Determination of vertical profiles and origins of atmospheric HONO and NO2 by integration of remote and in-situ observation methodologies

2015 Fiscal Year Final Research Report

• Project/Area Number: 26550022
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: KANAYA Yugo 国立研究開発法人海洋研究開発機構, 地球表層物質循環研究分野, 分野長代理 (60344305)
• Co-Investigator(Renkei-kenkyūsha): KOMAZAKI Yuichi 国立研究開発法人海洋研究開発機構, 地球表層物質循環研究分野, 主任技術研究員 (80286640)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 地球観測 / 大気現象 / 地球変動予測 / 対流圏化学 / 窒素酸化物

Outline of Final Research Achievements

During winter of 2014 and 2016, and summer of 2014, we observed atmospheric HONO and its precursor NO2 by remote sensing (MAX-DOAS) and by in-situ analyzers (LOPAP and CAPS) in Yokosuka, to elucidate altitude range in which HONO was present and its production processes. HONO/NO2 ratio at the surface level was 2-4% and 1-2% during nighttime and daytime in winter, while they were 1-2% and 2-3% in summer. Missing production rate of HONO from NO2 was estimated to be 0.2 and 0.5 ppb h-1 during winter and summer. Correlation analysis suggested that water vapor, photolysis, and carbonaceous aerosols might participate in the processes. The photolysis of HONO was more important than the photolysis of O3 as OH radical sources in the both seasons.

Free Research Field

大気化学