从BVOC测量结果推断亚马逊地区OH激素度的日间变化
A Ringsdorf1, A Edtbauer2, J Vilà-Guerau de Arellano2,3
1Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany. A.Ringsdorf@mpic.de.
Scientific reports
|September 9, 2023
概括
这项研究揭示了亚马逊雨林中基 (OH) 的变异性. OH度在早上和下午早些时候达到峰值,受生物源排放和大气条件的影响.
科学领域:
- 大气化学 大气化学
- 生物地质化学生物地质化学
- 热带气象学 热带气象学
背景情况:
- 生物性挥发性有机化合物 (BVOC) 通过基基 (OH) 的氧化显著影响热带雨林上的大气化学.
- 了解OH的根性日间变化对于评估粒子生成和关键大气气体的寿命至关重要.
研究的目的:
- 在干旱季节实证地确定亚马逊雨林森林-大气界面内的日间OH基变化.
- 调查控制OH基度的因素,包括BVOC排放,NOx,流和光解.
主要方法:
- 利用生物源性挥发性有机化合物 (BVOC) 测量来推断OH基的度.
- 应用动态时间扭曲来分析大气边界层 (80-325米) 内的混合时间.
- 将经验发现与DALES,WRF-Chem和EMAC大气化学模型的结果进行比较.
主要成果:
- 从经验上确定了从7点00分到15点00分的80-325米之间的日间OH基的变化.
- 在测量期间,观察到混合时间的中位数从105分钟减少到15分钟.
- 确定了清晨OH峰值 (07:00-08:00 LT) 和最大OH度为2.2 × 10^6分子cm^-3在 14:00 LT.
结论:
- OH激素的度与BVOC排放,NOx积累,对流流和光解速率密切相关.
- 该研究提供了重要的实证数据,用于验证和改进热带地区的大气化学模型.
- 这些发现增强了我们对影响亚马逊盆地的空气质量和气候的大气过程的理解.
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