Changes in atmospheric oxidants over Arctic Ocean atmosphere: evidence of oxygen isotope anomaly in nitrate aerosols

Yanlin Zhang*, Zhuyu Zhao, Fang Cao, Wenhuai Song, Yuchi Lin, Meiyi Fan, Haoran Yu, Hanyu Li, Yihang Hong, Meng Gao

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

1 Citation (Scopus)

Abstract

Oxygen isotope anomaly of nitrate aerosol (∆17O-NO3) contributes to understanding the atmospheric nitrogen chemistry in the polar oceans. Here, ∆17O-NO3 of the aerosol samples was analyzed based on a cruise from East Asia to the Arctic Ocean to explore the nitrate formation mechanisms. ∆17O-NO3 decreased with the increase of latitude, especially when after entering the Arctic Circle. ∆17O-NO3 (e.g., 11.5‰–21.2‰) was extremely low while crossing the sea ice-covered Arctic Ocean. This is most likely influenced by the combined enhancement of hydroxyl (OH) and peroxy (HO2 + RO2) radicals derived by sea ice under permanent sunlight period. In addition, the obvious increase in the ∆17O-NO3 of return trip with shortened daytime indicated the advantage of nocturnal pathways (NO3 related) with the higher ∆17O endmembers. The mutation of ∆17O-NO3 can reflect the change of NOx conversion pathways to nitrate, and it can be more sensitive to the change of radical chemistry related to atmospheric oxidation.

Original languageEnglish
Article number124
Number of pages9
Journalnpj Climate and Atmospheric Science
Volume6
Issue number1
Early online date23 Aug 2023
DOIs
Publication statusPublished - Dec 2023

Scopus Subject Areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Atmospheric Science

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