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Shipborne observations reveal contrasting Arctic marine, Arctic terrestrial and Pacific marine aerosol properties

2020-05-13T00:00:00Z

Title: Shipborne observations reveal contrasting Arctic marine, Arctic terrestrial and Pacific marine aerosol properties Authors: Park, Jiyeon; Dall'Osto, Manuel; Park, Kihong; Gim, Yeontae; Kang, Hyo Jin; Jang, Eunho; Park, Ki-Tae; Park, Minsu; Yum, Seong Soo; Jung, Jinyoung; Lee, Bang Yong; Yoon, Young Jun Abstract: There are few shipborne observations addressing the factors influencing the relationships of the formation and growth of aerosol particles with cloud condensation nuclei (CCN) in remote marine environments. In this study, the physical properties of aerosol particles throughout the Arctic Ocean and Pacific Ocean were measured aboard the Korean icebreaker R/V Araon during the summer of 2017 for 25 d. A number of new particle formation (NPF) events and growth were frequently observed in both Arctic terrestrial and Arctic marine air masses. By striking contrast, NPF events were not detected in Pacific marine air masses. Three major aerosol categories are therefore discussed: (1) Arctic marine (aerosol number concentration CN2.5: 413 +/- 442 cm(-3)), (2) Arctic terrestrial (CN2.5: 1622 +/- 1450 cm(-3)) and (3) Pacific marine (CN2.5: 397 +/- 185 cm(-3)), following air mass back-trajectory analysis. A major conclusion of this study is not only that the Arctic Ocean is a major source of secondary aerosol formation relative to the Pacific Ocean but also that open-ocean sympagic and terrestrially influenced coastal ecosystems both contribute to shaping aerosol size distributions. We suggest that terrestrial ecosystems - including river outflows and tundra - strongly affect aerosol emissions in the Arctic coastal areas, possibly more than anthropogenic Arctic emissions. The increased river discharge, tundra emissions and melting sea ice should be considered in future Arctic atmospheric composition and climate simulations. The average CCN concentrations at a supersaturation ratios of 0.4 % were 35 +/- 40 cm(-3), 71 +/- 47 cm(-3) and 204 +/- 87 cm(-3) for Arctic marine, Arctic terrestrial and Pacific marine aerosol categories, respectively. Our results aim to help evaluate how anthropogenic and natural atmospheric sources and processes affect the aerosol composition and cloud properties.

Arctic ship-based evidence of new particle formation events in the Chukchi and East Siberian Seas

2020-02-01T00:00:00Z

Title: Arctic ship-based evidence of new particle formation events in the Chukchi and East Siberian Seas Authors: Dall'Osto, M.; Park, J.; Kim, Joo-Hong; Kang, Sung-Ho; Park, Kihong; Beddows, D.C.S.; Harrison, Roy M.; Yoon, Young Jun Abstract: Arctic aerosol-climate interactions are controlled by multiple factors including sources, processes and removal mechanisms of particles. The Arctic is mostly ocean, surrounded by mostly land, and our understanding of Arctic aerosol processes is incomplete due to scarce measurements carried out in sea ice regions. In particular, it is currently not known if these particular regions are sources of aerosols of primary or secondary origin. We present new results from ship-based measurements illustrating that marine new particle production and growth events occur in open ocean and melting sea ice regions in the Chukchi and East Siberian Seas. We report two new particle formation events during which a recently formed nucleation mode (<15 nm diameter) is detected and is observed to slowly grow into an Aitken mode (0.1-3.8 nm/h). Our results suggest that new particle formation occurs in the marine boundary layer contributing to the Arctic aerosol population in the study region for the first time studied and herein reported.

Arctic Primary Aerosol Production Strongly Influenced by Riverine Organic Matter

2019-08-06T00:00:00Z

Title: Arctic Primary Aerosol Production Strongly Influenced by Riverine Organic Matter Authors: Park, Jiyeon; Dall'Osto, Manuel; Park, Kihong; Kim, Jung-Hyun; Park, Jongkwan; Park, Ki-Tae; Hwang, Chung Yeon; Jang, Gwang Il; Gim, Yeontae; Kang, Sujin; Park, Sanghun; Jin, Young Keun; Yum, Seong Soo; Simo, Rafel; Yoon, Young Jun Abstract: 2017년 아라온 북극 항해 중 다양한 특성 (해양 샘플 vs. 연안 샘플) 을 가지는 표층 바닷물을 샘플링 하여 대기 입자 모사 챔버 실험을 수행하였음. 그 결과 담수 (매켄지 강)의 영향을 받는 북극 연안에서는 육상기원 용존유기물과 마이크로젤 물질이 일차적 해양 에어로졸의 생성 및 구름형성 특성에 상당한 영향을 미치는 것을 확인 함.

A study on physical properties of nanoparticles through Arctic shipping route of ARAON

2018-08-30T00:00:00Z

Title: A study on physical properties of nanoparticles through Arctic shipping route of ARAON Authors: Park, Jiyeon