海洋表面における反応の直接測定のための高感度化学イオン化質量分析計の開発
Department of Chemistry and Biochemistry University of California, San Diego, Assistant Professor, Ph. D
Chemical reactions at the air-sea interface have been shown to alter oxidant concentrations in the atmosphere. To date, limitations in trace gas measurement technology have prohibited the direct in situ measurement of air-sea exchange for all but a select number of gases. Here, we describe the application of high sensitivity chemical ionization mass spectrometry (CIMS) for the selective measurement of trace gas deposition via eddy covariance. We show that eddy covariance techniques, when coupled with high sensitivity CIMS measurements have the sensitivity to directly determine vertical fluxes of reactant and product pairs such as N2O5 and ClNO2[1]. The eddy covariance studies permit a direct assessment of the importance of the air-sea interface as a net source or sink for reactive trace gases in marine environments, while serving to connect mechanistic investigations conducted on the laboratory scale to ambient conditions.
[1] Kim, M., Farmer, D., Bertram, T.H., “A controlling role for the air-sea interface in the chemical processing of reactive nitrogen in the coastal marine boundary layer”, PNAS, 2014.