Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/14831 |
Resumo: | Marine Isotope Stage (MIS) 13, similar to 533-478 ka, has received particular attention due to the unexpected enhancement of monsoon systems under a cool climate characterized by lower atmospheric CO2 and larger ice volume than many other interglacials. Key questions remain about its regional expression (intensity, climate variability, length), and underlying forcing factors, in particular at the mid-latitudes. Here we examine the SW Iberian vegetation, terrestrial climate and sea surface temperature (SST) variability during MIS 13 by combining pollen and biomarker data from IODP Site U1385 with climate-model experiments. We show, for the first time, that despite strong precessional forcing, MIS 13 stands out for its large forest expansions with a reduced Mediterranean character alternating with muted forest contractions, indicating that this stage is marked by a cool-temperate climate regime with high levels of humidity. Results of our data-model comparison reveal that MIS 13 orbitally driven SW Iberian climate and vegetation changes are modulated by the relatively strong ice-sheet forcing. We find that the Northern Hemisphere ice-sheets prescribed at the MIS 13 climate optimum reinforce the insolation effect by increasing the tree fraction and both winter and summer precipitation. We propose that the interactions between ice-sheets and major atmospheric circulation systems may have resulted in the persistent influence of the mid-latitude cells over the SW Iberian region, which led to intensified moisture availability and reduced seasonality, and, in turn, to a pronounced expansion of the temperate forest. |
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Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13Mid-Brunhes eventInterglacial MIS 13Mediterranean vegetationModel-data comparisonInsolationIce-sheetsMarine Isotope Stage (MIS) 13, similar to 533-478 ka, has received particular attention due to the unexpected enhancement of monsoon systems under a cool climate characterized by lower atmospheric CO2 and larger ice volume than many other interglacials. Key questions remain about its regional expression (intensity, climate variability, length), and underlying forcing factors, in particular at the mid-latitudes. Here we examine the SW Iberian vegetation, terrestrial climate and sea surface temperature (SST) variability during MIS 13 by combining pollen and biomarker data from IODP Site U1385 with climate-model experiments. We show, for the first time, that despite strong precessional forcing, MIS 13 stands out for its large forest expansions with a reduced Mediterranean character alternating with muted forest contractions, indicating that this stage is marked by a cool-temperate climate regime with high levels of humidity. Results of our data-model comparison reveal that MIS 13 orbitally driven SW Iberian climate and vegetation changes are modulated by the relatively strong ice-sheet forcing. We find that the Northern Hemisphere ice-sheets prescribed at the MIS 13 climate optimum reinforce the insolation effect by increasing the tree fraction and both winter and summer precipitation. We propose that the interactions between ice-sheets and major atmospheric circulation systems may have resulted in the persistent influence of the mid-latitude cells over the SW Iberian region, which led to intensified moisture availability and reduced seasonality, and, in turn, to a pronounced expansion of the temperate forest.IF/01489/2015, SAICT-45-2017-02, WARM WORLDS: 29897, 29029, UIDB/04326/2020, CEECIND/02208/2017, WarmWorld-PTDC/CTA-GEO/29897/2017, IF/01500/2014, PTDC/MAR-PRO/3396/2014ElsevierSapientiaOliveira, DulceDesprat, StéphanieYin, QiuzhenRodrigues, TeresaNaughton, FilipaTrigo, Ricardo M.Su, QianqianGrimalt, Joan O.Alonso-Garcia, MontserratH L Voelker, AntjeAbrantes, FatimaSánchez Goñi, Maria Fernanda2022-11-01T01:30:16Z20202020-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/14831eng0277-379110.1016/j.quascirev.2020.106573info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:27:10Zoai:sapientia.ualg.pt:10400.1/14831Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:05:47.755738Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
title |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
spellingShingle |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 Oliveira, Dulce Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets |
title_short |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
title_full |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
title_fullStr |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
title_full_unstemmed |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
title_sort |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
author |
Oliveira, Dulce |
author_facet |
Oliveira, Dulce Desprat, Stéphanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian Grimalt, Joan O. Alonso-Garcia, Montserrat H L Voelker, Antje Abrantes, Fatima Sánchez Goñi, Maria Fernanda |
author_role |
author |
author2 |
Desprat, Stéphanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian Grimalt, Joan O. Alonso-Garcia, Montserrat H L Voelker, Antje Abrantes, Fatima Sánchez Goñi, Maria Fernanda |
author2_role |
author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Oliveira, Dulce Desprat, Stéphanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian Grimalt, Joan O. Alonso-Garcia, Montserrat H L Voelker, Antje Abrantes, Fatima Sánchez Goñi, Maria Fernanda |
dc.subject.por.fl_str_mv |
Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets |
topic |
Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets |
description |
Marine Isotope Stage (MIS) 13, similar to 533-478 ka, has received particular attention due to the unexpected enhancement of monsoon systems under a cool climate characterized by lower atmospheric CO2 and larger ice volume than many other interglacials. Key questions remain about its regional expression (intensity, climate variability, length), and underlying forcing factors, in particular at the mid-latitudes. Here we examine the SW Iberian vegetation, terrestrial climate and sea surface temperature (SST) variability during MIS 13 by combining pollen and biomarker data from IODP Site U1385 with climate-model experiments. We show, for the first time, that despite strong precessional forcing, MIS 13 stands out for its large forest expansions with a reduced Mediterranean character alternating with muted forest contractions, indicating that this stage is marked by a cool-temperate climate regime with high levels of humidity. Results of our data-model comparison reveal that MIS 13 orbitally driven SW Iberian climate and vegetation changes are modulated by the relatively strong ice-sheet forcing. We find that the Northern Hemisphere ice-sheets prescribed at the MIS 13 climate optimum reinforce the insolation effect by increasing the tree fraction and both winter and summer precipitation. We propose that the interactions between ice-sheets and major atmospheric circulation systems may have resulted in the persistent influence of the mid-latitude cells over the SW Iberian region, which led to intensified moisture availability and reduced seasonality, and, in turn, to a pronounced expansion of the temperate forest. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020 2020-01-01T00:00:00Z 2022-11-01T01:30:16Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/14831 |
url |
http://hdl.handle.net/10400.1/14831 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0277-3791 10.1016/j.quascirev.2020.106573 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133297963433984 |