日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS04] 大気化学

2019年5月30日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:中山 智喜(長崎大学 大学院水産・環境科学総合研究科)、岩本 洋子(広島大学 生物圏科学研究科)、豊田 栄(東京工業大学物質理工学院)、江口 菜穂(Kyushu University)

[AAS04-P03] Investigation of Atmospheric Aerosol Particles and gases by R/V Mirai cruise over the Arctic Ocean on 2017

*竹谷 文一1加藤 咲1,2宮川 拓真1滝川 雅之1山口 将大1高島 久洋1,2Petr Mordovskoi1金谷 有剛1 (1.海洋研究開発機構、2.福岡大学)

キーワード:ブラックカーボン、北極海、船上観測

Atmospheric aerosol particles play an important role in Arctic climate through the absorbing and scattering of solar radiation. Also, the deposition of light-absorbing particles on the surface reduces the Earth’s albedo and accelerates snow/ice melting by absorbing the sunlight. However, the observational information has been still insufficient to assess their contribution over the Arctic region. In this study, we conducted the ship-based measurements of marine aerosol particles (black carbon (BC), and fluorescent property) and trace gases (ozone and carbon monoxide) using R/V Mirai during a cruise across the Arctic Ocean and Bering Sea (23 August – 4 October 2017). The measured BC mass concentration over the Arctic Ocean in the latitudinal region > 70°N was an overall mean value of 3.5 ± 2.0 ng/m3 . This value was almost same to the levels recorded during our previous observations in the Arctic cruise on September during 2014 -2016. We captured relatively high BC mass concentration and/or CO mixing ratio events at 4 and 7-12 September 2017. The trajectory and BC property suggested that the source of BC on 4 September could be oil field at north of Alaska. We will present further analysis on the size distribution, BC mixing state, during the cruise in the presentation.