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A year of H[subscript 2] measurements at Weybourne Atmospheric Observatory, UK

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journal contribution
posted on 28.02.2014, 14:05 by G. L. Forster, W. T. Sturges, Zoe L. Fleming, B. J. Bandy, S. Emeis
We present a year-long high precision time series of atmospheric molecular hydrogen (H[subscript 2]) measured at the UK North Sea coast from March 2008 to February 2009. We observed a pronounced seasonal cycle in H[subscript 2] with mean values in late winter/early spring ~40 ppb higher than those in late summer/early autumn. Background-subtracted molar H[subscript 2]/CO ratios (ΔH[subscript 2]/ΔCO) averaged 0.35±0.002 for all data combined and 0.25±0.002 when ΔH[subscript 2] was above 10 ppb. The ΔH[subscript 2]/ΔCO ratio was highest in summer, possibly as a result of larger photochemical production. Using simultaneous measurements of ozone, we estimated the deposition velocity of H[subscript 2] during nocturnal inversion events to average 3.5±0.7x10[superscript -4]m s[superscript -1] for June 2008 and 1.9±1x10[superscript -4]m s[superscript -1] for July 2008, in good agreement with other reported estimates. In May 2008, we observed an episode of exceptionally clean air being transported from the tropics but arriving from the north, in which H[subscript 2] was slightly elevated indicating minimal surface loss. On another occasion with south-easterly winds, we believe we detected emissions from H[subscript 2] production facilities in the near-continent characterised by H[subscript 2] mixing ratios reaching 1450 ppb.

History

Citation

Tellus B, 2012, 64, 17771

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

VoR (Version of Record)

Published in

Tellus B

Publisher

Co-Action Publishing for International Meteorological Institute in Stockholm

issn

0280-6509

eissn

1600-0889

Copyright date

2012

Available date

28/02/2014

Publisher version

http://www.tellusb.net/index.php/tellusb/article/view/17771

Language

en

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