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Development of a low-cost system for measuring conditional time-averaged gradients of SO2 and NH3

Famulari, D.; Fowler, D.; Nemitz, E.; Hargreaves, K.J.; Storeton-West, R.L.; Rutherford, G.; Tang, Y.S.; Sutton, M.A.; Weston, K.J.. 2010 Development of a low-cost system for measuring conditional time-averaged gradients of SO2 and NH3. Environmental Monitoring and Assessment, 161. 11-27. 10.1007/s10661-008-0723-6

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Abstract/Summary

A conditional time-averaged gradient (COTAG) system has been developed to provide direct long-term (weekly to monthly) average flux gradient measurements for a range of trace gases, between land and atmosphere. Over daily periods, atmospheric conditions can range from high stability, where the vertical gradients of ambient concentration are enhanced due to very small diffusivity, to highly unstable conditions, in which concentration gradients are small due to the intense turbulent activity of the surface layer. The large vertical gradients generated by high stability would bias the estimate of the actual flux: to avoid this, the COTAG system samples conditionally, within a carefully refined range of stability. A comparison with a continuous flux gradient system suggested that the removal of stable conditions from the sampling period does not substantially modify the evaluation of the long-term fluxes

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s10661-008-0723-6
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.4 - Develop innovative, effective methods for monitoring fluxes, exposure and effects
CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett
ISSN: 0167-6369
Additional Keywords: COTAG, conditional sampling, deposition fluxes, low-cost deposition monitoring, NH3, SO2
NORA Subject Terms: Meteorology and Climatology
Physics
Ecology and Environment
Atmospheric Sciences
Date made live: 07 Jul 2010 08:32
URI: http://nora.nerc.ac.uk/id/eprint/10094

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