Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13
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 expres...
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Online Access: | http://hdl.handle.net/10400.1/14831 https://doi.org/10.1016/j.quascirev.2020.106573 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/14831 2023-05-15T16:40:47+02:00 Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 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 2020 http://hdl.handle.net/10400.1/14831 https://doi.org/10.1016/j.quascirev.2020.106573 eng eng Elsevier info:eu-repo/grantAgreement/FCT/5876-PPCDTI/100157/PT 0277-3791 http://hdl.handle.net/10400.1/14831 doi:10.1016/j.quascirev.2020.106573 openAccess Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets article 2020 ftunivalgarve https://doi.org/10.1016/j.quascirev.2020.106573 2022-11-02T01:01:51Z 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. 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/3396/2014 info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Ice Sheet Universidade do Algarve: Sapienta Quaternary Science Reviews 247 106573 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets |
spellingShingle |
Mid-Brunhes event Interglacial MIS 13 Mediterranean vegetation Model-data comparison Insolation Ice-sheets 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 Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
topic_facet |
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. 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/3396/2014 info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
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_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_sort |
Oliveira, Dulce |
title |
Combination of insolation and ice-sheet forcing drive enhanced humidity in northern subtropical regions during MIS 13 |
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 |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10400.1/14831 https://doi.org/10.1016/j.quascirev.2020.106573 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
info:eu-repo/grantAgreement/FCT/5876-PPCDTI/100157/PT 0277-3791 http://hdl.handle.net/10400.1/14831 doi:10.1016/j.quascirev.2020.106573 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106573 |
container_title |
Quaternary Science Reviews |
container_volume |
247 |
container_start_page |
106573 |
_version_ |
1766031198356766720 |