H(2) Vertical profiles in the continental boundary layer: measurements at the Cabauw tall tower in the Netherlands

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dc.contributor.authorPopa, MEen_AU
dc.contributor.authorVermeulen, ATen_AU
dc.contributor.authorvan den Bulk, WCMen_AU
dc.contributor.authorJongejan, PACen_AU
dc.contributor.authorBatenburg, AMen_AU
dc.contributor.authorZahorowski, Wen_AU
dc.contributor.authorRöckmann, Ten_AU
dc.date.accessioned2011-12-13T23:24:58Zen_AU
dc.date.available2011-12-13T23:24:58Zen_AU
dc.date.issued2011-07-01en_AU
dc.date.statistics2011-12-14en_AU
dc.description.abstractIn-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) x10(-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. © Author(s) 2011.en_AU
dc.identifier.citationPopa, M.E., Vermeulen, A.T., van den Bulk, W.C.M., Jongejan, P.A.C., Batenburg, A.M., Zahorowski, W., & Röckmann, T. (2011). H(2) vertical profiles in the continental boundary layer: measurements at the Cabauw tall tower in The Netherlands. Atmospheric Chemistry and Physics, 11(13), 6425-6443. doi:10.5194/acp-11-6425-2011en_AU
dc.identifier.govdoc3681en_AU
dc.identifier.issn1680-7316en_AU
dc.identifier.issue13en_AU
dc.identifier.journaltitleAtmospheric Chemistry and Physicsen_AU
dc.identifier.pagination6425-6443en_AU
dc.identifier.urihttp://dx.doi.org/10.5194/acp-11-6425-2011en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3945en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Gesellschaft MBHen_AU
dc.subjectNetherlandsen_AU
dc.subjectHydrogenen_AU
dc.subjectCarbon monoxideen_AU
dc.subjectEuropeen_AU
dc.subjectBoundary layersen_AU
dc.subjectUrban areasen_AU
dc.titleH(2) Vertical profiles in the continental boundary layer: measurements at the Cabauw tall tower in the Netherlandsen_AU
dc.typeJournal Articleen_AU
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