Source decomposition of eddy-covariance CO₂ flux measurements for evaluating a high-resolution urban CO₂ emissions inventory

Abstract We present the comparison of source-partitioned CO 2 flux measurements with a high-resolution urban emissions inventory (Hestia). Tower-based and 14 C are used to partition net into fossil biogenic components. A footprint model is quantify spatial variation in measurements. compare daily cycle structure Hestia eddy-covariance derived fuel on seasonal basis. exceed measured by 0.36 µ mol m ?2 s ?1 (3.2%) cold season 0.62 (9.1%) warm season. The fluxes both products matches closely, correlations hourly mean 0.86 (cold season) 0.93 (warm season). spatially averaged also agree each persistent pattern differences during seasons that may suggest bias related residential heating emissions. In addition, season, magnitudes average daytime biological uptake nighttime respiration at this site approximately 15% 27% over same time period, contradicting common assumptions no significant exchange northern cities winter. This work demonstrates effectiveness using trace gas ratios adapt environments for disaggregating anthropogenic ecosystem high temporal resolution.