Air Quality Impacts of Biomass Burning Transport During the 2019 CAMP2Ex Using MUSICAv0 with Regional Refinement over Southeast Asia

The Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP²Ex) captured significant biomass burning transport from the Maritime Continent (MC) from August to October 2019 through a combination of the NASA P3 in-situ and remote sensing flights over West Philippine Sea, high temporal resolution Advanced Himawari Imager (AHI) Aerosol Optical Depth (AOD) retrievals and ground-based measurements. The MC burning remains a challenge for remote sensing due to persistent cloud cover in the region especially during the peak burning season in September. To better understand its air quality impacts, we conducted simulations of Multi-Scale Infrastructure for Chemistry and Aerosols (MUSICAv0) with high resolution over southeast Asia. A variable resolution grid with regional refinement of ne30x8 or ~14 km resolution over the MC (10S to 25N and 96 to 133E) was created to capture the burning events and their regional air quality impacts. Further refinement of ne30x16 or ~7 km resolution over Luzon Island, Philippines was also included to examine urban air quality and also to take advantage of the supersite at the Manila Observatory (MO) and the NASA P3 missed approach flight over the megacity Metro Manila during the campaign. The 3-month simulation of aerosol distributions, simulated using specified oxidants, are evaluated and verified with the high temporal (10-minute) AHI AOD retrievals, and aircraft in-situ and remotely-sensed extinction vertical profiles from the Langley Aerosol Research Group (LARGE) suite of instruments and the High Spectral Resolution Lidar-2 (HSRL-2), respectively. Ground-based HSRL measurements at MO in combination with PM_2.5 measurements are also used for validation. Future work includes using a MUSICAv0 configuration with a more comprehensive chemical mechanism, imposing a diurnal profile for the fire emissions based on AHI Fire Radiative Power measurements over the burning and incorporating the ~400 m resolution VIIRS day-night band nighttime light radiances in downscaling the anthropogenic emissions.