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