My research interests are in chemistry aspects of aerosol formations and growth in pristine environment, as well as in deciphering chemical indices recorded in ice cores in the context of historical changes of aerosols. In a specific focus, we have developed understanding of formation processes of sulfate, a key participant for both new particle formation and particle growth through cloud processing, in the Antarctic atmosphere. By comparing the oxygen isotopes (17O-excess) of sulfate simulated by GEOS-Chem to those observed in the present Antarctic troposphere, we have found a missing reaction, sulfate formation from oxidation of methanesulfonate (MSA) which was often recognized as an end-product. My ultimate goal is to address constraints on pre-industrial state of aerosols, which hold a major uncertainty in projecting future climate changes.

Keywords: Sulfate, Dimethyl sulfide, Ice core, 17O-excess (Δ17O), Stable sulfur isotopes (δ34S, Δ33S, Δ36S), Antarctica, Southern Ocean, Aerosol, Oxidants

Research field: Atmospheric Chemistry, Cryosphere, Isotope Geochemistry

More about research topics here.

• Early Career Scientist Poster Prize, “Oxidation of methanesulfonate into sulfate at inland Antarctica evidenced by 17O-excess signature”, The IGAC Conference 2021, Online (Sep. 2021)

• Best Presentation Award, “Investigation of oxidation chemistry in the Antarctic atmosphere using triple oxygen isotopic compositions of sulfate, nitrate and ozone”, The 6th International Education Forum of Academy for Co-creative Education of Environment and Energy Science (ACEEES), Spain (Dec. 2017)

• Best Student Presentation Award, “Seasonal variations of multiple isotopic compositions of atmospheric sulfate and nitrate at coastal Antarctica”, The 64th meeting of Geochemical Society of Japan. (Sep. 2017)

• The Outstanding Student Presentation Award, “A year-round observation of sulfur stable isotopic compositions of atmospheric sulfate at Dumont d’Urville, coastal Antarctica”, The 1st JpGU–AGU Joint Meeting, Japan. (May 2017) 

• ACP Editor’s Highlight: Ishino et al. (2017) “Seasonal variations of triple oxygen isotopic compositions of atmospheric sulfate, nitrate, and ozone at Dumont d’Urville, coastal Antarctica” 

2021 - present: Associate member of SCOR Working Group #163 “Coupling of ocean-ice-atmosphere processes: from sea-Ice biogeochemistry to aerosols and Clouds (CIce2Clouds)” 

2021 - present: Committee of JpSAC working group for gender equality and human resource development 

2019 Dec. - 2020 Mar.: The 61st Japanese Antarctic Research Expedition, Summer Campaign at Syowa station, supported by National Institute of Polar Research (NIPR) 

2017 - 2019: Co-Chair of Early Career Program Organizing Committee of the 2018 joint 14th iCACGP Quandrennial Symposium and 15th IGAC Science Conference (link)

2016 Dec. - 2017 Jan.: 2016/2017 Summer Campaign TA67 at Dumont d’Urville and Concordia stations, supported by French Polar Institute Paul-Emile Victor (IPEV)