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Ice core record of rising lead pollution in the North Pacific atmosphere

doi: 10.1029/2007gl032680
A high‐resolution, 8000 year‐long ice core record from the Mt. Logan summit plateau (5300 m asl) reveals the initiation of trans‐Pacific lead (Pb) pollution by ca. 1730, and a >10‐fold increase in Pb concentration (1981–1998 mean = 68.9 ng/l) above natural background (5.6 ng/l) attributed to rising anthropogenic Pb emissions from Asia. The largest rise in North Pacific Pb pollution from 1970–1998 (end of record) is contemporaneous with a decrease in Eurasian and North American Pb pollution as documented in ice core records from Greenland, Devon Island, and the European Alps. The distinct Pb pollution history in the North Pacific is interpreted to result from the later industrialization and less stringent abatement measures in Asia compared to North America and Eurasia. The Mt. Logan record shows evidence for both a rising Pb emissions signal from Asia and a trans‐Pacific transport efficiency signal related to the strength of the Aleutian Low.
- Geological Survey of Canada Canada
- University of Maine United States
- United States Department of the Interior United States
- Geological Survey of Canada Canada
- University of Maine United States
Glaciogeology, Glaciology, Climate Change, Cryology, Oceanography, Geochemistry, Earth Sciences, Hydrology, Environmental Monitoring
Glaciogeology, Glaciology, Climate Change, Cryology, Oceanography, Geochemistry, Earth Sciences, Hydrology, Environmental Monitoring
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).94 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10%
