The Measuring Ammonia in Nature (MAN) network in the Netherlands

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Abstract

Since 2005 the Measuring Ammonia in Nature (MAN) network monitors atmospheric ammonia concentrations in nature reserve areas in the Netherlands (http://man.rivm.nl). The main aim of the network is to monitor national trends, to assess regional deviations and to validate model calculations. Measurements are performed with commercial passive samplers, calibrated monthly against ammonia measurements of active sampling devices. The sampling is performed by an extensive group of local volunteers, which minimizes the cost and enables the use of local knowledge. We show the MAN network to be well capable of monitoring trends on national and local scales and providing data for more detailed local analyses. The quality of the network is such that trends over time for individual MAN areas can be detected on the order of 3 % per year for time series of 6-9 years.

Figures

  • Figure 2. The ammonia passive sampler from Gradko, as exploited in the MAN network.
  • Figure 1. The MAN network in 2014.
  • Figure 3. Example of the monthly calibration for the month of May in 2007. Displayed is the LML / MAN ratio against the MAN data. The black line gives the regression. The red line indicates that the correction factor for a measured value of 15 µg m−3 ammonia is 0.9 for the month of May in 2007.
  • Figure 4. Calibration parameters a and b and the deviance of the fit for the period from March 2005 (top)/March 2007 (bottom) to January 2013.
  • Table 1. Typical effective calibration factors.
  • Figure 5. Frequency analysis of calibration parameters a and b. Calibration parameter a shows a distinct periodicity of 1 year, indicated with the arrow in the top right panel. Note the different y scales for the different panels.
  • Figure 6. Example 1 of calibration effect on the data.
  • Figure 7. Example 2 of calibration effect on the data.

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CITATION STYLE

APA

Lolkema, D. E., Noordijk, H., Stolk, A. P., Hoogerbrugge, R., Van Zanten, M. C., & Van Pul, W. A. J. (2015). The Measuring Ammonia in Nature (MAN) network in the Netherlands. Biogeosciences, 12(16), 5133–5142. https://doi.org/10.5194/bg-12-5133-2015

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