A millennial multi-proxy reconstruction of summer PDSI for Southern South America
International audience We present the first spatially explicit field reconstruction of the summer (DJF) Palmer Drought Severity Index (PDSI) for the Southern Hemisphere. Our multi-proxy reconstruction focuses on Southern South America (SSA, south of 20° S) and is based on a novel spectral analogue m...
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ftunivpoitiers:oai:HAL:insu-00643480v1 2024-09-15T17:47:32+00:00 A millennial multi-proxy reconstruction of summer PDSI for Southern South America Boucher, E. Guiot, Joel Chapron, Emmanuel Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre d'Orléans (ISTO) Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) ANR-06-VULN-0010,ESCARSEL,Evolution Séculaire du Climat dans les régions circum-Atlantiques et Réponse de Systèmes Eco-Lacustres(2006) 2011 https://insu.hal.science/insu-00643480 https://insu.hal.science/insu-00643480/document https://insu.hal.science/insu-00643480/file/cp-7-957-2011.pdf https://doi.org/10.5194/cp-7-957-2011 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-957-2011 insu-00643480 https://insu.hal.science/insu-00643480 https://insu.hal.science/insu-00643480/document https://insu.hal.science/insu-00643480/file/cp-7-957-2011.pdf doi:10.5194/cp-7-957-2011 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://insu.hal.science/insu-00643480 Climate of the Past, 2011, 7, pp.957-974. ⟨10.5194/cp-7-957-2011⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftunivpoitiers https://doi.org/10.5194/cp-7-957-2011 2024-07-18T03:12:20Z International audience We present the first spatially explicit field reconstruction of the summer (DJF) Palmer Drought Severity Index (PDSI) for the Southern Hemisphere. Our multi-proxy reconstruction focuses on Southern South America (SSA, south of 20° S) and is based on a novel spectral analogue method that aims at reconstructing low PDSI frequencies independently from higher frequencies. The analysis of past regimes and trends in extreme wet spells and droughts reveals considerable geographical and temporal variations over the last millennium in SSA. Although recent changes are in some cases notorious, most were not exceptional at the scale of the last thousand years. Our reconstruction highlights that low frequency water availability fluctuations in Patagonia were generally in antiphase with the rest of the subcontinent. Providing the fact that modern patterns of changes are transferable to the past, we show that such antiphases within SSA's hydroclimate could be attributed to the spatially contrasted response of summer PDSI to the Antarctic Oscillation (AAO). However, El Niño Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) signals are also embedded within the PDSI series during the 20th century. All these ocean-atmospheric forcings acted synergically, but the dominant influence appeared highly compartmentalized through space, highlighting clear AAO- (e.g. South Patagonia) and ENSO- (e.g. the Pampas) dominated regions. Our results therefore emphasize the complexity of water-availability fluctuations in SSA and their important dependence on external ocean-atmospheric forcings. Article in Journal/Newspaper Antarc* Antarctic Université de Poitiers: Publications de nos chercheurs.ses (HAL) Climate of the Past 7 3 957 974 |
institution |
Open Polar |
collection |
Université de Poitiers: Publications de nos chercheurs.ses (HAL) |
op_collection_id |
ftunivpoitiers |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes Boucher, E. Guiot, Joel Chapron, Emmanuel A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience We present the first spatially explicit field reconstruction of the summer (DJF) Palmer Drought Severity Index (PDSI) for the Southern Hemisphere. Our multi-proxy reconstruction focuses on Southern South America (SSA, south of 20° S) and is based on a novel spectral analogue method that aims at reconstructing low PDSI frequencies independently from higher frequencies. The analysis of past regimes and trends in extreme wet spells and droughts reveals considerable geographical and temporal variations over the last millennium in SSA. Although recent changes are in some cases notorious, most were not exceptional at the scale of the last thousand years. Our reconstruction highlights that low frequency water availability fluctuations in Patagonia were generally in antiphase with the rest of the subcontinent. Providing the fact that modern patterns of changes are transferable to the past, we show that such antiphases within SSA's hydroclimate could be attributed to the spatially contrasted response of summer PDSI to the Antarctic Oscillation (AAO). However, El Niño Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) signals are also embedded within the PDSI series during the 20th century. All these ocean-atmospheric forcings acted synergically, but the dominant influence appeared highly compartmentalized through space, highlighting clear AAO- (e.g. South Patagonia) and ENSO- (e.g. the Pampas) dominated regions. Our results therefore emphasize the complexity of water-availability fluctuations in SSA and their important dependence on external ocean-atmospheric forcings. |
author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre d'Orléans (ISTO) Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) ANR-06-VULN-0010,ESCARSEL,Evolution Séculaire du Climat dans les régions circum-Atlantiques et Réponse de Systèmes Eco-Lacustres(2006) |
format |
Article in Journal/Newspaper |
author |
Boucher, E. Guiot, Joel Chapron, Emmanuel |
author_facet |
Boucher, E. Guiot, Joel Chapron, Emmanuel |
author_sort |
Boucher, E. |
title |
A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
title_short |
A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
title_full |
A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
title_fullStr |
A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
title_full_unstemmed |
A millennial multi-proxy reconstruction of summer PDSI for Southern South America |
title_sort |
millennial multi-proxy reconstruction of summer pdsi for southern south america |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://insu.hal.science/insu-00643480 https://insu.hal.science/insu-00643480/document https://insu.hal.science/insu-00643480/file/cp-7-957-2011.pdf https://doi.org/10.5194/cp-7-957-2011 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://insu.hal.science/insu-00643480 Climate of the Past, 2011, 7, pp.957-974. ⟨10.5194/cp-7-957-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-957-2011 insu-00643480 https://insu.hal.science/insu-00643480 https://insu.hal.science/insu-00643480/document https://insu.hal.science/insu-00643480/file/cp-7-957-2011.pdf doi:10.5194/cp-7-957-2011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-7-957-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
3 |
container_start_page |
957 |
op_container_end_page |
974 |
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1810496933707382784 |