天津市氨排放清单建立及时空分布特征分析

Analysis of Ammonia Emission Inventory Establishment and Its Temporal-spatial Characteristics in Tianjin

根据各类氨排放源活动水平数据,采用排放因子法,估算了天津市氨排放清单,结合中尺度气象模式WRF和排放清单处理模式SMOKE,在分析天津市人为源氨排放的时空分布特征的基础上建立了2017年天津市高时空分辨率氨排放清单。结果表明,2017年天津市氨排放量为57.45 kt,畜禽养殖和氮肥施用是排放贡献最大的排放源,分别占排放总量的49.3%和33.6%;在畜禽养殖源氨排放中,奶牛、蛋鸡的排放量最大,占畜禽养殖排放总量的46.9%,其次是生猪和肉牛,分别占14.3%和13.8%;武清区、宝坻区、蓟州区等天津市西部及北部区域是氨排放主要贡献区域,占天津市氨排放总量的65.5%,且该区域的氨排放具有显著的时间变化特征,表现为12:00、18:00左右是排放量较高时间段。

Based on the activity data of ammonia emission sources,the ammonia emission of Tianjin City was estimated using the emission factors of various ammonia sources.Integrate weather research and forecasting(WRF)and sparse matrix operator kernel emission model(SMOKE),a 2017-based high temporal-spatial ammonia emission inventory for Tianjin City was developed based on the emission characteristics.The results showed that the total ammonia emission of Tianjin City was 57.45 kt in 2017.Livestock and application of N fertilizer were main contributors,accounting for 49.3%and 33.6%of total NH 3 emission,respectively.In ammonia emissions from livestock breeding,milk cow and hen were the largest contributor with 46.9%of total livestock emission,followed by the natal pig and beef cattle with contributions of 14.3%and 13.8%.Western and Northern regions of Tianjin City included Wuqing,Baodi and Jizhou were the main contribution regions with 65.5%,and the ammonia emission in the region had a significant temporal characteristics,12:00 and 18:00 were the high ammonia emission periods.