A Method Of Quickly Quantitative Estimating Sources Of Air Pollutants And Its Application

Quantitative estimation of the sources of air pollutants in target area plays an important role in effectively treating air pollution. Researchers have provided a variety of methods for quantitatively or qualitatively estimating the temporal and spatial distribution of airborne source regions. In order to solve the disadvantage that the method of jointly calculation of meteorological and atmospheric chemistry method can only get the qualitative results. In this paper, a method was esmodels consumes too much computational resources while the meteorological analysis tablished to quickly calculate the temporal and spatial distributions of the sources of air pollutants based on meteorological conditions and anthropogenic emission inventory. This method is implemented by using the FLEXPART Lagrangian particle dispersion model, WRF model, and multi-resolution emission inventory for China.This method is first applied and validated in a case study. The pollution case during 20-23 December 2015 was chosen to apportion the source distribution of air pollutants within target regions and durations. The method is approved to be feasible by comparing the results, the calculated contribution rates have similar temporal and spatial distributions with those from the WRF-Chem "zero-clearing" experiments,although some bias exists in quantity.Further discussion and analysis on uncertainty derive from tracer selection and parameters using was carried out. Experiments on tracers of NH₃ gas, NO₃ and SO₄ aerosol and their corresponding precursors of NH₃, NO2 and SO2 as the contribution weight were designed in another pollution episode of 14-17 January 2013. The results show that the selection of tracer and weight leads a deviation in values of the contribution rate of different regions and periods to target region and duration, but the regions and durations whose emissions agree with the results from WRF-Chem in trends of high or low contributions. The selection has a lower effect on low contribution regions, and some effect in neighbor regions and pollution property is needed to be considered in the calculation. Distinct uncertainty is located in local, so it is very necessary to include the pollution property in the determination of tracer and weight.This paper provides a fast and relatively accurate way to quantitatively estimate the sources of air pollutants for the target area, which can be used to quantitatively estimate the sources of air pollutants in a region.