Akabane, Thomas K; Daniau, Anne-Laure; de Oliveira, Paulo Eduardo; Duarte, Danilo S; Hanquiez, Vincent; Romero-Ramirez, Alicia; Queffelec, Alain; Campos, Marília C; Mendes, Vinícius Ribau; Georget, Muriel; Chiessi, Cristiano Mazur: Microcharcoal record from sdiment core M125-95-3 off the São Francisco River Mouth, Eastern Tropical South America [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996122 (dataset in review)
Abstract:
The São Francisco basin (SFB) is the largest watershed in eastern tropical South America, encompassing vast areas of savannas, xeric vegetation, and tropical forests. Here, we present a 72,000 years of microcharcoal record, including number and area of microcharcoal particles, of the SFB based on a semi-automated microcharcoal quantification method of the marine sediment core M125-95-3 (Latitude: -10.945; Longitude: -36.2057). Microcharcoal was identified and quantified using an approach combining chemical treatment, Raman spectroscopy for dark-particle identification, slide-scanning, and image analysis. Our results show that enhanced fire activity was closely linked to the expansion of open savannas, modulated by changes in the precipitation regime that were likely driven by orbital- and millennial-scale variability. The most intense fire regime, between 32 and 22 ka, coincided with the maximum expansion of open C4-dominated vegetation likely due to enhanced precipitation seasonality associated with a low obliquity phase.
Related to:
Akabane, Thomas K; Daniau, Anne-Laure; de Oliveira, Paulo Eduardo; Duarte, Danilo S; Hanquiez, Vincent; Romero-Ramirez, Alicia; Queffelec, Alain; Campos, Marília C; Mendes, Vinicius J; Georget, Muriel; Chiessi, Cristiano Mazur (in review): Fire regime in eastern tropical South America driven by hydroclimate changes at orbital and millennial timescales. Global and Planetary Change
Coverage:
Latitude: -10.945000 * Longitude: -36.205700
Date/Time Start: 2016-04-08T20:23:00 * Date/Time End: 2016-04-08T20:23:00
Minimum DEPTH, sediment/rock: 0.070 m * Maximum DEPTH, sediment/rock: 7.360 m
Event(s):
M125_469-3 (M125-95-3) * Latitude: -10.945000 * Longitude: -36.205700 * Date/Time: 2016-04-08T20:23:00 * Elevation: -1897.0 m * Location: South Atlantic Ocean * Campaign: M125 (SAMBA) * Basis: Meteor (1986) * Method/Device: Piston corer (PC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Depth, top/min | Depth top | m | Akabane, Thomas K | ||
| 2 | Depth, bottom/max | Depth bot | m | Akabane, Thomas K | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Akabane, Thomas K | Geocode | |
| 4 | AGE | Age | ka BP | Akabane, Thomas K | Age, calibrated | Geocode – present = 1950 CE |
| 5 | Microcharcoal | myChar | #/g | Akabane, Thomas K | Microcharcoal concentration, expressed as the number of particles per gram of dry sediment. | |
| 6 | Microcharcoal surface, per unit sediment dry mass | myChar surf/sed dm | µm2/g | Akabane, Thomas K | Total microcharcoal surface area per gram of dry sediment. | |
| 7 | Microcharcoal, flux | myChar flux | #/cm2/a | Akabane, Thomas K | Mass-normalized microcharcoal accumulation rate calculated from particle concentration and sediment accumulation rate, expressed as the number of charcoal particles per gram of dry sediment normalized by sediment accumulation rate. | |
| 8 | Microcharcoal, area, flux | myChar area flux | (µm/g)*(cm/a) | Akabane, Thomas K | Calculated | Mass-normalized microcharcoal surface area influx, calculated from charcoal surface area concentration and sediment accumulation rate. |
| 9 | Elongation ratio | Elongation | Akabane, Thomas K | Calculated | Mean length-to-width (L/W) ratio of microcharcoal particles. |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
889 data points