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首页> 外文期刊>Atmospheric environment >Implementation of a dynamical NH_3 emissions parameterization in CMAQ for improving PM_(2.5) simulation in Taiwan
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Implementation of a dynamical NH_3 emissions parameterization in CMAQ for improving PM_(2.5) simulation in Taiwan

机译：在CMAQ中实现动态NH_3排放参数化以改善台湾的PM_（2.5）模拟

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摘要

Ammonia (NH3) is an important precursor of inorganic fine particulate matter (PM2.5). Without specific information on the temporal variation in NH3 emissions, a simplified temporal variation in NH3 emissions is often used in chemical transport models. To better characterize NH3 emissions in an air quality model simulation for Taiwan, a dynamical NH3 emissions parameterization was applied to improve the temporal profile of NH3 emissions from livestock operations, synthetic nitrogen fertilizers, and standing crops. The Community Multiscale Air Quality (CMAQ) modeling simulation with a fixed NH3 emissions rate (the CONST experiment) presents a large positive bias in simulated nitrate and NH3, particularly during the nighttime and winter months. On the other hand, the CMAQ simulation with a dynamical NH3 emissions approach (the DYN experiment) improves the diurnal and seasonal variations and reduces the simulated bias. Moreover, according to the Taiwan emissions inventory, NH3 emissions from sewage accounts for a large portion (37%) of total NH3 emissions in Taiwan. The CMAQ simulation with the dynamical NH3 emissions approach and with a reduced level of NH3 emissions from sewage (the DYN1 experiment) was conducted to assess the possibility that the existing Taiwan emissions inventory may overestimate sewage NH3 emissions. The evaluations with observed NH3, nitrate, and ammonium wet deposition concentrations indicate that the DYN1 experiment performs better than the CONST and DYN experiments.
机译：氨（NH3）是无机细颗粒物（PM2.5）的重要前体。由于没有关于NH3排放的时间变化的具体信息，因此在化学迁移模型中经常使用简化的NH3排放的时间变化。为了在台湾的空气质量模型模拟中更好地描述NH3排放，应用了动态NH3排放参数化来改善畜牧业，合成氮肥和农作物产生的NH3排放的时间分布。具有固定的NH3排放速率的社区多尺度空气质量（CMAQ）模拟（CONST实验）在模拟的硝酸盐和NH3中表现出较大的正偏差，尤其是在夜间和冬季。另一方面，采用动态NH3排放方法的CMAQ模拟（DYN实验）改善了昼夜和季节变化并减少了模拟偏差。此外，根据台湾的排放清单，污水中的NH3排放量占台湾NH3总排放量的很大一部分（37％）。使用动态NH3排放方法和降低的污水中NH3排放水平进行了CMAQ模拟（DYN1实验），以评估现有台湾排放清单可能高估了污水中NH3排放的可能性。用观察到的NH3，硝酸盐和铵湿沉降浓度进行的评估表明，DYN1实验的性能优于CONST和DYN实验。

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