Behavior of marine originated bromine species in authentic aerosols collected in Okinawa, Japan

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K12191
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: University of the Ryukyus
• Principal Investigator: ARAKAKI Takemitsu 琉球大学, 理学部, 教授 (80343375)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 大気エアロゾル / 臭素 / 光化学反応 / 活性酸素 / 有機物

Outline of Final Research Achievements

Ozone in the atmosphere can be drastically destroyed by reaction with active bromine species. Origin and formation mechanisms of active bromine species are of special interest since ozone affects atmospheric oxidation capacity. We have investigated chemical forms of bromine in atmospheric aerosols collected in Okinawa, Japan. We found that nearly half of marine originated bromine was vaporized from the aerosols to gas phase by forming gaseous species. The rest was ca. 40% water-soluble Br species, mainly Br-, and 5% water-insoluble Br species. Further study is needed to better understand transformation mechanisms of Br in aerosols.

Free Research Field

大気化学