Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere
We present two Differential Optical Absorption Spectroscopy (DOAS) instruments built at RIVM: the RIVM DOAS and the miniDOAS. Both instruments provide virtually interference-free measurements of NH3 concentrations in the atmosphere, since they measure over an open path, without suffering from inlet problems or interference problems by ammonium aerosols dissociating on tubes or filters. They measure concentrations up to at least 200 mu g m(-3), have a fast response, low maintenance demands, and a high up-time. The RIVM DOAS has a high accuracy of typically 0.15 mu g m(-3) for ammonia for 5-min averages and over a total light path of 100 m. The miniDOAS has been developed for application in measurement networks such as the Dutch National Air Quality Monitoring Network (LML). Compared to the RIVM DOAS it has a similar accuracy, but is significantly reduced in size, costs, and handling complexity. The RIVM DOAS and miniDOAS results showed excellent agreement (R-2 = 0.996) during a field measurement campaign in Vredepeel, the Netherlands. This measurement site is located in an agricultural area and is characterized by highly variable, but on average high ammonia concentrations in the air. The RIVM-DOAS and miniDOAS results were compared to the results of the AMOR instrument, a continuous-flow wet denuder system, which is currently used in the LML. Averaged over longer time spans of typically a day, the (mini) DOAS and AMOR results agree reasonably well, although an off-set of the AMOR values compared to the (mini) DOAS results exists. On short time scales, the (mini) DOAS shows a faster response and does not show the memory effects due to inlet tubing and transport of absorption fluids encountered by the AMOR. Due to its high accuracy, high uptime, low maintenance and its open path, the (mini) DOAS shows a good potential for flux measurements by using two (or more) systems in a gradient set-up and applying the aerodynamic gradient technique.
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Subjects: | cross-sections, fluxes, herzberg continuum, nh3, nm, region, so2, spectrum, temperature, ultraviolet, |
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dig-wur-nl-wurpubs-4415012024-06-25 Volten, H. Bergwerff, J.B. Haaima, M. Lolkema, D.E. Berkhout, A.J.C. Hoff, G.R. Potma, C.J.M. Wichink Kruit, R.J. van Pul, W.A.J. Swart, D.P.J. Article/Letter to editor Atmospheric Measurement Techniques 5 (2012) 2 ISSN: 1867-1381 Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere 2012 We present two Differential Optical Absorption Spectroscopy (DOAS) instruments built at RIVM: the RIVM DOAS and the miniDOAS. Both instruments provide virtually interference-free measurements of NH3 concentrations in the atmosphere, since they measure over an open path, without suffering from inlet problems or interference problems by ammonium aerosols dissociating on tubes or filters. They measure concentrations up to at least 200 mu g m(-3), have a fast response, low maintenance demands, and a high up-time. The RIVM DOAS has a high accuracy of typically 0.15 mu g m(-3) for ammonia for 5-min averages and over a total light path of 100 m. The miniDOAS has been developed for application in measurement networks such as the Dutch National Air Quality Monitoring Network (LML). Compared to the RIVM DOAS it has a similar accuracy, but is significantly reduced in size, costs, and handling complexity. The RIVM DOAS and miniDOAS results showed excellent agreement (R-2 = 0.996) during a field measurement campaign in Vredepeel, the Netherlands. This measurement site is located in an agricultural area and is characterized by highly variable, but on average high ammonia concentrations in the air. The RIVM-DOAS and miniDOAS results were compared to the results of the AMOR instrument, a continuous-flow wet denuder system, which is currently used in the LML. Averaged over longer time spans of typically a day, the (mini) DOAS and AMOR results agree reasonably well, although an off-set of the AMOR values compared to the (mini) DOAS results exists. On short time scales, the (mini) DOAS shows a faster response and does not show the memory effects due to inlet tubing and transport of absorption fluids encountered by the AMOR. Due to its high accuracy, high uptime, low maintenance and its open path, the (mini) DOAS shows a good potential for flux measurements by using two (or more) systems in a gradient set-up and applying the aerodynamic gradient technique. en application/pdf https://research.wur.nl/en/publications/two-instruments-based-on-differential-optical-absorption-spectros 10.5194/amt-5-413-2012 https://edepot.wur.nl/265271 cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet Wageningen University & Research |
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cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet |
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cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet Volten, H. Bergwerff, J.B. Haaima, M. Lolkema, D.E. Berkhout, A.J.C. Hoff, G.R. Potma, C.J.M. Wichink Kruit, R.J. van Pul, W.A.J. Swart, D.P.J. Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
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We present two Differential Optical Absorption Spectroscopy (DOAS) instruments built at RIVM: the RIVM DOAS and the miniDOAS. Both instruments provide virtually interference-free measurements of NH3 concentrations in the atmosphere, since they measure over an open path, without suffering from inlet problems or interference problems by ammonium aerosols dissociating on tubes or filters. They measure concentrations up to at least 200 mu g m(-3), have a fast response, low maintenance demands, and a high up-time. The RIVM DOAS has a high accuracy of typically 0.15 mu g m(-3) for ammonia for 5-min averages and over a total light path of 100 m. The miniDOAS has been developed for application in measurement networks such as the Dutch National Air Quality Monitoring Network (LML). Compared to the RIVM DOAS it has a similar accuracy, but is significantly reduced in size, costs, and handling complexity. The RIVM DOAS and miniDOAS results showed excellent agreement (R-2 = 0.996) during a field measurement campaign in Vredepeel, the Netherlands. This measurement site is located in an agricultural area and is characterized by highly variable, but on average high ammonia concentrations in the air. The RIVM-DOAS and miniDOAS results were compared to the results of the AMOR instrument, a continuous-flow wet denuder system, which is currently used in the LML. Averaged over longer time spans of typically a day, the (mini) DOAS and AMOR results agree reasonably well, although an off-set of the AMOR values compared to the (mini) DOAS results exists. On short time scales, the (mini) DOAS shows a faster response and does not show the memory effects due to inlet tubing and transport of absorption fluids encountered by the AMOR. Due to its high accuracy, high uptime, low maintenance and its open path, the (mini) DOAS shows a good potential for flux measurements by using two (or more) systems in a gradient set-up and applying the aerodynamic gradient technique. |
format |
Article/Letter to editor |
topic_facet |
cross-sections fluxes herzberg continuum nh3 nm region so2 spectrum temperature ultraviolet |
author |
Volten, H. Bergwerff, J.B. Haaima, M. Lolkema, D.E. Berkhout, A.J.C. Hoff, G.R. Potma, C.J.M. Wichink Kruit, R.J. van Pul, W.A.J. Swart, D.P.J. |
author_facet |
Volten, H. Bergwerff, J.B. Haaima, M. Lolkema, D.E. Berkhout, A.J.C. Hoff, G.R. Potma, C.J.M. Wichink Kruit, R.J. van Pul, W.A.J. Swart, D.P.J. |
author_sort |
Volten, H. |
title |
Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
title_short |
Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
title_full |
Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
title_fullStr |
Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
title_full_unstemmed |
Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere |
title_sort |
two instruments based on differential optical absorption spectroscopy (doas) to measure accurate ammonia concentrations in the atmosphere |
url |
https://research.wur.nl/en/publications/two-instruments-based-on-differential-optical-absorption-spectros |
work_keys_str_mv |
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