Reconciling the differences between a bottom-up and inverse-estimated FFCO2 emissions estimate in a large US urban area

摘要: The INFLUX experiment has taken multiple approaches to estimate the carbon dioxide (CO 2 ) flux in a domain centered on city of Indianapolis, Indiana. One approach, Hestia, uses bottom-up technique relying mixture activity data, fuel statistics, direct measurement and modeling algorithms. A second Bayesian atmospheric inverse approach constrained by CO measurements Hestia emissions as prior flux. difference central two comes 0.94 MtC (an 18.7% difference) over eight-month period between September 1, 2012 April 30, 2013, statistically significant at 2-sigma level. Here we explore possible explanations for this apparent discrepancy an attempt reconcile estimates. We focus broad categories: 1) biases largest contributions 2) missing sources. Though there is some evidence small fossil (FFCO explanation calculated difference, find more support fluxes, with biological respiration these. Incorporation these differences bring inversion estimates into statistical agreement are additionally consistent wintertime 14 . conclude that comparison top-down must consider all highlight important contribution urban budgets animal biotic respiration. fluxes reconciles inverse-based domain.