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Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: Biomass burning history in East Asia during the last 4 million years recorded in elemental carbon variability at IODP site U1423

Fig. 4

a An example thermal optical transmittance (TOT) thermogram. Temperature change is represented as red line, and the corrected laser transmission ratio is represented by orange line. The carbon fraction detected by NDIR response is represented as black line. b The relationship between the ambient temperature and the original laser transmission generated by a Semi-Continuous OCEC Carbon Aerosol Analyzer manufactured by Sunset Laboratory. The temperature dependency of the raw laser transmission values was calibrated using a quadratic relationship, with the ambient temperatures shown as red dots

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