However, although such correction is desirable for affected samples, it is essential that such correction is accurate in order to produce useful chronological information.Accuracy of FRE correction can be limited by spatial variation in FRE within a freshwater system, but despite this there is currently a paucity of information to identify and quantify such variability within affected systems.

C and other radioisotopes and techniques used in archaeological, geophysical, oceanographic, and related dating. We also publish conference proceedings and monographs on topics related to our fields of interest.

A freshwater radiocarbon (14C) reservoir effect (FRE) is a 14C age offset between the atmospheric and freshwater carbon reservoirs.

FREs can be on the order of 10 000 14C yr in extreme examples and are a crucial consideration for 14C dating of palaeoenvironmental and archaeological samples.

Correction for a FRE may be possible, provided the FRE and the proportion of FRE-affected carbon within a sample can be accurately quantified.

Accurate radiocarbon dating of marine samples requires knowledge of the marine radiocarbon reservoir effect.

This effect for a particular site/region is generally assumed constant through time when calibrating marine C ages.

However, recent studies have shown large temporal variations of several hundred to a couple of thousand years in this effect for a number of regions during the late Quaternary and Holocene.

The study also assesses the use of δ13C and δ15N in age correction of affected samples.

The results show that benthic detritus and organisms at primary trophic levels from locations within the lake are affected by a FRE of at least 3500 14C yr, with clear spatial variation resulting in 14C age differences of up to 7670 14C yr between samples.