The miyake event in 993 ce recorded in oak sub-annual tree rings from kujawy (poland)

This article presents measurements of the radiocarbon (C-14) concentration in sub-annual tree rings. Samples of earlywood (EW) and latewood (LW) from dendrochronologically dated tree rings (English oak, Quercus robur) from Kujawy, near Krakow (Poland), spanning the years of 990-997 CE, are extracted and their C-14 content is measured at the Center for Applied Isotope Studies at the University of Georgia, USA. The EW and LW data show a gradual increase in the Delta C-14 values between 991-995 CE, which are similar to those observed by Rakowski et al. (2018). An increase of 10.3 +/- 2.6 parts per thousand in Delta C-14 for the EW data, and 8.6 +/- 2.6 parts per thousand for the LW data has been recorded for this period. Using this data, it is possible to estimate the time period for when a major historical event occurred, which seems to have been in the late summer (September -2/+1 month) of 993 CE.