Total OH reactivity measurements in ambient air in a southern Rocky mountain ponderosa pine forest during BEACHON-SRM08 summer campaign
Total OH reactivity measurements in ambient air in a southern Rocky mountain ponderosa pine forest during BEACHON-SRM08 summer campaign
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DOI：
10.1016/j.atmosenv.2013.11.042
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发表时间：
2014-03
影响因子：
5
通讯作者：
Yoshihiro Nakashima;Shungo Kato;J. Greenberg;P. Harley;T. Karl;A. Turnipseed;E. Apel;A. Guenther;J. Smith;Y. Kajii
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文献类型：
--
作者：
Yoshihiro Nakashima;Shungo Kato;J. Greenberg;P. Harley;T. Karl;A. Turnipseed;E. Apel;A. Guenther;J. Smith;Y. Kajii
2008年8月，在美国科罗拉多州马尼托实验森林（MEF）举行的南落基山2008年野外活动（BEACHON-SRM08）中，对能量、气溶胶、碳、水、有机物和氮的生物-水-大气相互作用进行了OH总反应性的测量。平均总OH反应度为6.7 s−1，低于同一季节东京市区（33.4 s−1，吉野等人，2012）和郊区（27.7 s−1，吉野等人，2006）的测量值，但在某些晚上也观察到偶尔的高OH反应度。总OH反应性测量伴随着CO、NO、NOy、o3、so2和挥发性有机化合物（VOCs）等痕量物质的观测。通过对这些痕量物种的分析，计算了VOCs的OH反应活性，46.3%的VOCs OH反应活性来自以2-甲基-3-丁烯-2-醇（MBO）和单萜烯为主的生物源物种。MBO对各痕量物质OH反应性的贡献最大。对实测和计算的OH反应度进行比较，结果表明，计算的OH反应度比观测值低29.5%，表明存在缺失的OH汇。缺失OH的候选物之一被认为是生物源物种的氧化产物。
Total OH reactivity was measured during the Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics and Nitrogen-Southern Rocky Mountain 2008 field campaign (BEACHON-SRM08) held at Manitou Experimental Forest (MEF) in Colorado USA in August, 2008. The averaged total OH reactivity was 6.7 s−1, smaller than that measured in urban (33.4 s−1, Yoshino et al., 2012) and suburban (27.7 s−1, Yoshino et al., 2006) areas in Tokyo in the same season, while sporadically high OH reactivity was also observed during some evenings. The total OH reactivity measurements were accompanied by observations of traces species such as CO, NO, NOy, O3and SO2and Volatile Organic Compounds (VOCs). From the calculation of OH reactivity based on the analysis of these trace species, 46.3% of OH reactivity for VOCs came from biogenic species that are dominated by 2-methyl-3-buten-2-ol (MBO), and monoterpenes. MBO was the most prominent contribution to OH reactivity of all trace species. A comparison of observed and calculated OH reactivity shows that the calculated OH reactivity is 29.5% less than the observed value, implying the existence of missing OH sinks. One of the candidates of missing OH is thought to be the oxidation products of biogenic species.