Estimation of the molecular hydrogen soil uptake and traffic emissions at a suburban site near Paris through hydrogen, carbon monoxide, and radon‐222 semicontinuous measurements
Estimation of the molecular hydrogen soil uptake and traffic emissions at a suburban site near Paris through hydrogen, carbon monoxide, and radon‐222 semicontinuous measurements
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通过氢、一氧化碳和氡气-222 半连续测量估算巴黎附近郊区的分子氢土壤吸收量和交通排放
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发表时间：
2009
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通讯作者：
M. Ramonet
中科院分区：
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作者：
C. Yver;M. Schmidt;P. Bousquet;W. Zahorowski;M. Ramonet
自2006年6月以来，对流层分子氢（H2）、一氧化碳（CO）和氡-222 （222Rn）的同步半连续测量在法国郊区的大气测量站点Gif-sur-Yvette（巴黎地区）进行。分子氢的混合比在500到1000 ppb之间，CO的混合比在100到1400 ppb之间，222Rn的浓度在0到20 Bq m−3之间波动。北半球H2季节周期表现出春季最大值和秋季最小值的预期模式。我们推断平均基线值为533 ppb，峰对峰振幅为30 ppb。一氧化碳呈季节性循环，冬季最大值，夏季最小。平均基线值达到132 ppb，峰对峰振幅为40 ppb。氡-222季节性变化较弱，秋/冬最大，春/夏最小。H2和CO的日循环以附近交通的排放为主，在早高峰和晚高峰时段出现两个峰值。典型的H2/CO排放比为0.47±0.08 （ppb/ppb）。采用氡示踪法进行夜间H2观测，估算采样点夜间集水区土壤H2吸收量。通过平行测量CO浓度0.14 × 10−5 g(H2) m−2 h−1，估算了夜间局部人为燃烧源的影响。推断的干沉积平均速度为0.024±0.013 cm s - 1，在Gif-sur-Yvette的季节振幅为40%。
[1] Since June 2006, simultaneous semicontinuous measurements of tropospheric molecular hydrogen (H2), carbon monoxide (CO), and radon-222 (222Rn) have been performed at Gif-sur-Yvette (Paris region), a suburban atmospheric measurement site in France. Molecular hydrogen mixing ratios range from 500 to 1000 ppb, CO mixing ratios vary from 100 to 1400 ppb, and 222Rn concentrations fluctuate from 0 to 20 Bq m−3. The H2 seasonal cycle shows the expected pattern for the Northern Hemisphere with a maximum in spring and a minimum in autumn. We inferred a mean baseline value of 533 ppb with a peak-to-peak amplitude of 30 ppb. Carbon monoxide exhibits a seasonal cycle with a maximum in winter and a minimum in summer. The mean baseline value reaches 132 ppb with a peak-to-peak amplitude of 40 ppb. Radon-222 presents weak seasonal variations with a maximum in autumn/winter and a minimum in spring/summer. The diurnal cycles of H2 and CO are dominated by emissions from nearby traffic with two peaks during morning and evening rush hours. The typical H2/CO emission ratio from traffic is found to be 0.47 ± 0.08 on a molar basis (ppb/ppb). The radon tracer method is applied to nighttime H2 observations to estimate the H2 soil uptake of the nocturnal catchment area of our sampling site. The influences from nocturnal local anthropogenic combustion sources are estimated by parallel measurements of CO at 0.14 × 10−5 g(H2) m−2 h−1. The mean inferred dry deposition velocity is 0.024 ± 0.013 cm s−1 with a seasonal amplitude of 40% at Gif-sur-Yvette.