Estimated Variability of National Atmospheric Deposition Program/Mercury Deposition Network Measurements Using Collocated Samplers
| Autor: | Gregory A. Wetherbee, David A. Gay, Robert C. Brunette, Clyde W. Sweet |
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| Rok vydání: | 2007 |
| Předmět: |
Washington
Hydrology Observational error Assurance qualite Rain Air pollution chemistry.chemical_element Mercury General Medicine Management Monitoring Policy and Law medicine.disease_cause Pollution Mercury (element) Sample volume Deposition (aerosol physics) chemistry medicine Environmental science Spatial variability Illinois Environmental Monitoring General Environmental Science Mercury deposition |
| Zdroj: | Environmental Monitoring and Assessment. 131:49-69 |
| ISSN: | 1573-2959 0167-6369 |
| DOI: | 10.1007/s10661-006-9456-6 |
| Popis: | 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 microg.m(-2).year(-1), which are the contour intervals used to display the data on NADP isopleths maps for concentration and deposition, respectively. |
| Databáze: | OpenAIRE |
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