缺少HONO的气相源从热带层的泽佩林测量中推断出来
Xin Li1, Franz Rohrer, Andreas Hofzumahaus
1Institut für Energie-und Klimaforschung: Troposphäre (IEK-8), Forschungszentrum Jülich, Jülich, Germany.
Science (New York, N.Y.)
|April 19, 2014
概括
气态酸 (HONO) 对大气化学至关重要. 新的飞船观测揭示了重要的气相HONO源,表明其对基激素 (OH) 的影响被高估了.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 空气质量研究 空气质量研究
背景情况:
- 气态酸 (HONO) 是热层中基 (OH) 的关键前体.
- 基基 (OH) 对于大气的自我清洁和调节甲和臭氧等温室气体至关重要.
- 由于有限的测量,在热带层中HONO的垂直分布和来源尚不清楚.
研究的目的:
- 调查HONO在热层的垂直分布和预算.
- 在自由热带层中识别和描述HONO源.
- 重新评估HONO对大气基 (OH) 度的影响.
主要方法:
- 在地观测HONO度和相关化学物种在Zeppelin飞船上的现场观测.
- 在温度逆转层中收集的大气数据的分析.
- 预算计算量化HONO生产和损失过程.
主要成果:
- 观察到高度的HONO在阳光照射的层表面上方,通过温度反转分开.
- 有证据表明,强烈的气相HONO生产机制涉及氧化和潜在的氧化基.
- 观察到的HONO生产特征表明当前的模型高估了它对OH丰富性的贡献.
结论:
- 一个重要的,以前被低估的HONO气相源存在于阳光照亮的热层.
- 在控制热层OH度方面,HONO的作用可能远远低于以前的假设.
- 需要进一步的研究来完善对HONO化学及其对空气质量和气候的影响的理解.
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