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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Radiative forcing of phytogenic aerosols - art. no. 4466
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Radiative forcing of phytogenic aerosols - art. no. 4466

机译：植物气溶胶的辐射强迫-艺术。没有。 4466

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1] The principal objective of this study is to investigate the radiative influences produced by phytogenic aerosols over a forested area in eastern Canada where measured aerosol concentrations resulted from alpha-pinene and beta-pinene oxidation processes. The studied forest ecosystem produced moderate amounts of biogenic hydrocarbons, with isoprene and pinene mixing ratios reaching 1.6 parts per billion. Once oxidized, these pinene levels gave rise to maximum phytogenic aerosol concentrations of circa 5000 particles per cm(3). The amount of diffuse and attenuated solar irradiance resulting from the interaction of aerosols with incoming irradiance was quantified using a one-dimensional spectral radiative transfer model and measured aerosol sized distributions and concentrations. Results show that aerosols in the atmospheric boundary layer contributed to only moderate levels of diffuse irradiance but generated substantial attenuation of the incoming solar irradiance stream. For the irradiance levels measured in eastern Canada during cloudless days in July and with aerosol concentrations in the range of 2000 to 5000 particles per cm(3), average daytime solar irradiance attenuation amounted to 0.04 W m(-2) with a diffuse component of 0.01 W m(-2). The maximum solar irradiance extinction reached 0.2 W m(-2). Assuming a uniform spatial aerosol distribution, this negative radiative influence could offset substantial fractions of the regional thermal forcing resulting from increased levels of greenhouse gases such as carbon dioxide. It is concluded that greater radiative influences ( cooling) could be present over regions dominated by hydrocarbon productive forest ecosystems. [References: 60
机译：1]这项研究的主要目的是调查植物气溶胶对加拿大东部林区的辐射影响，该地区的测量气溶胶浓度是由α-pine烯和β-pine烯氧化过程产生的。所研究的森林生态系统产生了适量的生物烃，异戊二烯和pin烯的混合比达到1.6十亿分之一。一旦被氧化，这些pin烯的水平会导致最大的植物气溶胶浓度约为每厘米5000个颗粒（3）。使用一维光谱辐射转移模型量化了由气溶胶与入射辐照度相互作用产生的扩散和衰减的太阳辐照量，并测量了气溶胶尺寸分布和浓度。结果表明，大气边界层中的气溶胶仅对中等水平的漫射辐照做出了贡献，但对入射的太阳辐照流产生了明显的衰减。对于加拿大东部地区在7月无云的日子和气溶胶浓度范围为每厘米2000到5000个颗粒（3）的辐照度水平，日平均太阳辐照度衰减总计为0.04 W m（-2），且散射分量为0.01 W m（-2）。最大太阳辐射消光达到0.2 W m（-2）。假设空间气溶胶分布均匀，这种负面的辐射影响可能会抵消由温室气体（例如二氧化碳）水平升高导致的区域热强迫的大部分。结论是，在以碳氢化合物生产的森林生态系统为主的地区上可能存在更大的辐射影响（冷却）。 [参考：60

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