Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle
International audience We present a new multi-proxy reconstruction of sea-surface properties spanning the last 140 ka in the IMAGES Core MD02-2529 located in the eastern tropical Pacific Ocean off Costa Rica. Spectral analysis of the records allowed us to examine the ecological imprints of orbital c...
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ftcollegfrance:oai:HAL:hal-01458308v1 2024-06-23T07:56:56+00:00 Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle Ivanova, Elena V. Beaufort, Luc, L Vidal, Laurence Kucera, Michal 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) Zentrum für Marine Umweltwissenschaften Bremen (MARUM) Universität Bremen 2012-04 https://hal.science/hal-01458308 https://doi.org/10.1016/j.quascirev.2012.02.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2012.02.020 hal-01458308 https://hal.science/hal-01458308 doi:10.1016/j.quascirev.2012.02.020 ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-01458308 Quaternary Science Reviews, 2012, 40, pp.64-77. ⟨10.1016/j.quascirev.2012.02.020⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftcollegfrance https://doi.org/10.1016/j.quascirev.2012.02.020 2024-06-13T23:41:08Z International audience We present a new multi-proxy reconstruction of sea-surface properties spanning the last 140 ka in the IMAGES Core MD02-2529 located in the eastern tropical Pacific Ocean off Costa Rica. Spectral analysis of the records allowed us to examine the ecological imprints of orbital changes on planktic foraminiferal and coccolithophore assemblages and on the pattern of primary production in the Eastern Equatorial Pacific, north of the Equatorial upwelling. Independent productivity reconstructions based on phyto- and zooplankton assemblages show a coherent pattern dominated by orbital precession, which appears to have control productivity changes recorded in the studied core over the last glacial interglacial cycle. The proposed mechanism of this control invokes an atmospheric forcing associated with equatorial insolation maxima in spring and fall with a period of similar to 20 ka. Faunal evidence for a stronger upper-ocean mixing with enhanced nutrient supply to the euphotic zone suggests a more vigorous local atmospheric circulation and associated enlargement of the Costa Rica Dome that influenced the core site at times of May insolation maxima. The last two terminations in the studied record are associated with conspicuous changes in planktic assemblages which require additional nutrient-delivery mechanisms to amplify the precession forcing. Our faunal and stable isotope data are in favour of the previously postulated nutrient advection via the Southern Ocean ``tunnelling'' operating during deglaciations. (C) 2012 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Southern Ocean Collège de France: HAL Pacific Southern Ocean Quaternary Science Reviews 40 64 77 |
institution |
Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Ivanova, Elena V. Beaufort, Luc, L Vidal, Laurence Kucera, Michal Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We present a new multi-proxy reconstruction of sea-surface properties spanning the last 140 ka in the IMAGES Core MD02-2529 located in the eastern tropical Pacific Ocean off Costa Rica. Spectral analysis of the records allowed us to examine the ecological imprints of orbital changes on planktic foraminiferal and coccolithophore assemblages and on the pattern of primary production in the Eastern Equatorial Pacific, north of the Equatorial upwelling. Independent productivity reconstructions based on phyto- and zooplankton assemblages show a coherent pattern dominated by orbital precession, which appears to have control productivity changes recorded in the studied core over the last glacial interglacial cycle. The proposed mechanism of this control invokes an atmospheric forcing associated with equatorial insolation maxima in spring and fall with a period of similar to 20 ka. Faunal evidence for a stronger upper-ocean mixing with enhanced nutrient supply to the euphotic zone suggests a more vigorous local atmospheric circulation and associated enlargement of the Costa Rica Dome that influenced the core site at times of May insolation maxima. The last two terminations in the studied record are associated with conspicuous changes in planktic assemblages which require additional nutrient-delivery mechanisms to amplify the precession forcing. Our faunal and stable isotope data are in favour of the previously postulated nutrient advection via the Southern Ocean ``tunnelling'' operating during deglaciations. (C) 2012 Elsevier Ltd. All rights reserved. |
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) Zentrum für Marine Umweltwissenschaften Bremen (MARUM) Universität Bremen |
format |
Article in Journal/Newspaper |
author |
Ivanova, Elena V. Beaufort, Luc, L Vidal, Laurence Kucera, Michal |
author_facet |
Ivanova, Elena V. Beaufort, Luc, L Vidal, Laurence Kucera, Michal |
author_sort |
Ivanova, Elena V. |
title |
Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
title_short |
Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
title_full |
Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
title_fullStr |
Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
title_full_unstemmed |
Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle |
title_sort |
precession forcing of productivity in the eastern equatorial pacific during the last glacial cycle |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-01458308 https://doi.org/10.1016/j.quascirev.2012.02.020 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-01458308 Quaternary Science Reviews, 2012, 40, pp.64-77. ⟨10.1016/j.quascirev.2012.02.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2012.02.020 hal-01458308 https://hal.science/hal-01458308 doi:10.1016/j.quascirev.2012.02.020 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.02.020 |
container_title |
Quaternary Science Reviews |
container_volume |
40 |
container_start_page |
64 |
op_container_end_page |
77 |
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1802650335303434240 |