Fossil and contemporary fine particulate carbon fractions at 12 rural and urban sites in the United States
Fine particulate matter collected at two urban, four near-urban, and six remote sites throughout the United States were analyzed for total carbon (TC) and radiocarbon (14C). Samples were collected at most sites for both a summer and winter season. The radiocarbon was used to partition the TC into fossil and contemporary fractions. On average, contemporary carbon composed about half of the carbon at the urban, ∼70-97% at near-urban, and 82-100% at remote sites. At Phoenix, Arizona, and Seattle,...[Show more]
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|Source:||Journal of Geophysical Research|
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