Observations of molecular hydrogen mixing ratio and stable isotopic composition at the Cabauw tall tower in the Netherlands
Observations of molecular hydrogen mixing ratio and stable isotopic composition at the Cabauw tall tower in the Netherlands
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荷兰 Cabauw 高塔观测氢分子混合比和稳定同位素组成
DOI:
10.1016/j.atmosenv.2016.09.058
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发表时间:
2016
影响因子:
5
通讯作者:
Batenburg A
中科院分区:
文献类型:
--
作者:
Batenburg A
Measurements of the stable isotopic composition (δD(H2) orδD) of atmospheric molecular hydrogen (H2) are a useful addition to mixing ratio (χ(H2)) measurements for understanding the atmospheric H2cycle.δD datasets published so far consist mostly of observations at background locations. We complement these with observations from the Cabauw tall tower at the CESAR site, situated in a densely populated region of the Netherlands. Our measurements show a large anthropogenic influence on the local H2cycle, with frequently occurring pollution events that are characterized byχ(H2) values that reach up to ≈1 ppm and lowδD values. Anisotopic source signature analysisyields an apparent source signature below −400‰, which is much more D-depleted than the fossil fuel combustion source signature commonly used in H2budget studies. Two diurnal cycles that were sampled at a suburban site near London also show a more D-depleted source signature (≈−340‰), though not as extremely depleted as at Cabauw. The source signature of the Northwest European vehicle fleet may have shifted to somewhat lower values due to changes in vehicle technology and driving conditions. Even so, the surprisingly depleted apparent source signature at Cabauw requires additional explanation; microbial H2production seems the most likely cause. The Cabauw tower site also allowed us to samplevertical profiles. We found no decrease inχ(H2) at lower sampling levels (20 and 60 m) with respect to higher sampling levels (120 and 200 m). There was a significant shift to lower medianδD values at the lower levels. This confirms the limited role of soil uptake around Cabauw, and again points to microbial H2production during an extended growing season, as well as to possible differences in average fossil fuel combustion source signature between the different footprint areas of the sampling levels. So, although knowledge of the background cycle of H2has improved over the last decade, surprising features come to light when a non-background location is studied, revealing remaining gaps in our understanding.
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DOI:
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发表时间:
2009
期刊:
影响因子:
--
作者:
S. Hammer;F. Vogel;M. Kaul;I. Levin
通讯作者:
I. Levin
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Camille Yver;M. Schmidt;P. Bousquet;M. Ramonet
通讯作者:
M. Ramonet
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
C. Yver;M. Schmidt;P. Bousquet;W. Zahorowski;M. Ramonet
通讯作者:
M. Ramonet
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
A. Rice;A. Dayalu;P. Quay;R. Gammon
通讯作者:
R. Gammon
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
M. Popa;A. Vermeulen;W. C. M. Bulk;P. Jongejan;A. Batenburg;W. Zahorowski;T. Röckmann
通讯作者:
T. Röckmann