SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial
Marine Isotope Stage (MIS) 13, ~533e478 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 (inte...
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ftunivlouvain:oai:dial.uclouvain.be:boreal:242251 2024-05-19T07:42:12+00:00 SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial Oliveira, Dulce Desprat, Stephanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian UCL - SST/ELI/ELIC - Earth & Climate 2020 http://hdl.handle.net/2078.1/242251 eng eng boreal:242251 http://hdl.handle.net/2078.1/242251 info:eu-repo/semantics/openAccess info:eu-repo/semantics/conferenceObject 2020 ftunivlouvain 2024-04-24T01:08:51Z Marine Isotope Stage (MIS) 13, ~533e478 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 climatemodel 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. Conference Object Ice Sheet DIAL@UCLouvain (Université catholique de Louvain) |
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Open Polar |
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DIAL@UCLouvain (Université catholique de Louvain) |
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ftunivlouvain |
language |
English |
description |
Marine Isotope Stage (MIS) 13, ~533e478 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 climatemodel 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. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Conference Object |
author |
Oliveira, Dulce Desprat, Stephanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian |
spellingShingle |
Oliveira, Dulce Desprat, Stephanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
author_facet |
Oliveira, Dulce Desprat, Stephanie Yin, Qiuzhen Rodrigues, Teresa Naughton, Filipa Trigo, Ricardo M. Su, Qianqian |
author_sort |
Oliveira, Dulce |
title |
SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
title_short |
SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
title_full |
SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
title_fullStr |
SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
title_full_unstemmed |
SW European vegetation and climate dynamics in a cooler world: insights from MIS 13 interglacial |
title_sort |
sw european vegetation and climate dynamics in a cooler world: insights from mis 13 interglacial |
publishDate |
2020 |
url |
http://hdl.handle.net/2078.1/242251 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
boreal:242251 http://hdl.handle.net/2078.1/242251 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1799481859461087232 |