When eastern India oscillated between desert versus savannah‐dominated vegetation
Autor(a) principal: | |
---|---|
Data de Publicação: | 2022 |
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/10400.1/18668 |
Resumo: | During the last glacial period, the tropical hydrological cycle exhibited large variability across orbital and millennial timescales. However, the response of the Indian summer monsoon (ISM), its related impact on terrestrial ecosystems, and associated forcing mechanisms remain controversial. Here we present a marine record of pollen-inferred vegetation changes suggesting that eastern India shifted from woody-savanna mosaics during Marine Isotopic Stage 3 to grasslands during the Last Glacial Maximum resulting from large-scale drying. Our data shows that ISM maximum is in phase with obliquity and precession maxima suggesting a dominant role of the Indian Ocean interhemispheric temperature gradient on glacial ISM variability. Persistent and abrupt dryland expansions of varying magnitude suggest rapid-scale onset of aridity during Heinrich Stadial events and during the Toba eruption. We propose that the amplitude of ISM drought events are initiated by high latitude and volcanic forcings, although modulated by precession. |
id |
RCAP_c50ebb84defdbb96d0a9559ea03ada94 |
---|---|
oai_identifier_str |
oai:sapientia.ualg.pt:10400.1/18668 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
When eastern India oscillated between desert versus savannah‐dominated vegetationIndian summer monsoonLast glacial periodPollen analysisHeinrich StadialsMillennial and orbital variationsDuring the last glacial period, the tropical hydrological cycle exhibited large variability across orbital and millennial timescales. However, the response of the Indian summer monsoon (ISM), its related impact on terrestrial ecosystems, and associated forcing mechanisms remain controversial. Here we present a marine record of pollen-inferred vegetation changes suggesting that eastern India shifted from woody-savanna mosaics during Marine Isotopic Stage 3 to grasslands during the Last Glacial Maximum resulting from large-scale drying. Our data shows that ISM maximum is in phase with obliquity and precession maxima suggesting a dominant role of the Indian Ocean interhemispheric temperature gradient on glacial ISM variability. Persistent and abrupt dryland expansions of varying magnitude suggest rapid-scale onset of aridity during Heinrich Stadial events and during the Toba eruption. We propose that the amplitude of ISM drought events are initiated by high latitude and volcanic forcings, although modulated by precession.Amer Assoc Advancement ScienceSapientiaZorzi, CoralieDesprat, StéphanieClément, CharlotteThirumalai, KaustubhOliveira, DulceAnupama, KrishnamurthyPrasad, SrinivasanMartinez, Philippe2022-12-19T16:46:30Z20222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/18668eng10.1029/2022GL0994171944-8007info: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:RCAAP2023-07-24T10:30:57Zoai:sapientia.ualg.pt:10400.1/18668Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:08:25.035746Repositório 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 |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
title |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
spellingShingle |
When eastern India oscillated between desert versus savannah‐dominated vegetation Zorzi, Coralie Indian summer monsoon Last glacial period Pollen analysis Heinrich Stadials Millennial and orbital variations |
title_short |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
title_full |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
title_fullStr |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
title_full_unstemmed |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
title_sort |
When eastern India oscillated between desert versus savannah‐dominated vegetation |
author |
Zorzi, Coralie |
author_facet |
Zorzi, Coralie Desprat, Stéphanie Clément, Charlotte Thirumalai, Kaustubh Oliveira, Dulce Anupama, Krishnamurthy Prasad, Srinivasan Martinez, Philippe |
author_role |
author |
author2 |
Desprat, Stéphanie Clément, Charlotte Thirumalai, Kaustubh Oliveira, Dulce Anupama, Krishnamurthy Prasad, Srinivasan Martinez, Philippe |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Zorzi, Coralie Desprat, Stéphanie Clément, Charlotte Thirumalai, Kaustubh Oliveira, Dulce Anupama, Krishnamurthy Prasad, Srinivasan Martinez, Philippe |
dc.subject.por.fl_str_mv |
Indian summer monsoon Last glacial period Pollen analysis Heinrich Stadials Millennial and orbital variations |
topic |
Indian summer monsoon Last glacial period Pollen analysis Heinrich Stadials Millennial and orbital variations |
description |
During the last glacial period, the tropical hydrological cycle exhibited large variability across orbital and millennial timescales. However, the response of the Indian summer monsoon (ISM), its related impact on terrestrial ecosystems, and associated forcing mechanisms remain controversial. Here we present a marine record of pollen-inferred vegetation changes suggesting that eastern India shifted from woody-savanna mosaics during Marine Isotopic Stage 3 to grasslands during the Last Glacial Maximum resulting from large-scale drying. Our data shows that ISM maximum is in phase with obliquity and precession maxima suggesting a dominant role of the Indian Ocean interhemispheric temperature gradient on glacial ISM variability. Persistent and abrupt dryland expansions of varying magnitude suggest rapid-scale onset of aridity during Heinrich Stadial events and during the Toba eruption. We propose that the amplitude of ISM drought events are initiated by high latitude and volcanic forcings, although modulated by precession. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-19T16:46:30Z 2022 2022-01-01T00:00:00Z |
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/10400.1/18668 |
url |
http://hdl.handle.net/10400.1/18668 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1029/2022GL099417 1944-8007 |
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 |
Amer Assoc Advancement Science |
publisher.none.fl_str_mv |
Amer Assoc Advancement Science |
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 |
instname_str |
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) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799133330498650112 |