scholarly journals 14C Measurements of Tree Rings of a Japanese Cedar During 1945 to 2000 and Core Sampling for Environmental Studies

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 1045-1053 ◽  
Author(s):  
H Kawamura ◽  
H Kofuji ◽  
S Gasa ◽  
M Kamamoto ◽  
N Sawafuji ◽  
...  
Keyword(s):  
20Th Century ◽  
Tree Rings ◽  
Environmental Studies ◽  
Japanese Cedar ◽  
Nuclear Testing ◽  
Local Effects ◽  
Core Sampling ◽  
Radiocarbon Data ◽  
Marine Environmental ◽  
Aomori Prefecture

Japanese cedar rings sampled from Aomori Prefecture, Japan, were measured to obtain tree-ring radiocarbon data covering a period of the latter half of the 20th century in the northernmost area of Honshu (mainland Japan), to obtain records of variation in atmospheric 14C concentration caused by past atmospheric nuclear testing, and to study any possible local effects. This work, carried out on a partial disk, was also intended to provide a reference for data obtained by core sampling of live, standing Japanese black pines as a part of marine environmental studies.

Review of Radiocarbon Data from Atmospheric and Tree Ring Samples for the Period 1945-1997 Ad

IAWA Journal ◽  
1999 ◽  
Vol 20 (3) ◽  
pp. 261-283 ◽  
Author(s):  
Quan Hua ◽  
Mike Barbetti ◽  
Martin Worbes ◽  
John Head ◽  
Vladimir A. Levchenko
Keyword(s):  
Tree Ring ◽  
Excellent Agreement ◽  
Tree Rings ◽  
Seasonal Fluctuations ◽  
Wood Material ◽  
Local Effects ◽  
Latitude Dependence ◽  
Bomb Test ◽  
Radiocarbon Data ◽  
Atmospheric Sampling

A summary of 14C data from atmospheric sampling and measurements on wood from annual tree rings for the period 1945-1997 AD is presented and evaluated. Atmospheric records are characterized by different distributions of bomb-test 14C between the Northem and Southem Hemispheres, latitude dependence, and seasonal fluctuations. Radiocarbon data from tree rings are summarised and plotted against atmospheric records from similar latitudes. In some cases, discrepancies are found. Possible reasons for this include: 1) the use of stored carbohydrate from the previous year, 2) different 14C levels in the air around subcanopy trees due to respiration of CO2, 3) regional and local effects of anthropogenic CO2 and 14C sources, 4) sampling of wood material too close to ring boundaries, and 5) insufficient pretreatment of tree ring sampies for dating. But in cases where trees were carefully selected and the sampies adequately pretreated, radiocarbon data from tree rings show excellent agreement with direct atmospheric sampling records.

Trace metals speciation in coastal particulate matter for marine environmental studies in Antarctica

2005 ◽  
Vol 7 (12) ◽  
pp. 1287 ◽  
Author(s):  
E. Magi ◽  
C. Ianni ◽  
F. Soggia ◽  
M. Grotti ◽  
R. Frache
Keyword(s):  
Particulate Matter ◽  
Trace Metals ◽  
Environmental Studies ◽  
Marine Environmental

Mongolian Tree Rings and 20th-Century Warming

Science ◽  
1996 ◽  
Vol 273 (5276) ◽  
pp. 771-773 ◽  
Author(s):  
G. C. Jacoby ◽  
R. D. D'Arrigo ◽  
T. Davaajamts
Keyword(s):  
20Th Century ◽  
Tree Rings

Abrupt Increase of Radiocarbon Concentration in 660 BC in Tree Rings from Grabie Near Kraków (SE Poland)

Radiocarbon ◽  
2019 ◽  
Vol 61 (5) ◽  
pp. 1327-1335 ◽  
Author(s):  
Andrzej Rakowski ◽  
Marek Krąpiec ◽  
Matthias Huels ◽  
Jacek Pawlyta ◽  
Christian Hamann ◽  
...  
Keyword(s):  
Tree Rings ◽  
Cryptomeria Japonica ◽  
Japanese Cedar ◽  
Chamaecyparis Obtusa ◽  
Peak Height ◽  
Sudden Increase ◽  
Similar Increase ◽  
Abrupt Increase ◽  
Hinoki Cypress ◽  
Se Poland

AbstractMiyake et al. (2012, 2013, 2014) described a sudden increase of radiocarbon (14C) concentration in annual tree rings of Japanese cedar (Cryptomeria japonica) and Hinoki cypress (Chamaecyparis obtusa) between AD 774 and 775 and between AD 993 and 994. In both analyzed periods, the sudden increase was observed almost in a single year. The increase in the 14C content was about 12‰ in the period AD 774–775 (Miyake et al. 2012) and about 11.3‰ in the period AD 993–994 (Miyake et al. 2013, 2014; Fogtmann-Schultz et al. 2017; Rakowski et al. 2018). A similar increase was observed in 660 BC, with a peak height of about 10‰ (Park et al. 2017). Single-year samples of dendrochronologically dated tree rings of deciduous oak (Quercus robur) from Grabie, a village near Krakow (SE Poland), spanning the years 670–652 BC, were collected and their 14C content was measured using an AMS technique. The results clearly show a rapid increase in the 14C concentration in tree rings around 660 BC similar to this observed in Park et al. (2017).

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