Genet M., Daniau A. L., Mouillot Florent, Hanquiez V., Schmidt S., David V., Georget M., Abrantes F., Anschutz P., Bassinot F., Bonnin J., Dennielou B., Eynaud F., Hodell D. A., Mulder T., Naughton F., Rossignol L., Tzedakis P., Sanchez-Goni M. F. (2021). Modern relationships between microscopic charcoal in marine sediments and fire regimes on adjacent landmasses to refine the interpretation of marine paleofire records : an Iberian case study. Quaternary Science Reviews, 270, p. 107148 [17 p.]. ISSN 0277-3791.
Titre du document
Modern relationships between microscopic charcoal in marine sediments and fire regimes on adjacent landmasses to refine the interpretation of marine paleofire records : an Iberian case study
Année de publication
2021
Auteurs
Genet M., Daniau A. L., Mouillot Florent, Hanquiez V., Schmidt S., David V., Georget M., Abrantes F., Anschutz P., Bassinot F., Bonnin J., Dennielou B., Eynaud F., Hodell D. A., Mulder T., Naughton F., Rossignol L., Tzedakis P., Sanchez-Goni M. F.
Source
Quaternary Science Reviews, 2021,
270, p. 107148 [17 p.] ISSN 0277-3791
Marine microcharcoal records provide invaluable information to understand changes in biomass burning and its drivers over multiple glacial and interglacial cycles and to evaluate fire models under warmer climates than today. However, quantitative reconstructions of burnt area, fire intensity and frequency from these records need calibration studies of the current fire-microcharcoal relationship. Here, we present the analysis of microcharcoal concentration and morphology in 102 core-top sediment samples collected in the Iberian margin and the Gulf of Cadiz. We show that microcharcoal concentrations are influenced by the water depth or the distance from the river mouth. At regional scale, the mean microcharcoal concentrations and microcharcoal elongation (length to width ratio) show a marked latitudinal variation in their distribution, primarily controlled by the type of burnt vegetation in the adjacent continent. High microcharcoal concentrations in marine sediments represent rare, large and intense fires in open Mediterranean woodlands. Based on these results, the increasing trend of microcharcoal concentrations recorded since 8 ka in the well-known marine sedimentary core MD95-2042 off the Iberian margin indicates the occurrence of large and infrequent fires of high intensity due to the progressive degradation of the Mediterranean forest and the expansion of shrublands.
Plan de classement
Sciences du milieu [021]
;
Limnologie physique / Océanographie physique [032]
;
Géologie et formations superficielles [064]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
ATLANTIQUE ; ESPAGNE ; CADIX GOLFE ; ZONE MEDITERRANEENNE
Localisation
Fonds IRD [F B010083178]
Identifiant IRD
fdi:010083178
