Precession and obliquity forcing of the South African monsoon revealed by sub-tropical fires
| dc.rights.license | open | en_US |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | DANIAU, Anne-Laure
IDREF: 12852538X | |
| hal.structure.identifier | Université Catholique de Louvain = Catholic University of Louvain [UCL] | |
| hal.structure.identifier | PAGES International Project Office | |
| dc.contributor.author | LOUTRE, Marie-France | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | SWINGEDOUW, Didier | |
| hal.structure.identifier | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine [AWI] | |
| dc.contributor.author | LAEPPLE, Thomas | |
| hal.structure.identifier | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE] | |
| hal.structure.identifier | Paléocéanographie [PALEOCEAN] | |
| dc.contributor.author | BASSINOT, Franck | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | MALAIZE, Bruno | |
| hal.structure.identifier | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE] | |
| hal.structure.identifier | Modélisation du climat [CLIM] | |
| dc.contributor.author | KAGEYAMA, Masa | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | CHARLIER, Karine | |
| hal.structure.identifier | Institut de recherche en astrophysique et planétologie [IRAP] | |
| dc.contributor.author | CARFANTAN, Hervé | |
| dc.date.accessioned | 2024-02-06T15:32:20Z | |
| dc.date.available | 2024-02-06T15:32:20Z | |
| dc.date.issued | 2023-06 | |
| dc.identifier.issn | 0277-3791 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/187935 | |
| dc.description.abstractEn | While the influence of precession on monsoon at low latitudes through insolation forcing is well-known, the role of obliquity is still debated since its influence on the distribution of incoming solar radiation is small in these regions. In southern Africa, long marine and terrestrial sedimentary records attest of a precessional influence on the South African monsoon at orbital time scale. The obliquity signal is occasionally observed in the geological records although modeling results suggest an influence of precession and obliquity on summer monsoon. Here, we present a record of microscopic charcoal from core MD96-2098 located off Namibia covering the past 184,000 years. Our record of fire activity reveals cyclic changes at frequencies of 23, 58 and 12 kyr À1 and lacks the obliquity signal at 41 kyr À1. Changes in fire over southern Africa are interpreted as shifts in large and intense fires spreading in open-grassland savanna as a result of orbitally-driven changes in rainfall intensity associated with the South African monsoon. We show that, despite the absence of a 41 kyr obliquity imprint, the presence of 23, 58 and 12 kyr À1 frequencies likely stems from a nonlinear response of fire to precipitation controlled by a combination of precession and obliquity frequencies, supporting the influence of obliquity on the South African monsoon. | |
| dc.description.sponsorship | Reconstruction des surfaces brulées à partir des particules de microcharbon préservées dans le sédiment marin - ANR-19-CE01-0001 | en_US |
| dc.language.iso | EN | en_US |
| dc.subject.en | Fire Biomass burning Heterodynes Monsoon Linear and non-linear response Marine sediment | |
| dc.subject.en | Fire | |
| dc.subject.en | Biomass burning | |
| dc.subject.en | Heterodynes | |
| dc.subject.en | Monsoon | |
| dc.subject.en | Linear andnon-linearresponse | |
| dc.subject.en | Marine sediment | |
| dc.title.en | Precession and obliquity forcing of the South African monsoon revealed by sub-tropical fires | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.1016/j.quascirev.2023.108128 | en_US |
| dc.subject.hal | Planète et Univers [physics] | en_US |
| bordeaux.journal | Quaternary Science Reviews | en_US |
| bordeaux.page | 108128 | en_US |
| bordeaux.volume | 310 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | PALEO | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-04103901 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | CC BY-NC-ND | en_US |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Quaternary%20Science%20Reviews&rft.date=2023-06&rft.volume=310&rft.spage=108128&rft.epage=108128&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=DANIAU,%20Anne-Laure&LOUTRE,%20Marie-France&SWINGEDOUW,%20Didier&LAEPPLE,%20Thomas&BASSINOT,%20Franck&rft.genre=article |
