Validation of Column-Averaged Dry-Air Mole Fraction of CO2 Retrieved from OCO-2 Using Ground-Based FTS Measurements

• DOI: 10.1007/s13351-018-7118-6
• Publication Date: 2018-07-09T02:53:14Z
• Authors: Yanmeng Bi; Qian Wang; Zhongdong Yang; Jie Chen; Wenguang Bai
• Keywords: Nadir; Mode (computer interface)

In order to correctly use the column-averaged atmospheric CO2 dry-air mole fraction (XCO2) data in flux studies, XCO2 measurements retrieved from Orbiting Carbon Observatory-2 (OCO-2) 2015 were compared with those obtained global ground-based high-resolution Fourier Transform Spectrometer (FTS) participating Total Column Observing Network (TCCON). The three observing modes adopted by OCO-2, i.e., nadir, target, and glint, separately validated FTS at up eight TCCON stations located different areas. These comparisons show that OCO-2 glint mode yields best qualitative estimations of concentration among operational approaches. overall results regarding no obvious systematic biases. facts may indicate concept is appropriate for not only oceans but also land regions. Negative biases nadir target have been found most sites. standard deviations within observation period are similar, larger than mode. We used site Beijing, China, assess 2016. This a typical urban area, which has absent previous studies. Overall, agrees well this site. Such study will benefit validation newly launched TanSat products China.