Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation

Abstract There were significant differences between the last two deglaciations, particularly in Atlantic Meridional Overturning Circulation (AMOC) and Antarctic warming in the deglaciations and the following interglacials. Here, we present transient simulations of deglaciation using a coupled atmosp...

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Autores principales:	Takashi Obase, Ayako Abe-Ouchi, Fuyuki Saito
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/286a1302ba79481889866e07e0c4b563
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spelling	oai:doaj.org-article:286a1302ba79481889866e07e0c4b5632021-11-28T12:18:04ZAbrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation10.1038/s41598-021-01651-22045-2322https://doaj.org/article/286a1302ba79481889866e07e0c4b5632021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01651-2https://doaj.org/toc/2045-2322Abstract There were significant differences between the last two deglaciations, particularly in Atlantic Meridional Overturning Circulation (AMOC) and Antarctic warming in the deglaciations and the following interglacials. Here, we present transient simulations of deglaciation using a coupled atmosphere–ocean general circulation model for the last two deglaciations focusing on the impact of ice sheet discharge on climate changes associated with the AMOC in the first part, and the sensitivity studies using a Northern Hemisphere ice sheet model in the second part. We show that a set of abrupt climate changes of the last deglaciation, including Bolling–Allerod warming, the Younger Dryas, and onset of the Holocene were simulated with gradual changes of both ice sheet discharge and radiative forcing. On the other hand, penultimate deglaciation, with the abrupt climate change only at the beginning of the last interglacial was simulated when the ice sheet discharge was greater than in the last deglaciation by a factor of 1.5. The results, together with Northern Hemisphere ice sheet model experiments suggest the importance of the transient climate and AMOC responses to the different orbital forcing conditions of the last two deglaciations, through the mechanisms of mass loss of the Northern Hemisphere ice sheet and meltwater influx to the ocean.Takashi ObaseAyako Abe-OuchiFuyuki SaitoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Takashi Obase Ayako Abe-Ouchi Fuyuki Saito Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
description	Abstract There were significant differences between the last two deglaciations, particularly in Atlantic Meridional Overturning Circulation (AMOC) and Antarctic warming in the deglaciations and the following interglacials. Here, we present transient simulations of deglaciation using a coupled atmosphere–ocean general circulation model for the last two deglaciations focusing on the impact of ice sheet discharge on climate changes associated with the AMOC in the first part, and the sensitivity studies using a Northern Hemisphere ice sheet model in the second part. We show that a set of abrupt climate changes of the last deglaciation, including Bolling–Allerod warming, the Younger Dryas, and onset of the Holocene were simulated with gradual changes of both ice sheet discharge and radiative forcing. On the other hand, penultimate deglaciation, with the abrupt climate change only at the beginning of the last interglacial was simulated when the ice sheet discharge was greater than in the last deglaciation by a factor of 1.5. The results, together with Northern Hemisphere ice sheet model experiments suggest the importance of the transient climate and AMOC responses to the different orbital forcing conditions of the last two deglaciations, through the mechanisms of mass loss of the Northern Hemisphere ice sheet and meltwater influx to the ocean.
format	article
author	Takashi Obase Ayako Abe-Ouchi Fuyuki Saito
author_facet	Takashi Obase Ayako Abe-Ouchi Fuyuki Saito
author_sort	Takashi Obase
title	Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
title_short	Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
title_full	Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
title_fullStr	Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
title_full_unstemmed	Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation
title_sort	abrupt climate changes in the last two deglaciations simulated with different northern ice sheet discharge and insolation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/286a1302ba79481889866e07e0c4b563
work_keys_str_mv	AT takashiobase abruptclimatechangesinthelasttwodeglaciationssimulatedwithdifferentnorthernicesheetdischargeandinsolation AT ayakoabeouchi abruptclimatechangesinthelasttwodeglaciationssimulatedwithdifferentnorthernicesheetdischargeandinsolation AT fuyukisaito abruptclimatechangesinthelasttwodeglaciationssimulatedwithdifferentnorthernicesheetdischargeandinsolation
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Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation

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