Temporal dynamics of airborne lead-210 in Missouri (USA): implications for geochronological methods |
| |
| Authors: | R W Sheets A E Lawrence |
| |
| Institution: | (1) Department of Chemistry, Southwest Missouri State University, Springfield, MO, USA 65804-0089 e-mail: rws080f@mail.smsu.edu, US |
| |
| Abstract: | Lead-210 (210Pb) deposited from the atmosphere is used in the dating of certain geological materials such as glacial ice and lacustrine
sediments, but its long-term atmospheric behavior has been little studied. The present investigation reports measurements
of airborne 210Pb at 21 monitoring stations in Springfield, Missouri, during 1975–1995. Seasonal and diurnal patterns of atmospheric concentrations
are established, and the mean annual concentrations of 210Pb in ground level air during the 20-year period are examined. Although airborne 210Pb concentrations are found to vary diurnally and seasonally, mean annual concentrations in southwest Missouri have remained
relatively constant during this time period. This finding is important for geochronological methods that assume a constant
210Pb flux from the atmosphere.
Received: 8 September 1998 · Accepted: 12 October 1998 |
| |
| Keywords: | Atmospheric lead-210 Lead-210 dating Geochronology Radiometric methods |
| 本文献已被 SpringerLink 等数据库收录！ |
|
