Aircraft mass budgeting to measure CO2 emissions of Rome, Italy.

摘要: Aircraft measurements were used to estimate the CO2 emission rates of city Rome, assessed against high-resolution inventorial data. Three experimental flights made, composed vertical soundings measure Planetary Boundary Layer (PBL) properties, and circular horizontal transects at various altitudes around area. City level emissions associated uncertainties computed by means mass budgeting techniques, obtaining a positive net flux 14.7 ± 4.5, 2.5 1.2, 10.3 1.2 μmol m−2 s−1 for three flights. Inventorial fluxes time spatial temporal disaggregation gross inventory, 10.9 2.5, 9.6 1.3, 17.4 s−1. The largest differences between two dataset are with greater variability wind speed direction in boundary layer during measurements. Uncertainty partitioned into components related flows top surface flow, revealed that latter dominates total uncertainty presence wide concentration free troposphere (up 7 ppm), while it is minor term uniform tropospheric concentrations study area (within 2 ppm). Overall, we demonstrate how small aircraft may provide integrate validate inventories. Optimal atmospheric conditions measurement strategies deployment finally discussed.