"by hydrogen pyrolysis (see below).
Samples in three size fractions (>250 µm, 250–125 µm and 125–63 µm) were analysed
under a stereomicroscope (×20 magnification) while suspended in water.
Charcoal particles were counted and categorised by morphology using the system
developed by Enache and Cumming (2006).
Charcoal particles >125 µm are interpreted in this study as local, with
particles <125 µm interpreted as derived from the broader regional environment;
it is not possible to specify source areas with certainty due to ongoing debate
regarding the potential for long-distance transport of particles (see Vachula
et al., 2018 for discussion).
Charcoal count data were converted to charcoal accumulation rates (influx,
particles cm−2 year−1) using recorded sample volume and mean age derived
from the Bayesian age-depth model using the rBacon package."
•• I use figure 5 to digitize data for the different types of charcoal particles influx. I'll try to use a 1-pixel step in digitalization.