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首页> 外文期刊>Atmospheric chemistry and physics >Summertime total OH reactivity measurements from boreal forest during HUMPPA-COPEC 2010
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Summertime total OH reactivity measurements from boreal forest during HUMPPA-COPEC 2010

机译：HUMPPA-COPEC 2010夏季北方森林的总OH反应性测量

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Ambient total OH reactivity was measured at the Finnish boreal forest station SMEAR II in Hyyti?l? (Latitude 61°51' N; Longitude 24°17' E) in July and August 2010 using the Comparative Reactivity Method (CRM). The CRM - total OH reactivity method - is a direct, in-situ determination of the total loss rate of hydroxyl radicals (OH) caused by all reactive species in air. During the intensive field campaign HUMPPA-COPEC 2010 (Hyyti?l? United Measurements of Photochemistry and Particles in Air - Comprehensive Organic Precursor Emission and Concentration study) the total OH reactivity was monitored both inside (18 m) and directly above the forest canopy (24 m) for the first time. The comparison between these two total OH reactivity measurements, absolute values and the temporal variation have been analyzed here. Stable boundary layer conditions during night and turbulent mixing in the daytime induced low and high short-term variability, respectively. The impact on total OH reactivity from biogenic emissions and associated photochemical products was measured under "normal" and "stressed" (i.e. prolonged high temperature) conditions. The advection of biomass burning emissions to the site caused a marked change in the total OH reactivity vertical profile. By comparing the OH reactivity contribution from individually measured compounds and the directly measured total OH reactivity, the size of any unaccounted for or "missing" sink can be deduced for various atmospheric influences. For "normal" boreal conditions a missing OH reactivity of 58%, whereas for "stressed" boreal conditions a missing OH reactivity of 89% was determined. Various sources of not quantified OH reactive species are proposed as possible explanation for the high missing OH reactivity.
机译：在Hyyti？l的芬兰北方森林森林站SMEAR II上测量环境总OH反应性。使用比较反应性方法（CRM）在2010年7月和8月（北纬61°51'N;经度24°17'E）。 CRM-总OH反应性方法-是直接，原位确定由空气中所有反应性物种引起的羟基自由基（OH）的总损失率的方法。在HUMPPA-COPEC 2010密集野外活动期间（Hyyti？l？空气中光化学和颗粒物的联合测量-有机前体排放和浓度综合研究），在林冠层内部（18 m）和林冠上方直接监测了总OH反应性（ 24 m）。此处已分析了这两个总OH反应性测量值，绝对值和时间变化之间的比较。夜间的稳定边界层条件和白天的湍流混合分别引起短期和短期短期波动性。在“正常”和“压力”（即延长的高温）条件下，测量了生物排放物和相关的光化学产品对总OH反应性的影响。生物质燃烧排放物对流的平流导致总OH反应性垂直分布发生明显变化。通过比较来自单独测量的化合物的OH反应性贡献和直接测量的总OH反应性，可以得出各种大气影响所导致的任何未解释或“缺失”的沉的大小。对于“正常”的北方条件，缺少的OH反应性为58％，而对于“紧张”的北方条件，则确定的OH缺乏反应性为89％。提出了多种未定量的OH反应性物种的来源，以解释高OH反应性的缺失。

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