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估计混合森林树冠内反应性和硫的源下流分布和流动

Zhiyong Wu¹, John T Walker², A Christopher Oishi³

¹ORISE Fellow at the Office of Research and Development, US Environmental Protection Agency, Durham, NC, USA.

Agricultural and forest meteorology

|June 24, 2025

概括

这项研究使用逆向建模来量化森林中的空气污染物交换. 森林是氨 (NH3) 的重要沉积点,树叶驱动和硫沉积.

科学领域:

环境化学环境化学
大气科学大气科学
森林生态森林生态

背景情况:

了解森林树冠上的垂直污染物分布对于土壤-植被-大气交换过程至关重要.
活性 (N) 和硫 (S) 化合物对森林生态系统产生重大影响.

研究的目的:

为了估计森林树冠中的反应性N和S化合物的源-沉降和流量概况.
为了评估不同的反向建模方法,用于污染物在天窗内的运输.

主要方法:

采用NH3,HNO3,SO2和NH4+,NO3和SO42颗粒物的平均度配置文件实施了反向建模.
利用了三个反向方法,包括一个以垂直速度偏斜的欧勒尔模型 (EUL).
根据可感的热量流量测量验证的模型性能.

主要成果:

森林是氨 (NH3) 的净水槽,在天花板上方向下流动.
在生长季节,冠状叶片占反应性N和S吸收的80-90%.
HNO3,SO2,NO3-,NH4+和SO42-的沉积是单向的,并且随着高度的增加而增加.

结论:

森林的树冠,特别是树叶,是大气反应性N和S的主要沉积点.
欧勒尔模型有效地捕捉了污染物流,而电阻模型需要改进垃圾交换和NH3补偿点的参数化.
结果支持临界负载评估,并指导森林生态系统交换模型的开发.

关键词:

这是一个反向模型.有活性的反应性.有活性硫的反应硫.这是源-沉没的源.动荡的流量概况.

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