Advances in tropospheric night-time chemistry

The nitrate radical NO3 and N2O5 play key roles in the night-time chemistry of troposphere. The NO, radicals oxidize volatile organic compounds ( VOCs) origining from biogenic emission, which is the primary sink of biogenic VOCs. Besides,the heterogeneous reactions of NO3 and N2O5 in aerosol and rainwater are the main scavenging processes of NO, in atmosphere, alleviating the ozone pollution in troposphere. Consequently, the field measurement and chemical characteristics study are very significant to understand the atmospheric chemical processes and the self-cleaning capacity of the global troposphere comprehensively. The recent progress and achievements on night-time chemistry of NO3 and NOx the field measurements, chemical reactions, the sources and sinks are reviewed, and some problems to be solved in the future are put forward.