Greenland Summit 14C and close-off studies

• Main Authors: Vasilii Petrenko, Jeffrey Severinghaus, Edward Brook
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center 2020
• Subjects: carbon-14; ice core; Greenland; Summit; firn; firn air; carbon monoxide; methane; carbon dioxide; cosmogenic; air content
• Online Access: https://search.dataone.org/view/urn:uuid:6820eabe-3af2-44ac-b8c7-b5b20ef8cc23

The main goal of this study involved the thorough characterization of in situ cosmogenic 14C (14CO2, 14CO and 14CH4) through the entire firn column and in ice just below close-off at Summit, Greenland. This involved sampling of the firn air open porosity in May 2013, the shallow firn matrix in May/Jun 2014, and the deeper fin, Lock-In-Zone and ice below closeoff to ~130m in May/June 2015. Additional samples were collected to explore the effect of bubble trapping on [CH4] and noble gas ratios using high resolution methods. This data set, currently contains the following measurements and analyses: 1) 14CO, 14CO2 and 14CH4 data from measurements in firn air at Greenland Summit. 2) 14CO and 14CH4 measurements in mature ice below close off from 90-130m at Greenland Summit. 3) Supporting firn air trace gas measurements for firn model tuning 4) Noble gas isotope measurements in firn air 5) high-resolution measurements of CH4 and air content in the lock-in zone The following measurements are still undergoing final interpretation and will be included at a later date: 6) [CO] and CO stable isotopes in firn air 7) in situ cosmogenic 14CO and 14CH4 in the firn matrix from 0-130m 8) 14CO2 from the firn matrix and ice below closeoff