邢台氨减排对京津冀PM2.5改善的溢出效益

氨减排会对周边大气PM_2.5污染改善带来潜在的溢出效益，但尚缺乏对其规律的探究.利用WRF-CAMx-PSAT模型模拟量化了典型城市(邢台)NH₃减排对周边地区大气PM_2.5浓度降低的溢出效益，探究了其在不同季节与不同NH₃减排比例下、对PM_2.5及其二次无机化学组分随距离变化的响应规律.结果表明：(1)NH₃减排在不同减排比例下对周边城市的PM_2.5及其二次组分均存在溢出效益，其效益随周边受体城市与减排城市相对距离的增加呈显著的指数下降的趋势；(2)在1月的溢出效益远高于7月，1月在不同减排比例下京津冀PM_2.5浓度下降值约为7月的7.4倍；(3)各组分溢出范围随着减排比例的增加不断扩大，NH₄⁺和SO₄^2-的溢出最远距离呈指数趋势上升，NO₃^-的溢出最远距离呈线性趋势上升；(4)...

Spillover Benefits of Ammonia Emission Reduction in Xingtai Area to the Improvement of Atmospheric PM2.5 Concentration in the Beijing-Tianjin-Hebei Region

Ammonia emission reduction would bring potential spillover benefits to the improvement of surrounding atmospheric PM_2.5 pollution, but the investigation of its patterns is lacking. The WRF-CAMx-PSAT model was used to quantify the spillover benefits of NH₃ emission reduction in a typical city （Xingtai） on the reduction in PM_2.5 concentrations in the surrounding area and to investigate the response patterns of PM_2.5 and its secondary inorganic chemical components with distance in different seasons and at different NH3 emission reduction ratios. The results showed that： ① the spillover benefits of NH₃ emission reduction on PM_2.5 and its secondary components in neighboring cities at different reduction ratios and the benefits showed a significant exponential decrease with the increase in the relative distance between the neighboring receptor cities and the reduction cities. ② The spillover benefits in January were much higher than those in July, and the reduction in PM_2.5 concentration in Beijing-Tianjin-Hebei at different reduction ratios in January was approximately 7.4 times that in July. ③ The spillover range was expanding with the increase in emission reduction ratio, the farthest distance of NH₄⁺ and SO₄^2- spillover was increasing exponentially, and the farthest distance of NO₃^- spillover was increasing linearly. ④ The spillover range and concentration change in NO₃^-, NH₄⁺, and SO₄^2- increased with the increase in the abatement ratio, in which the spillover range of NO₃^- was the farthest, approximately 3.6 times and 3.4 times that of NH₄⁺ and SO₄^2-, and the concentration change was the largest, approximately 2.6 times and 7.3 times that of NH₄⁺ and SO₄^2-.