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The assumptions, however, do not paint the real picture. There are several factors that need to be considered because they affect the global concentration of carbon 14 and therefore that of any given sample for radiocarbon dating. The atmosphere, oceans, and biosphere are radiocarbon reservoirs of varying concentrations. Radiocarbon formed in the atmosphere is dissolved in oceans in the form of carbon dioxide and contemporaneously assimilated by plants through photosynthesis and enters food chains.

This is how terrestrial organisms take in carbon 14 in their systems. Marine organisms and those who consume them take in carbon 14 from the exchange process of carbon 14 in the form of carbon dioxide in the atmosphere and the ocean or any body of water. However, carbon 14 content is not the same at the surface mixing layers and that in the deep ocean; hence, not all marine organisms have the same radiocarbon content. There are many factors to consider when measuring the radiocarbon content of a given sample, one of which is the radiocarbon content of the plant or animal source when it was alive and its local environment.

This is especially true when comparing samples from terrestrial organisms and those that assimilated radiocarbon from the marine environment. Oceans are large carbon 14 reservoirs. Surfaces of oceans and other bodies of water have two sources of radiocarbon — atmospheric carbon dioxide and the deep ocean. Deep waters in oceans get carbon 14 from mixing with the surface waters as well as from the radioactive decay already occurring at their levels. Studies show that equilibration of carbon dioxide with carbon 14 in surface water is of the order of 10 years.

The degree of equilibration of carbon dioxide in deep water remains unknown. Radiocarbon dates of a terrestrial and marine organism of equivalent age have a difference of about radiocarbon years. Terrestrial organisms like trees primarily get carbon 14 from atmospheric carbon dioxide but marine organisms do not. Samples from marine organisms like shells, whales, and seals appear much older.


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Another factor to consider is that the magnitude of the marine reservoir effect is not the same in all locations. The mixing of deep waters upward with surface waters—in a phenomenon known as upwelling—is latitude dependent and occurs predominantly in the equatorial region.

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Coastline shape, local climate and wind, trade winds, and ocean bottom topography also affect upwelling. According to a study published in by J. There are three methods used in determining regional differences in marine radiocarbon reservoir effect, as listed by Sean Ulm in a report dated December Terrestrial and marine samples cannot be compared or associated without accounting for the marine radiocarbon reservoir effect.


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  8. Correction factors for different oceans in the world are found in an online database, the Marine Reservoir Correction Database, funded in part by the Institute for Aegean Prehistory. Actual correction varies with location due to complexities in ocean circulation. Depending on the age of the marine carbonate, a to year correction i. This automatic correction means the radiocarbon date gets more recent in time due to the fact that it takes years for present-day carbon dioxide in the atmosphere to be incorporated and distributed equilibrated through the ocean water column.

    A negative Delta-R will make the date older typically presuming freshwater dilution from the global marine average. Freshwater systems running through limestone or fed by old water from springs can lead to falsely old ages in carbonate AMS dates. The dissolved inorganic carbon DIC used by the individuals to form their shells or in the precipitation of carbonate concretions will be older than the time of formation due to old DIC from the limestone.

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