The marine reservoir effect is a phenomenon affecting radiocarbon dating. Because much of the carbon consumed by organisms in the ocean is older than that consumed by organisms on land, samples from marine life and from organisms that consumed a lot of sea-based foods while alive may appear older when tested than they truly are.[1] It is necessary to account for changes in the Earth's oceans to correct for the marine reservoir effect.[2] The level of the effect on a particular sample varies significantly, depending on the body of water, and more locally on depths, upwelling currents, and freshwater discharges.[3]
Typically, affected radiocarbon dates appear c. 400 14C years older than they would if unaffected. But the effect is highly variable in space and time, and can reach 800 to 1200 14C years in Arctic regions.[2] In 2013, archaeologists at the Gottorp Castle Museum tested the effects of fish prepared in a newly made clay vessel on their ability to accurately measure carbon-14 in the clay pottery. After making the clay vessel fish was prepared in the vessel over a fire. The archaeologists made sure some of the fish stuck to the pot. The pot and some of the burnt crust at the bottom were tested which showed a Carbon-14 14C age of 700 years old. Felix Riede estimated at the time the use of the Carbon-14 method maybe off by 2,000 years.[4]
^University of Bristol (February 2, 2018). "Radiocarbon dating reveals mass grave did date to the Viking age". Eurekalert. Retrieved February 4, 2018.
^ abPhilippa Ascough; Gordon Cook; Andrew Dugmore (December 1, 2005). "Methodological approaches to determining the marine radiocarbon reservoir effect" (PDF). Progress in Physical Geography: Earth and Environment. 29 (4): 532–547. Bibcode:2005PrPG...29..532A. doi:10.1191/0309133305pp461ra. S2CID 13472555.
^"Marine Reservoir Effect, Corrections to Radiocarbon Dates". Carbon Dating Service, AMS Miami - Beta Analytic. 2015-04-16. Retrieved 2022-02-19.
^Neils Ebdrup (14 March 2013). "Fish corrupt Carbon-14 dating". Science Nordic. Retrieved 27 November 2020.
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