − 100 to + 400% the forcing. The Early Pliocene asymptotic decay of the δ18O and SST response sensitivity up to − 100% observed for the first time in all orbital responses is interpreted as damping effect of a wide global forest cover along with a possible high ocean primary productivity, through the CO2-related negative feedbacks during time of global greenhouse. An anomalous post-Mid-Pleistocene Transition (MPT) sharply declines to near-zero in obliquity response sensitivity observed in both global δ18O and tropical SST, suggesting an attenuation mechanism of the obliquity driving force and a reduction of the related feedback amplification processes. It is hypothesized the post-MPT obliquity damping has contributed to the strengthening of the short eccentricity response by mitigating the obliquity “ice killing”, favoring a long-life ice sheet sensitive to a synergistic ~ 100-kyr amplification of positive feedback processes during the time of a global icy state. The global δ18O, the tropical SST, and the global ΔSST trend components, all explaining ~ 76% of the Plio-Pleistocene variance and significantly modifying the mean climate state, appear to be related to the long-term pCO2 proxies, supposedly controlled ... Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Progress in Earth and Planetary Science 5 1 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Singular spectrum analysis Nonlinear Chaotic Damping Paleoclimate Milankovitch Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
Singular spectrum analysis Nonlinear Chaotic Damping Paleoclimate Milankovitch Geography. Anthropology. Recreation G Geology QE1-996.5 Paolo Viaggi δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
topic_facet |
Singular spectrum analysis Nonlinear Chaotic Damping Paleoclimate Milankovitch Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
Abstract The global LR04 δ18O, the tropical ODP Site 846 sea surface temperature (SST), and the global ΔSST stack records were investigated using the advanced method for time-series decomposition singular spectrum analysis to outline the quantitative role of orbital forcings and to investigate the nonlinear dynamics of the Pliocene and Pleistocene climate system. For the first time, a detailed quantitative evaluation is provided of the δ18O and SST variance paced by long-period orbital modulation, short eccentricity, obliquity, precession, and half-precession cycles. New insights into the nonlinear dynamic of the orbital components suggest considering astronomical signals as composite feedback lagged responses paced by orbitals and damped (Early Pliocene) or amplified (Mid-Late Pleistocene) in a range of − 100 to + 400% the forcing. The Early Pliocene asymptotic decay of the δ18O and SST response sensitivity up to − 100% observed for the first time in all orbital responses is interpreted as damping effect of a wide global forest cover along with a possible high ocean primary productivity, through the CO2-related negative feedbacks during time of global greenhouse. An anomalous post-Mid-Pleistocene Transition (MPT) sharply declines to near-zero in obliquity response sensitivity observed in both global δ18O and tropical SST, suggesting an attenuation mechanism of the obliquity driving force and a reduction of the related feedback amplification processes. It is hypothesized the post-MPT obliquity damping has contributed to the strengthening of the short eccentricity response by mitigating the obliquity “ice killing”, favoring a long-life ice sheet sensitive to a synergistic ~ 100-kyr amplification of positive feedback processes during the time of a global icy state. The global δ18O, the tropical SST, and the global ΔSST trend components, all explaining ~ 76% of the Plio-Pleistocene variance and significantly modifying the mean climate state, appear to be related to the long-term pCO2 proxies, supposedly controlled ... |
format |
Article in Journal/Newspaper |
author |
Paolo Viaggi |
author_facet |
Paolo Viaggi |
author_sort |
Paolo Viaggi |
title |
δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
title_short |
δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
title_full |
δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
title_fullStr |
δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
title_full_unstemmed |
δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
title_sort |
δ18o and sst signal decomposition and dynamic of the pliocene-pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend |
publisher |
SpringerOpen |
publishDate |
2018 |
url |
https://doi.org/10.1186/s40645-018-0236-z https://doaj.org/article/479a1dcb9bdd4cb7bfe11343c9d7bf9f |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Progress in Earth and Planetary Science, Vol 5, Iss 1, Pp 1-37 (2018) |
op_relation |
http://link.springer.com/article/10.1186/s40645-018-0236-z https://doaj.org/toc/2197-4284 doi:10.1186/s40645-018-0236-z 2197-4284 https://doaj.org/article/479a1dcb9bdd4cb7bfe11343c9d7bf9f |
op_doi |
https://doi.org/10.1186/s40645-018-0236-z |
container_title |
Progress in Earth and Planetary Science |
container_volume |
5 |
container_issue |
1 |
_version_ |
1766031989409841152 |