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The role of a suburban forest in controlling vertical trace gas and OH reactivity distributions – a case study for the Seoul metropolitan area
Faraday Discussions ( IF 3.3 ) Pub Date : 2020-9-28 , DOI: 10.1039/d0fd00081g
Saewung Kim 1 , Roger Seco , Dasa Gu , Dianne Sanchez , Daun Jeong , Alex B Guenther , Youngro Lee , John E Mak , Luping Su , Dan Bi Kim , Youngjae Lee , Joon-Young Ahn , Tom Mcgee , John Sullivan , Russell Long , William H Brune , Alexander Thames , Armin Wisthaler , Markus Müller , Thomas Mikoviny , Andy Weinheimer , Melissa Yang , Jung-Hun Woo , Soyoung Kim , Hyunjoo Park
Affiliation  

We present trace gas vertical profiles observed by instruments on the NASA DC-8 and at a ground site during the Korea-US air quality study (KORUS) field campaign in May to June 2016. We focus on the region near the Seoul metropolitan area and its surroundings where both anthropogenic and natural emission sources play an important role in local photochemistry. Integrating ground and airborne observations is the major research goal of many atmospheric chemistry field campaigns. Although airborne platforms typically aim to sample from near surface to the free troposphere, it is difficult to fly very close to the surface especially in environments with complex terrain or a populated area. A detailed analysis integrating ground and airborne observations associated with specific concentration footprints indicates that reactive trace gases are quickly oxidized below an altitude of 700 m. The total OH reactivity profile has a rapid decay in the lower part of troposphere from surface to the lowest altitude (700 m) sampled by the NASA DC-8. The decay rate is close to that of very reactive biogenic volatile organic compounds such as monoterpenes. Therefore, we argue that photochemical processes in the bottom of the boundary layer, below the typical altitude of aircraft sampling, should be thoroughly investigated to properly assess ozone and secondary aerosol formation.

中文翻译:

郊区森林在控制垂直微量气体和 OH 反应性分布中的作用——首尔大都市区的案例研究

我们展示了 2016 年 5 月至 2016 年 6 月韩美空气质量研究 (KORUS) 实地活动期间,通过 NASA DC-8 和地面站点的仪器观测到的痕量气体垂直剖面。我们关注首尔大都市区附近的地区和人为和自然排放源在当地光化学中发挥重要作用的周围环境。整合地面和空中观测是许多大气化学实地活动的主要研究目标。尽管机载平台通常旨在从近地表到自由对流层进行采样,但很难非常靠近地表飞行,尤其是在地形复杂或人口稠密的环境中。一项综合了与特定浓度足迹相关的地面和空中观测的详细分析表明,反应性痕量气体在 700 m 高度以下迅速被氧化。总 OH 反应性剖面在对流层下部从地表到 NASA DC-8 采样的最低高度(700 m)快速衰减。衰减率接近于非常活泼的生物挥发性有机化合物,例如单萜。因此,我们认为边界层底部的光化学过程,低于飞机采样的典型高度,应该进行彻底调查,以正确评估臭氧和二次气溶胶的形成。总 OH 反应性剖面在对流层下部从地表到 NASA DC-8 采样的最低高度(700 m)快速衰减。衰减率接近于非常活泼的生物挥发性有机化合物,例如单萜。因此,我们认为边界层底部的光化学过程,低于飞机采样的典型高度,应该进行彻底调查,以正确评估臭氧和二次气溶胶的形成。总 OH 反应性剖面在对流层下部从地表到 NASA DC-8 采样的最低高度(700 m)快速衰减。衰减率接近于非常活泼的生物挥发性有机化合物,例如单萜。因此,我们认为边界层底部的光化学过程,低于飞机采样的典型高度,应该进行彻底调查,以正确评估臭氧和二次气溶胶的形成。
更新日期:2020-09-28
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