Tracers anthropogenic

In the marine environment, the numerous radionuclides can be classified into three broad categories based on their production or origin (1) those derived from the weathering of continental rocks, the primordial radionuclides, (2) those formed from cosmic radiation, the cosmogenic radionuclides, and (3) those artificially introduced into nature, the anthropogenic or transient radionuclides and tracers. The primordial radionuclides (e.g. Th, and U) were... 

Hedges, R. E. M., Clement, J. G., Thomas, C. D. L., O CormeU, T. C. (2007). Collagen turnover in the adult femoral mid-shaft Modeled from anthropogenic radiocarbon tracer measurements. American Journal of Physical Anthropology, 133, pp. 808-816. 

There are other metals for which compelling cases can be made to produce contamination-free oceanic reference seawater. These include other bioactive metals (e.g., zinc, cobalt, cadmium, and copper), tracers of anthropogenic contamination (e.g., lead, Box 3.1), and non-bioactive metals used as tracers of geochemical and physical processes (e.g., aluminum). 

Quay, P.D., R. Sonnerup, T. Westby, J. Stutsman, and A.P. McNichol. In press. Anthropogenic changes of the 33C/32C of dissolved inorganic carbon in the ocean as a tracer of C02 uptake. Global Biogeochemical Cycles. 

Source Tracers. The principal anthropogenic sources of primary suspended particulate matter in New York City are transportation, fuel, oil combustion for power and space heating, and incineration (, 15). From approximately November through... 

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