OPEN ACCESS

Articles online

Contribution of Biomass Burning to Carbonaceous Aerosols in Mexico City during May 2013

Category: Urban Air Quality

Volume: 16 | Issue: 1 | Pages: 114-124
DOI: 10.4209/aaqr.2015.01.0030
PDF | RIS | BibTeX

Zitely A. Tzompa-Sosa1, Amy P. Sullivan1, Armando Retama2, Sonia M. Kreidenweis 1

  • 1 Department of Atmospheric Science, Colorado State University, 3915 W. Laporte Ave., Fort Collins, CO 80523, USA
  • 2 Direccion de Monitoreo Atmosferico, Secretaria del Medio Ambiente, Gobierno del Distrito Federal, Avenida Tlaxcoaque #8, Sexto Piso, Colonia Centro, Delegacion Cuauhtemoc, Distrito Federal, 06090, Mexico

Highlights

Springtime fires contribute significantly to ambient WSOC and PM in MCMA.
May 2013 was a particularly active fire month in Mexico. 
Wildfires and agricultural burning were the main biomass burning sources. 
Biomass burning tracers were strongly correlated with ambient concentrations of PM. 
Estimated contributions of biomass burning to WSOC ranged from 7–57%.


Abstract

During the springtime fire season, wildfires and agricultural burning represent a potentially large contribution to air quality degradation in the Mexico City Metropolitan Area (MCMA). PM10 filter samples were collected at six different stations in May 2013, the month with the maximum reported regional fire counts from 2002 to 2013. Two regimes were identified considering changes in predominant wind direction and precipitation patterns inside MCMA. The filter samples were analyzed for water-soluble organic carbon (WSOC) and the biomass burning tracers including levoglucosan (LEV) and water-soluble potassium (WSK+). LEV concentrations correlated positively with ambient concentrations of PM2.5 and PM10 (R2 = 0.61 and R2 = 0.46, respectively). Strong correlations were also found between WSOC and LEV (R2 = 0.94) and between WSK+ and LEV (R2 = 0.75). PM2.5 accounted for 60% of the PM10 mass concentrations. Our speciated measurements accounted for 37% of the total PM10 mass concentration and ~60% of the PM2.5 mass concentrations; the missing mass was attributed to crustal material (soil or dust) and carbonaceous aerosols that were not segregated into the WSOC fraction. Average LEV/WSOC ratios ranged from 0.015 in the first, smokier and drier part of the month, to 0.006 during the rainier end of the measurement period. Using previously reported LEV/WSOC emissions ratios, the estimated biomass burning contributions to WSOC ranged from 7–23% assuming LEV is stable in the atmosphere, and 8–57% when accounting for LEV photochemical degradation in the atmosphere. Thus, our findings indicate that primary emissions from biomass burning sources represent significant contributions to ambient WSOC and PM in MCMA during the springtime fire season.

Keywords

Levoglucosan Water-soluble organic carbon Potassium Air quality


Related Article

Vertical Ozone Concentration Profiles in the Arabian Gulf Region during Summer and Winter: Sensitivity of WRF-Chem to Planetary Boundary Layer Schemes

Christos Fountoukis , Mohammed A. Ayoub, Luis Ackermann, Daniel Perez-Astudillo, Dunia Bachour, Ivan Gladich, Ross D. Hoehn

On the Morphology and Composition of Particulate Matter in an Urban Environment

Bahadar Bahadar Zeb, Khan Khan Alam , Armin Armin Sorooshian, Thomas Blaschke, Ifthikhar Ahmad, Imran Shahid
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.09.0340
PDF

Concentration of Ultrafine Particles near Roadways in An Urban Area in Chicago, Illinois

Sheng Xiang, Zhice Hu, Wenjuan Zhai, Dongqi Wen, Kenneth E. Noll
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.09.0347
PDF

Spatial Characterization of Black Carbon Mass Concentration in the Atmosphere of a Southeast Asian Megacity: An Air Quality Case Study for Metro Manila, Philippines

Honey Dawn Alas , Thomas Müller, Wolfram Birmili, Simonas Kecorius, Maria Obiminda Cambaliza, James Bernard B. Simpas, Mylene Cayetano, Kay Weinhold, Edgar Vallar, Maria Cecilia Galvez, Alfred Wiedensohler
;