Estimated variability of National Atmospheric Deposition Program/Mercury Deposition Network measurements using collocated samplers

Gregory A. Wetherbee, David A. Gay, Robert C. Brunette, Clyde W. Sweet

Research output: Contribution to journalArticlepeer-review

Abstract

The National Atmospheric Deposition Program/Mercury Deposition Network (MDN) provides long-term, quality-assured records of mercury in wet deposition in the USA and Canada. Interpretation of spatial and temporal trends in the MDN data requires quantification of the variability of the MDN measurements. Variability is quantified for MDN data from collocated samplers at MDN sites in two states, one in Illinois and one in Washington. Median absolute differences in the collocated sampler data for total mercury concentration are approximately 11% of the median mercury concentration for all valid 1999-2004 MDN data. Median absolute differences are between 3.0% and 14% of the median MDN value for collector catch (sample volume) and between 6.0% and 15% of the median MDN value for mercury wet deposition. The overall measurement errors are sufficiently low to resolve between NADP/MDN measurements by ±2 ng·l-1 and ±2 μ·m-2· year-1, which are the contour intervals used to display the data on NADP isopleths maps for concentration and deposition, respectively.

Original languageEnglish (US)
Pages (from-to)49-69
Number of pages21
JournalEnvironmental Monitoring and Assessment
Volume131
Issue number1-3
DOIs
StatePublished - Aug 2007

Keywords

  • MDN
  • Mercury
  • NADP
  • Precipitation
  • Quality assurance
  • Variability
  • Wet deposition

ASJC Scopus subject areas

  • Environmental Science(all)
  • Pollution
  • Management, Monitoring, Policy and Law

Fingerprint Dive into the research topics of 'Estimated variability of National Atmospheric Deposition Program/Mercury Deposition Network measurements using collocated samplers'. Together they form a unique fingerprint.

Cite this