14C anomaly of freshwater algae in Antarctic coastal ponds and lakes

In order to clarify the credibility of ^<14>C dating of Antarctic freshwater algae, δ^<13>C values and ^<14>C concentrations of algae collected from some lakes and ponds in Antarctic coastal areas were analyzed. ^<14>C concentration was measured by Tandetron Accelerator Mass...

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Bibliographic Details
Main Authors: Hiroshi A. Takahashi, Hideki Wada, Toshio Nakamura, Hideki Miura
Format: Report
Language:English
Published: Earth and Planetary Sciences, Graduate School of Science, Nagoya University/Biology and Geoscience, Faculty of Science, Shizuoka University/Dating and Materials Research Center, Nagoya University/National Institute of Polar Research 1999
Subjects:
AMS ^<14>C measurement
Antarctic algae
^<14>C anomaly
reservoir effect
Antarctic
Ross Island
McMurdo Station
Riiser-Larsen
Crater Hill
First Crater
Antarc*
Antarctica
Enderby Land
Polar geoscience
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3056
http://id.nii.ac.jp/1291/00003056/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3056&item_no=1&attribute_id=18&file_no=1
Description
Summary:In order to clarify the credibility of ^<14>C dating of Antarctic freshwater algae, δ^<13>C values and ^<14>C concentrations of algae collected from some lakes and ponds in Antarctic coastal areas were analyzed. ^<14>C concentration was measured by Tandetron Accelerator Mass Spectrometry. The δ^<13>C values of algae from Antarctica are relatively higher than global values. The reason for the relatively high δ^<13>C values of Antarctic algae may be sought in the limited CO_2 (aq) supply for algae in lake water. ^<14>C concentrations of algae from ponds in the First Crater and Crater Hill near McMurdo Station on Ross Island, where glacial meltwater does not flow into the ponds, are close to the global level in the same year. On the other hand, the algae from Richardson Lake in the Mt. Riiser-Larsen area in Enderby Land, where glacial meltwater flows into the lake, apparently have low ^<14>C concentration, ca. 90% of the global level. These facts lead us to the conclusion that the ^<14>C anomaly is attributable to a DIC of relatively low ^<14>C concentration derived from glacial meltwater with older carbon. If such samples are used for ^<14>C dating, the age determination will be erroneous.

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