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首页> 外文期刊>Atmospheric chemistry and physics >PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest
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PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest

机译：PTR-TOF-MS EADDY协调性的异戊二烯和东部亚马逊雨林的单戊二醛助核

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Biogenic volatile organic compounds (BVOCs) are important components of the atmosphere due to their contribution to atmospheric chemistry and biogeochemical cycles. Tropical forests are the largest source of the dominant BVOC emissions (e.g. isoprene and monoterpenes). In this study, we report isoprene and total monoterpene flux measurements with a proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) using the eddy covariance (EC) method at the Tapajós National Forest (2.857° S, 54.959° W), a primary rainforest in eastern Amazonia. Measurements were carried out from 1 to 16?June?2014, during the wet-to-dry transition season. During the measurement period, the measured daytime (06:00–18:00 LT) average isoprene mixing ratios and fluxes were 1.15±0.60 ppb and 0.55±0.71 mg C m?2 h?1, respectively, whereas the measured daytime average total monoterpene mixing ratios and fluxes were 0.14±0.10 ppb and 0.20±0.25 mg C m?2 h?1, respectively. Midday (10:00–14:00 LT) average isoprene and total monoterpene mixing ratios were 1.70±0.49 and 0.24±0.05 ppb, respectively, whereas midday average isoprene and monoterpene fluxes were 1.24±0.68 and 0.46±0.22 mg C m?2 h?1, respectively. Isoprene and total monoterpene emissions in Tapajós were correlated with ambient temperature and solar radiation. Significant correlation with sensible heat flux, SHF (r2=0.77), was also observed. Measured isoprene and monoterpene fluxes were strongly correlated with each other (r2=0.93). The MEGAN2.1 (Model of Emissions of Gases and Aerosols from Nature version 2.1) model could simulate most of the observed diurnal variations (r2=0.7 to 0.8) but declined a little later in the evening for both isoprene and total monoterpene fluxes. The results also demonstrate the importance of site-specific vegetation emission factors (EFs) for accurately simulating BVOC fluxes in regional and global BVOC emission models.
机译：由于它们对大气化学和生物地球化学循环的贡献，生物挥发性有机化合物（BVOCs）是大气的重要组成部分。热带森林是主要的BVOC排放最大来源（例如，异戊二烯和单调）。在这项研究中，我们在Tapajós国家森林（2.857°S，54.959，使用涡流转移反应飞行时间质谱仪（PTR-TOF-MS）报告异戊二烯和总单萜丝通量测量。 °W），亚马东东部的主要雨林。测量从1到16岁以下？2014年6月？2014年，在潮湿的过渡季节。在测量期间，测量的白昼（06：00-18：00 LT）平均异戊二烯混合比和助熔剂分别为1.15±0.60ppb和0.55±0.71mg Cm≤2h≤1，而测量的白天平均值单萜混合比和助熔剂分别为0.14±0.10ppb和0.20±0.25mg C m 2 H 2 H 2 H 2。中午（10：00-14：00 Lt）平均异戊二烯和总单萜混合比分别为1.70±0.49和0.24±0.05ppb，而午间平均异戊二烯和单萜通量为1.24±0.68和0.46±0.22 mg C m？2 H？1分别。塔帕霍斯的异戊二烯和总单萜排放与环境温度和太阳辐射相关。还观察到与显热通量的显着相关性，SHF（R2 = 0.77）。测得的异戊二烯和单萜通量彼此强烈地相关（R2 = 0.93）。 Megan2.1（来自自然版本2.1的气体排放和气溶胶的型号）模型可以模拟大部分观察到的昼夜变化（R2 = 0.7至0.8），但晚上稍后均为异戊二烯和总单萜通量。结果还证明了特定于现场植被排放因子（EFS）的重要性，以便在区域和全球BVOC排放模型中准确地模拟BVOC助熔剂。

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