Measurements of molecular hydrogen and carbon monoxide on the Trainou tall tower
Measurements of molecular hydrogen and carbon monoxide on the Trainou tall tower
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在 Trainou 高塔上测量分子氢和一氧化碳
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发表时间：
2011
期刊：
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通讯作者：
M. Ramonet
中科院分区：
文献类型：
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作者：
Camille Yver;M. Schmidt;P. Bousquet;M. Ramonet
本文介绍了2008年10月至2010年9月在法国Trainou高塔（47.96°N，02.11°E，131 masl，采样高度：50，100和180 m）采样的分子氢（H2）和一氧化碳（CO）的2年原位测量结果。2009年5月增加了氡-222（222 Rn）测量。背景的季节性周期，下午值的基础上，表现出45和60 ppb的H2和CO的振幅，分别为三个不同的高度（50，100和180米以上的地面）。垂直梯度也表现出季节性变化与最大值（在夜间）的20和45 ppb的H2和CO，分别。我们还观察到的日周期为H2和CO的三个不同的高度。下午，三个不同高度的混合比相似，与海洋背景站，如梅斯黑德（爱尔兰）。222 Rn的日变化与边界层高度变化一致，最大值出现在早晨。全年，特别是在夏季和秋季，H2混合比显示夜间耗尽，最低值在06：00 UTC，由于土壤吸收和低边界层高度。用简单的箱形法和氡示踪法计算了Trainou集水区的H2沉降速度，发现H2沉降速度的平均值为2.6 ± 0.9 × 10 ~（-2）cm ~（-2）s ~（-1）。在冬季，H2和CO有时强烈相关，导致H2/CO比约为0.25。这一比例低于交通排放的比例，从而突出了这一领域各种来源的混合。
We present 2 yr (October 2008 to September 2010) of in situ measurements of molecular hydrogen (H2) and carbon monoxide (CO) sampled at the tall tower of Trainou, France (47.96°N, 02.11°E, 131 masl, sampling height: 50, 100 and 180 m). Radon-222 (222Rn) measurements were added in May 2009. Background seasonal cycles, based on afternoon values, exhibit an amplitude of 45 and 60 ppb for H2 and CO, respectively, for the three different heights (50, 100 and 180 m above ground). The vertical gradient also shows seasonal variations with a maximum (during the night) of 20 and 45 ppb for H2 and CO, respectively.We also observe diurnal cycles for H2 and CO for the three different heights. In the afternoon, the mixing ratios at the three different heights are similar and are comparable with maritime background stations, such as Mace Head (Ireland). The diurnal cycle of 222Rn follows the boundary layer height variations, with maximum values in the morning. Throughout the year but especially in summer and autumn, the H2 mixing ratio shows nighttime depletion, with the lowest values at 06:00 UTC, due to soil uptake and the low boundary layer height. Using a simple box approach and the Radon-Tracer-Method, the H2 deposition velocity is calculated for the catchment area of Trainou.We find a mean value for the H2 deposition velocity of 2.6 ± 0.9 10-2 cm-2 s-1. During wintertime, H2 and CO are sometimes strongly correlated leading to a H2/CO ratio around 0.25. This ratio is lower than the ratio from traffic emissions, thus highlighting the mixing of sources in this area.