Photolysis of Particulate Nitrate as a Source of HONO and NOx

Environmental Science & Technology
Chunxiang YeXianliang Zhou

Abstract

Photolysis of nitric acid on the surface has been found recently to be greatly enhanced from that in the gas phase. Yet, photolysis of particulate nitrate (pNO3) associated with atmospheric aerosols is still relatively unknown. Here, aerosol filter samples were collected both near the ground surface and throughout the troposphere on board the NSF/NACR C-130 aircraft. The photolysis rate constants of pNO3 were determined from these samples by directly monitoring the production rates of nitrous acid (HONO) and nitrogen dioxide (NO2) under UV light (>290 nm) irradiation. Scaled to the tropical noontime condition on the ground level (solar zenith angle = 0°), the normalized photolysis rate constants (jpNO3(N)) are in the range from 6.2 × 10(-6) s(-1) to 5.0 × 10(-4) s(-1) with a median of 8.3 × 10(-5) s(-1) and a mean (±1 SD) of (1.3 ± 1.2) × 10(-4) s(-1). Chemical compositions, specifically nitrate loading and organic matter, affect the rate of photolysis. Extrapolated to ambient pNO3 loading conditions, e.g. ≤ 10 nmol m(-3), the mean jpNO3(N) value is over 1.8 × 10(-4) s(-1) in the suburban, rural, and remote environments. Photolysis of particulate nitrate is thus a source of HONO and NO2 in the troposphere.

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Citations

Apr 3, 2020·Journal of the Air & Waste Management Association·Daniel A JaffeAna G Rappold
Mar 15, 2019·Scientific Reports·Chunxiang YeXianliang Zhou
Nov 22, 2020·The Science of the Total Environment·Sérgio J GonçalvesRicardo H M Godoi
Feb 28, 2021·Journal of Environmental Sciences (China)·Wenwen XuXiangxin Xue
Apr 17, 2021·Environmental Science & Technology·Ruifeng ZhangChak K Chan
Apr 27, 2021·The Journal of Physical Chemistry. a·Zhancong LiangChak K Chan
Jun 17, 2021·Environmental Science & Technology·Qingxin MaHong He
Jul 3, 2021·Journal of Environmental Sciences (China)·Chuan YuTao Wang
Jul 9, 2021·Environmental Science & Technology·Shubhrangshu PanditVicki H Grassian
Sep 15, 2020·Environmental Science & Technology·Wenqian ZhangMaofa Ge
Feb 28, 2019·Environmental Science & Technology·Yuhan LiuYuanhang Zhang
Nov 9, 2018·Environmental Science & Technology·Paul S RomerRonald C Cohen
May 2, 2018·Environmental Science & Technology·Fengxia BaoJincai Zhao
Feb 23, 2020·Environmental Science & Technology·Fengxia BaoJincai Zhao
Jan 5, 2021·Environmental Science & Technology·Qianwen ShiQing Ye
Mar 5, 2020·Environmental Science & Technology·Ruifeng ZhangChak K Chan
Sep 29, 2020·Environmental Science & Technology Letters·Haotian ZhengMichael B McElroy
Nov 23, 2021·Atmospheric Chemistry and Physics·Shuping ZhangHong He
Dec 14, 2021·The Science of the Total Environment·Rongrong GuWenxing Wang

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