在中国东北部典型城市的雪蒸发过程中释放的NH3
Xiaoteng Liu1, Hongsheng Jia1, Yunze Zhao1
1Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, No.5088 Xincheng Road, Changchun, 130118, Jilin Province, China.
Scientific reports
|January 3, 2025
概括
雪中的 (NH4+) 在蒸发过程中作为氨 (NH3) 气体重新排放,平均转化率为39.28%. 环境温度,风速和降雪量会影响这种排放,影响空气质量管理.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 地质化学 地质化学
背景情况:
- 氨 (NH3) 是一种关键的性大气气体,是二次盐的前体.
- 氨 (NH4+) 是大气颗粒污染物的主要组成部分,在降水中升高.
- 了解从雪蒸发中释放的NH3对于在降雪量较大地区的空气质量至关重要,比如中国东北部.
研究的目的:
- 调查来自中国东北长春雪蒸发的氨 (NH) 的再排放流量和速率.
- 为了确定影响NH3在雪蒸发和升华期间释放的因素.
- 评估功能区域和融雪剂对NH3再排放的影响.
主要方法:
- 从长春的五个降雪事件 (2023年11月 - 2024年3月) 收集了雪样.
- 在室内进行模拟的蒸发和升华实验.
- 分析了NH4+作为NH3重新发射的比率 (R),流量 (F) 和速率 (V).
主要成果:
- 作为NH4+重新发射的NH3的平均比率为39.28%±12.07%.
- 平均释放流量 (F) 为1624.58±2064.5μg/m2 ,平均释放速率 (V) 为361.33±465.31 ng/m2 .
- 再排放比率 (R) 与温度正相关,与风速和降雪量负相关. 商业区的再排放量最高.
结论:
- 雪的蒸发是中国东北部大气NH的重要来源.
- 环境因素和城市功能区域调节从雪中释放的NH.
- 这些发现有助于理解大气NH3循环,并改善空气质量管理策略.
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