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通过稳定同位素技术确定城市沿海空气分区的有机排放源和二次形成

Yixi Qiu¹, J David Felix², Dorina Murgulet²

¹Center for Water Supply Studies, Department of Physical and Environmental Science, Texas A&M University-Corpus Christi, Corpus Christi, TX, USA 78412; Department of Integrative Biology, Michigan State University, East Lansing, MI, USA 48824.

Environmental pollution (Barking, Essex : 1987)

|December 17, 2023

概括

雨水中溶解的有机 (DON) 对沿海生态系统产生影响. 这项研究确定了车辆是沿海城市大气有机 (ON) 的主要来源,其次是海洋排放和二次形成.

科学领域:

环境化学环境化学
大气科学大气科学
海洋科学海洋科学

背景情况:

大气中 (N) 研究在很大程度上忽略了有机 (ON).
溶解有机 (DON) 沉积显著影响沿海水质和初级生产.
极其需要对大气中的ON进行描述,特别是在沿海空气流域.

研究的目的:

测量 DON 在雨水中的度和同位素组成.
用稳定同位素混合模型确定沿海城市的ON排放源分配.
填补有关ON湿沉积和小沿海城市地区排放源的知识空白.

主要方法:

在一个小的沿海城市收集雨水样本.
测量了DON度和稳定的同位素比率 (δ¹⁵N-DON).
应用了稳定同位素混合模型来分配ON的来源.

主要成果:

平均DON度为10.6±7.6μM,占雨水中总溶解的29%.
平均雨水 δ¹⁵N-DON 值为 8.3 ± 5.3 ‰.
车辆被确定为主要的ON源 (35 ± 15%),其次是海洋排放 (24 ± 16%),有机胺 (18 ± 11%),有机酸盐 (17 ± 11%),生物质燃烧 (8 ± 3%).

结论:

车辆是沿海城市环境中大气ON的主要贡献者.
在某些条件下 (例如,肥料应用) 二级ON形成可以变得显著,与初级来源竞争.
这些发现为类似地区的大气减缓战略和沿海流域恢复计划提供了信息.

关键词:

沿海的空气分流区.有机的有机.稳定同位素混合模型模型湿沉积的湿沉积方式

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