Biogenic marine emissions CH2Br2 and CHBr3

Hi all,

I’m trying to incorporate biogenic marine emissions in my CMAQ-ISAM v5.3.2 simulations using the ECCAD dataset ( This dataset provides information about the following species: CH2Br2, CH3I, CHBr3 and DMS.

In the cb6r3m_ae7_aq mechanism (CMAQ/ at master · USEPA/CMAQ · GitHub), I was able to find CH3I and DMS species, but not CH2Br2 and CHBr3. So, I was wondering what would happen with these two species that I could not find in the chemical mechanism.

1 Like

cb6r3m_ae7_kmtbr contains several halogen species including CH2Br2, CHBr3, DMS, CH3I. However, CH2B2 is named as MB2 and CHBr3 is named as MB3. You can incorporate off-line biogenic marine emissions in your simulations. To avoid double counting, you can turn-off the calculation of inline emissions of these species by revising MGEMIS.F. Please let me know if you have any more questions.

Golam Sarwar


Thank you very much for clarifying that. I appreciate a lot.