Atmospheric hydrogen variations and traffic emissions at an urban site in Finland

Atmospheric hydrogen variations and traffic emissions at an urban site in Finland

Atmospheric hydrogen (H<sub>2</sub>) mixing ratios were observed over a one year period from summer 2007 to 2008 in Helsinki, Finland. Relatively stable background values of hydrogen were occasionally observed at the site, with minimum in October and maximum between March and May. High h...

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Main Authors: T. Aalto, M. Lallo, J. Hatakka, T. Laurila
Format: Article
Language:English
Published: Copernicus Publications 2009-10-01
Series:Atmospheric Chemistry and Physics
Online Access:http://www.atmos-chem-phys.net/9/7387/2009/acp-9-7387-2009.pdf
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spelling doaj-968975c4336a4d70bb62469d3c8482472020-11-24T22:25:06ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242009-10-019197387739610.5194/acp-9-7387-2009Atmospheric hydrogen variations and traffic emissions at an urban site in FinlandT. Aalto0M. Lallo1J. Hatakka2T. Laurila3Finnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, FinlandFinnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, FinlandFinnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, FinlandFinnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, FinlandAtmospheric hydrogen (H<sub>2</sub>) mixing ratios were observed over a one year period from summer 2007 to 2008 in Helsinki, Finland. Relatively stable background values of hydrogen were occasionally observed at the site, with minimum in October and maximum between March and May. High hydrogen mixing ratios occurred simultaneously with high carbon monoxide (CO) values and coincided with high traffic flow periods. Carbon monoxide and radon (<sup>222</sup>Rn) were continuously monitored at the same site and they were used in estimation of the hydrogen emissions from traffic. The morning rush hour slope of ΔH<sub>2</sub>/ΔCO was in average 0.43&plusmn;0.03 ppb (H<sub>2</sub>)/ppb (CO). After correction due to soil deposition of H<sub>2</sub> the slope was 0.49&plusmn;0.07 ppb (H<sub>2</sub>)/ppb (CO). Using this slope and CO emission statistics, a road traffic emission of about 260 t (H<sub>2</sub>)/year was estimated for Helsinki in 2007.http://www.atmos-chem-phys.net/9/7387/2009/acp-9-7387-2009.pdf
collection DOAJ
language English
format Article
sources DOAJ
author T. Aalto
M. Lallo
J. Hatakka
T. Laurila
spellingShingle T. Aalto
M. Lallo
J. Hatakka
T. Laurila
Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
Atmospheric Chemistry and Physics
author_facet T. Aalto
M. Lallo
J. Hatakka
T. Laurila
author_sort T. Aalto
title Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
title_short Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
title_full Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
title_fullStr Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
title_full_unstemmed Atmospheric hydrogen variations and traffic emissions at an urban site in Finland
title_sort atmospheric hydrogen variations and traffic emissions at an urban site in finland
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2009-10-01
description Atmospheric hydrogen (H<sub>2</sub>) mixing ratios were observed over a one year period from summer 2007 to 2008 in Helsinki, Finland. Relatively stable background values of hydrogen were occasionally observed at the site, with minimum in October and maximum between March and May. High hydrogen mixing ratios occurred simultaneously with high carbon monoxide (CO) values and coincided with high traffic flow periods. Carbon monoxide and radon (<sup>222</sup>Rn) were continuously monitored at the same site and they were used in estimation of the hydrogen emissions from traffic. The morning rush hour slope of ΔH<sub>2</sub>/ΔCO was in average 0.43&plusmn;0.03 ppb (H<sub>2</sub>)/ppb (CO). After correction due to soil deposition of H<sub>2</sub> the slope was 0.49&plusmn;0.07 ppb (H<sub>2</sub>)/ppb (CO). Using this slope and CO emission statistics, a road traffic emission of about 260 t (H<sub>2</sub>)/year was estimated for Helsinki in 2007.
url http://www.atmos-chem-phys.net/9/7387/2009/acp-9-7387-2009.pdf
work_keys_str_mv AT taalto atmospherichydrogenvariationsandtrafficemissionsatanurbansiteinfinland
AT mlallo atmospherichydrogenvariationsandtrafficemissionsatanurbansiteinfinland
AT jhatakka atmospherichydrogenvariationsandtrafficemissionsatanurbansiteinfinland
AT tlaurila atmospherichydrogenvariationsandtrafficemissionsatanurbansiteinfinland
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