Introduction
The supporting information contains additional text and figures focusing
on simulation experiments for background influences (Text S1) and
associated figures (Figure S1-S2), along with additional figures
demonstrating (1) the calculation of boundary layer tracer enrichments
from boundary layer and free troposphere data (Figure S3) and (2) the
influence of surface flux perturbations to biogenic CO emissions on
atmospheric tracer-tracer regressions (Figure S4).