Self-sustained oscillations and global climate changes

Abstract The periodic changes of atmospheric CO2 and temperature over the last 5 Myr reveal three features that challenge current climate research, namely: (i) the mid-Pleistocene transition of dominant 41-kyr cycles to dominant 100-kyr cycles, (ii) the absence of a strong precession signal of appro...

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Autores principales:	Luis G. Arnaut, Santiago Ibáñez
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9428da29bdd24c01af1ab53eca377cb6
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spelling	oai:doaj.org-article:9428da29bdd24c01af1ab53eca377cb62021-12-02T15:39:49ZSelf-sustained oscillations and global climate changes10.1038/s41598-020-68052-92045-2322https://doaj.org/article/9428da29bdd24c01af1ab53eca377cb62020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-68052-9https://doaj.org/toc/2045-2322Abstract The periodic changes of atmospheric CO2 and temperature over the last 5 Myr reveal three features that challenge current climate research, namely: (i) the mid-Pleistocene transition of dominant 41-kyr cycles to dominant 100-kyr cycles, (ii) the absence of a strong precession signal of approximately 20 kyr, and (iii) the cooling through the middle and late Holocene. These features are not directly addressable by Earth’s orbital changes described by Milankovitch. Here we show that a closed photochemical system exposed to a constant illumination source can sustain oscillations. In this simple conceptual model, the oscillations are intrinsic to the system and occur even in the absence of periodic radiative forcing. With proper adaptations to the Earth system, this oscillator explains the main features of past climate dynamics. Our model places photosynthesis and the carbon cycle as key drivers of climate change. We use this model to predict the relaxation of a 1,000 PgC pulse of CO2. The removal of 50% of this CO2 will require one century, and will lead to a warmer and wetter future. However, more pronounced glaciation cycles emerge on the millennial timescale.Luis G. ArnautSantiago IbáñezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-18 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Luis G. Arnaut Santiago Ibáñez Self-sustained oscillations and global climate changes
description	Abstract The periodic changes of atmospheric CO2 and temperature over the last 5 Myr reveal three features that challenge current climate research, namely: (i) the mid-Pleistocene transition of dominant 41-kyr cycles to dominant 100-kyr cycles, (ii) the absence of a strong precession signal of approximately 20 kyr, and (iii) the cooling through the middle and late Holocene. These features are not directly addressable by Earth’s orbital changes described by Milankovitch. Here we show that a closed photochemical system exposed to a constant illumination source can sustain oscillations. In this simple conceptual model, the oscillations are intrinsic to the system and occur even in the absence of periodic radiative forcing. With proper adaptations to the Earth system, this oscillator explains the main features of past climate dynamics. Our model places photosynthesis and the carbon cycle as key drivers of climate change. We use this model to predict the relaxation of a 1,000 PgC pulse of CO2. The removal of 50% of this CO2 will require one century, and will lead to a warmer and wetter future. However, more pronounced glaciation cycles emerge on the millennial timescale.
format	article
author	Luis G. Arnaut Santiago Ibáñez
author_facet	Luis G. Arnaut Santiago Ibáñez
author_sort	Luis G. Arnaut
title	Self-sustained oscillations and global climate changes
title_short	Self-sustained oscillations and global climate changes
title_full	Self-sustained oscillations and global climate changes
title_fullStr	Self-sustained oscillations and global climate changes
title_full_unstemmed	Self-sustained oscillations and global climate changes
title_sort	self-sustained oscillations and global climate changes
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/9428da29bdd24c01af1ab53eca377cb6
work_keys_str_mv	AT luisgarnaut selfsustainedoscillationsandglobalclimatechanges AT santiagoibanez selfsustainedoscillationsandglobalclimatechanges
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Self-sustained oscillations and global climate changes

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