Δ14C peak (BC660-5) appearing in earlywood and latewood from tree rings close polar area (Finland)
Dr Junghun Park1, Dr. Joonas Uusitalo, Dr. Wan Hong1, Dr. G. Park1, Dr. K. S. Sung1, Laura Arppe1, Samuli Helama1, Harri Mäkinen1, Pekka Nöjd1, Markku Oinonen1
1Kigam, Daejeon, South Korea
Since annual Δ¹⁴C graph can mean special thing like M12, 993/4 CE and ~BC660, the causes and the detail procedures are surveyed. We focused BC 660 Δ¹⁴C peak and collected tree rings in the area (Finland) close polar. Tree rings on this area can respond to extreme solar proton events (SPE) faster than other areas, so we respect information about detail procedure and intensity of ~BC660 event. The tree rings were divided into earlywood and latewood and precisely measured. Measured data were compared with air simulation results using new estimated troposphere and stratosphere ratio and carbon oxidation time. Timing and intensity of SPE were estimated and what the cause of longer increase time of ~BC660 event is two serial SPE became more reliable from the analysis.
I have worked at KIGAM in Korea for 16 years. I have maintained AMS, and developed pretreating method of samples and system. I have analysed the data from AMS for dating service and study. Nowadays I am interested in anomaly of 14C peak( AD774, AD993/4, ~BC660)