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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Influence of biotic exchange and combustion sources on atmospheric CO_2 concentrations in New England from observations at a forest flux tower
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Influence of biotic exchange and combustion sources on atmospheric CO_2 concentrations in New England from observations at a forest flux tower

机译：从森林通量塔观察，生物交换和燃烧源对新英格兰大气CO_2浓度的影响

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摘要

Hourly data for concentrations and fluxes of CO_2 at 30 m in Harvard Forest (Petersham, Massachusetts) are analyzed using linear modeling to obtain regionally representative CO_2 concentrations at a continental site. The time series is decomposed into contributions due to regional combustion, local canopy exchange, monthly average regional biotic exchange (as modulated by the daily cycle of growth and decay of the planetary boundary layer (PBL)), and the regional monthly background concentration. Attributions are derived using time series analysis, data for a tracer for combustion (CO or acetylene (C_2H_2)), and measurements of indicators of proximate canopy exchange (CO_2 flux and momentum flux). Results are compared to observations at Cold Bay, Alaska. Combustion contributes on average 4-5 ppm to ambient CO_2 at Harvard Forest in winter and 2-3 ppm in summer. Regional biotic emissions elevate daily mean CO_2 by 4-6 ppm in winter, and the covariance of the biotic cycle of uptake and emission with PBL height enhances daily mean CO_2 by 1-2 ppm in summer; minimum values in later afternoon average 10 ppm lower than at Cold Bay in summer. The study shows that regionally representative concentrations of CO_2 can be determined at continental sites if suitable correlates (tracers, fluxes of CO_2, and momentum) are measured simultaneously with CO_2 itself.
机译：使用线性模型分析哈佛森林（马萨诸塞州彼得舍姆）30 m处CO_2浓度和通量的每小时数据，以获取大陆站点上具有区域代表性的CO_2浓度。由于区域燃烧，局部林冠交换，每月平均区域生物交换（受行星边界层（PBL）的生长和衰减的每日周期调节）和区域每月背景浓度，时间序列被分解为贡献。使用时间序列分析，燃烧示踪剂的数据（CO或乙炔（C_2H_2））以及邻近冠层交换指标（CO_2通量和动量通量）的测量值来得出属性。将结果与阿拉斯加冷湾的观测结果进行比较。冬季，燃烧对哈佛森林的平均CO_2贡献为4-5 ppm，而夏季则为2-3 ppm。冬季，区域性生物排放将每日平均CO_2提高4-6 ppm，而生物摄取和排放的生物周期与PBL高度的协方差在夏季将每日平均CO_2增加1-2 ppm。下午晚些时候的最低值比夏天的冷湾平均低10 ppm。研究表明，如果与CO_2本身同时测量合适的相关性（示踪剂，CO_2通量和动量），则可以在大陆站点确定具有代表性的CO_2浓度。

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