我们分别基于排放因子法（E₁）和农业活动过程表征法（E₂）“自下而上”地建立了两套长三角地区2014年人为源氨排放清单，两个清单长三角按排放量分别为176.47万吨和106.70万吨。其中，化肥施用源和畜禽养殖源是最大排放源，贡献率约74%-84%。E₁氨排放总量约是E₂的1.6倍，农业源约是2倍。发现表征农业活动过程可以优化NH₃柱浓度空间分布的模拟结果, pH对排放因子的校正结果在碱性土壤环境下更合理。长三角地区除浙江西南部，整年处于富氨状态。如果对氨排放不采取有效控制措施，硝酸盐浓度可能将会进一步增加，削弱SO₂和NO_x减排对空气质量的改善效果。

       祝贺梦晨！

    Two inventories of NH₃ emissions of the Yangtze River Delta (YRD) region in eastern China were developed for 2014 based on the constant emission factors (E1) and those characterizing the agricultural processes (E2), respectively. The total emissions were calculated at 1765 and 1067 Gg, respectively, and agricultural activities (livestock farming and fertilizer use) were estimated to contribute 74-84% to total emissions in the two inventories.It proved that agricultural process could optimize the spatial distribution of NH₃ columns and the correction effect for emission factors by pH was more reasonable in the alkaline soil in this study. Major part of YRD were identified as NH₃-rich throughout the entire year except southwestern Zhejiang. Our finding also suggested that NO₃^- would increase if no control measures were taken for NH₃ emissions, resulting in reduced benefits of air quality improvement through SO₂ and NO_x emission abatement.

     Congratulations to mengchen!

The GR values in the YRD region simulated with the two inventories by month