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H-2 vertical profiles in the continental boundary layer : measurements at the Cabauw tall tower in The Netherlands

Popa, M. E.; Vermeulen, Alex LU ; van den Bulk, W. C. M.; Jongejan, P. A. C.; Batenburg, A. M.; Zahorowski, W. and Rockmann, T. (2011) In Atmospheric Chemistry and Physics 11(13). p.6425-6443
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. Rn-222 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... (More)
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. Rn-222 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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
11
issue
13
pages
6425 - 6443
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000292728400018
  • scopus:79960157257
ISSN
1680-7324
DOI
10.5194/acp-11-6425-2011
language
English
LU publication?
no
id
85802f9f-60f5-40c5-a652-5dd44e859f27 (old id 4623839)
date added to LUP
2014-10-14 14:46:11
date last changed
2017-04-23 03:18:19
@article{85802f9f-60f5-40c5-a652-5dd44e859f27,
  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. Rn-222 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       = {Popa, M. E. and Vermeulen, Alex and van den Bulk, W. C. M. and Jongejan, P. A. C. and Batenburg, A. M. and Zahorowski, W. and Rockmann, T.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {13},
  pages        = {6425--6443},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {H-2 vertical profiles in the continental boundary layer : measurements at the Cabauw tall tower in The Netherlands},
  url          = {http://dx.doi.org/10.5194/acp-11-6425-2011},
  volume       = {11},
  year         = {2011},
}