The distribution of atmospheric CO₂ is not homogenous, primarily due to variations in the CO₂ budgets of regional terrestrial ecosystems. To formulate a comprehensive strategy to combat the increasing global CO₂ levels and associated warming, it is crucial to consider both the distribution of atmospheric CO₂ and the CO₂ budgets of ecosystems. This study focused on analyzing the relationship between regional atmospheric CO₂ and CO₂ budgets in China from 2010 to 2017. Initially, a robust estimation model of net ecosystem CO₂ exchange was developed to calculate CO₂ budgets using collected emission data. Subsequently, Pearson correlation, redundancy analysis, and geographically weighted regression techniques were employed to examine the link between atmospheric CO₂ levels, CO₂ budgets, and other meteorological factors at various spatial and temporal scales. The findings from the redundancy analysis and geographically weighted regression indicated that the atmospheric CO₂ content of each province could not be solely determined by the regional CO₂ budgets. However, a significant and positive correlation between atmospheric CO₂ levels and CO₂ budgets was observed in non-coastal provinces for a period of six months (R² ranging from 0.46 to 0.83). Consequently, it is essential to promote a balance between CO₂ emissions and the CO₂ uptake capacity of regional ecosystems. This balance would minimize positive CO₂ budgets and effectively mitigate the increase in atmospheric CO₂ levels.

A laboratory study was carried out using a vibrating system (SyGAVib) to produce particles from four soils collected in the central Tunisian region around Sfax. The aim of this device is to mimic dust emission by natural wind erosion. Using compositional analysis, the dust produced was compared to: dust generated in a wind tunnel by the same soils, fine sieved and original bulk soils, and naturally occurring aerosol samples collected in the same area. The relative quartz content strongly decreases from bulk to fine soils, and again from fine soils to both wind tunnel and vibration generated aerosols. Compositional data analysis (CoDA) clearly shows: a silica dilution effect in bulk soils, and that if silica is removed from the composition, the elemental compositions of fine soils and generated aerosols are similar but differ from bulk soils. Both aerosol generation methods produce material with chemical compositions that are also close to those measured in field-sampled aerosols, and the fine soil composition is much closer to that of field and laboratory aerosols than to the parent soil. Aerosols generated from soils in the laboratory, either using a vibrating system or a wind tunnel, can be used as surrogates of the particles collected directly in the field.