Mercury Wet Scavenging and Deposition Differences by Precipitation Type
| Autor: | Aaron Kaulfus, Christopher D. Holmes, William M. Landing, U. S. Nair |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Air Pollutants
010504 meteorology & atmospheric sciences Rain chemistry.chemical_element Storm Mercury General Chemistry 010501 environmental sciences Atmospheric sciences 01 natural sciences United States Mercury (element) Deposition (aerosol physics) chemistry Climatology Extratropical cyclone Precipitation types Thunderstorm Environmental Chemistry Environmental science Seasons Precipitation Scavenging Environmental Monitoring 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science & Technology. 51:2628-2634 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | We analyze the effect of precipitation type on mercury wet deposition using a new database of individual rain events spanning the contiguous United States. Measurements from the Mercury Deposition Network (MDN) containing single rainfall events were identified and classified into six precipitation types. Mercury concentrations in surface precipitation follow a power law of precipitation depth that is modulated by precipitation system morphology. After controlling for precipitation depth, the highest mercury deposition occurs in supercell thunderstorms, with decreasing deposition in disorganized thunderstorms, quasi-linear convective systems (QLCS), extratropical cyclones, light rain, and land-falling tropical cyclones. Convective morphologies (supercells, disorganized, and QLCS) enhance wet deposition by a factor of at least 1.6 relative to nonconvective morphologies. Mercury wet deposition also varies by geographic region and season. After controlling for other factors, we find that mercury wet deposition is greater over high-elevation sites, seasonally during summer, and in convective precipitation. |
| Databáze: | OpenAIRE |
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