Figure 4.
Ratio of fluoranthene to fluoranthene and pyrene (FL/(FL + PY)) in sediment cores collected from two lakes (2014‐X and 2014‐Z) adjacent to Namur Lake compared to estimated year; locations are shown in Figure S1. Horizontal dashed lines indicate ranges for suggesting the average origin of PAHs using the FL/(FL + PY) ratio (pyrogenic, petrogenic, and petroleum combustion; see Yunker et al., 2002); data are available from https://www.canada.ca/en/environment-climate-change/services/oil-sands-monitoring/monitoring-water-quality-alberta-oil-sands.html. Core section dates are available from Summers et al. (2016)