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From the same journal

Influence of bromine and iodine chemistry on annual, seasonal, diurnal, and background ozone: CMAQ simulations over the Northern Hemisphere

Research output: Contribution to journalArticlepeer-review


  • Golam Sarwar
  • Brett Gantt
  • Kristen Foley
  • Kathleen Fahey
  • Tanya L. Spero
  • Daiwen Kang
  • Rohit Mathur
  • Hosein Foroutan
  • Jia Xing
  • Tomás Sherwen
  • Alfonso Saiz-Lopez


Publication details

JournalAtmospheric Environment
DateAccepted/In press - 8 Jun 2019
DateE-pub ahead of print - 11 Jun 2019
DatePublished (current) - 15 Sep 2019
Number of pages10
Pages (from-to)395-404
Early online date11/06/19
Original languageEnglish


Bromine and iodine chemistry has been updated in the Community Multiscale Air Quality (CMAQ) model to better capture the influence of natural emissions from the oceans on ozone concentrations. Annual simulations were performed using the hemispheric CMAQ model without and with bromine and iodine chemistry. Model results over the Northern Hemisphere show that including bromine and iodine chemistry in CMAQ not only reduces ozone concentrations within the marine boundary layer but also aloft and inland. Bromine and iodine chemistry reduces annual mean surface ozone over seawater by 25%, with lesser ozone reductions over land. The bromine and iodine chemistry decreases ozone concentration without changing the diurnal profile and is active throughout the year. However, it does not have a strong seasonal influence on ozone over the Northern Hemisphere. Model performance of CMAQ is improved by the bromine and iodine chemistry when compared to observations, especially at coastal sites and over seawater. Relative to bromine, iodine chemistry is approximately four times more effective in reducing ozone over seawater over the Northern Hemisphere (on an annual basis). Model results suggest that the chemistry modulates intercontinental transport and lowers the background ozone imported to the United States.

Bibliographical note

This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

    Research areas

  • Background ozone, Bromine, CMAQ, Iodine, Ozone

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