H-2 vertical profiles in the continental boundary layer : measurements at the Cabauw tall tower in The Netherlands
H-2 vertical profiles in the continental boundary layer : measurements at the Cabauw tall tower in The Netherlands
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大陆边界层的 H-2 垂直剖面：荷兰 Cabauw 高塔的测量
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. Röckmann
中科院分区：
文献类型：
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作者：
M. Popa;A. Vermeulen;W. C. M. Bulk;P. Jongejan;A. Batenburg;W. Zahorowski;T. Röckmann
抽象的。自2007年10月以来，在荷兰Cabauw高塔站进行了大气氢（H 2）的原位准连续测量。在距地面20 ~ 200 m的四个高度上连续采样，同时测定了H2、CO和几种温室气体的摩尔分数。在20和200 m处采样的空气中进行222 Rn测量。该H2数据集代表了第一个在低大陆边界层H2垂直剖面的原位、准连续长期测量系列。H2和CO在所有高度都存在季节性循环，其幅度随采样高度而变化。季节性是明显的，在“基线”值和短期（日天气时间尺度）的变化，后者在冬季显着较大。所观察到的H 2短期信号和垂直梯度在许多情况下与其他物种，特别是CO。另一方面，H 2有时具有独特的行为，由于其特定的源和汇的分布。我们使用氡示踪法估算的区域H2土壤吸收通量为（−1.89 ± 0.26）× 10 −5 g/（m2 h），明显小于欧洲最近的其他结果。根据我们的数据计算出的交通排放的H2/CO比，平均为0.54 ± 0.07mol：mol，比欧洲以前的一些研究中估计的更大，更易变。这种差异可以解释为不同的驾驶制度，由于在Cabauw的影响区域频繁的交通堵塞。大规模污染事件的H2/CO比值平均为0.36 ± 0.05mol：mol，随采样高度的增加，H2/CO比值略有增加，这可能是由于采样高度越低，土壤吸收的影响越大。
Abstract. In-situ, quasi-continuous measurements of atmospheric hydrogen (H 2 ) have been performed since October 2007 at the Cabauw tall tower station in the Netherlands. Mole fractions of H 2 , CO and several greenhouse gases are determined simultaneously in air sampled successively at four heights, between 20 and 200 m above ground level. 222 Rn measurements are performed in air sampled at 20 and 200 m. This H 2 dataset represents the first in-situ, quasi-continuous long-term measurement series of vertical profiles of H 2 in the lower continental boundary layer. Seasonal cycles are present at all heights in both H 2 and CO, and their amplitude varies with the sampling height. The seasonality is evident in both the "baseline" values and in the short term (diurnal to synoptic time scales) variability, the latter being significantly larger during winter. The observed H 2 short term signals and vertical gradients are in many cases well correlated to other species, especially to CO. On the other hand, H 2 has at times a unique behaviour, due to its particular distribution of sources and sinks. Our estimation for the regional H 2 soil uptake flux, using the radon tracer method, is (−1.89 ± 0.26) × 10 −5 g/(m 2 h), significantly smaller than other recent results from Europe. H 2 /CO ratios of the traffic emissions computed from our data, with an average of 0.54 ± 0.07 mol:mol, are larger and more variable than estimated in some of the previous studies in Europe. This difference can be explained by a different driving regime, due to the frequent traffic jams in the influence area of Cabauw. The H 2 /CO ratios of the large scale pollution events have an average of 0.36 ± 0.05 mol:mol; these ratios were observed to slightly increase with sampling height, possibly due to a stronger influence of soil uptake at the lower sampling heights.