HALIUC, Aritina; DANIAU, Anne-Laure; MOUILLOT, Florent; CHEN, Wentao; LEYS, Bérangère; DAVID, Valerie; HANQUIEZ, Vincent; DENNIELOU, Bernard; SCHEFUSS, Enno; BAYON, Germain; CROSTA, Xavier

doi:10.1038/s43247-023-00800-x

Environnements et Paléoenvironnements OCéaniques [EPOC]

DANIAU, Anne-Laure

Environnements et Paléoenvironnements OCéaniques [EPOC]

MOUILLOT, Florent
Centre d’Ecologie Fonctionnelle et Evolutive [CEFE]

Langue

Article de revue

Ce document a été publié dans

Communications Earth & Environment. 2023-12, vol. 4, n° 1, p. 133

Résumé en anglais

Abstract Fires in Africa account for more than half of global fire-carbon emissions but the long-term evolution of fire activity and its link to global climate change remains elusive. Paleofire records provide descriptive information about fire changes through time, going beyond the range of satellite observations, although fire regime characteristics are challenging to reconstruct. To address this conceptual gap, we report here the abundance and morphometric data for a large set of microscopic charcoal samples ( n = 128) recovered from surface ocean sediments offshore Africa. We show that in subtropical Southern Africa, large and intense fires prevailing in open savanna-grassland ecosystems produce a high abundance of small and elongated microcharcoal particles. In contrast, in the forest ecosystems of equatorial and tropical regions of western and central Africa, low-intensity fires dominate, producing low amounts of squared microcharcoal particles. Microcharcoal concentration and morphotype in marine sediment records off Africa are thus indicative of fire regime characteristics. Applied to down-core marine charcoal records, these findings reveal that at orbital time-scale intense and large, open grassland-savanna fires occurred during wet periods in the sub-tropical areas. A strong contribution of fire carbon emissions during periods of precession and summer insolation maxima in the geological record is thus expected.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/188044

DOI

http://dx.doi.org/10.1038/s43247-023-00800-x

Project ANR

Reconstruction des surfaces brulées à partir des particules de microcharbon préservées dans le sédiment marin - ANR-19-CE01-0001

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

Voir/Ouvrir

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Microscopic charcoals in ocean sediments off Africa track past fire intensity from the continent

Langue

Ce document a été publié dans

Résumé en anglais

URI

DOI

Project ANR

Unités de recherche