Temporal variations of aerosol components in Tijuana, Mexico, during the Cal-Mex campaign S. Takahama, A. Johnson, J. Guzman Morales, L.M. Russell Scripps.

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Presentation transcript:

Temporal variations of aerosol components in Tijuana, Mexico, during the Cal-Mex campaign S. Takahama, A. Johnson, J. Guzman Morales, L.M. Russell Scripps Institution of Oceanography, University of California San Diego R. Duran, A. Cortez, B. Puckita, G. Rodríguez Universidad de Autónoma de Baja California, Tijuana R. Subramanian Droplet Measurement Technologies, Inc. D. Toom-Sauntry, R. Leaitch Science & Technology Branch, Environment Canada

Measurement of submicron aerosol composition and concentrations in Tijuana, Mexico 2

Instrument: Aerosol Chemical Speciation Monitor (ACSM) Measures: submicron non-refractory inorganic ion and organic molecular fragment concentrations Time resolution: min Instrument: Single Particle Soot Photometer (SP2) Measures: black carbon mass and number Time resolution: single particle Instrument: Fourier Transform Infrared Spectroscopy (FTIR) Measures: submicron organic functional group concentrations Time resolution: 6-12 hours Measurements of BC, organic, and NR inorganic aerosol 3

Tijuana: 4.0 μg/m 3 Zhang et al., NR-PM 1 Composition similar to S. California May 15 - June 30

Temporal variations in non-refractory PM 1 (Parque Morelos, May 15-June 30, ACSM)

Organic Functional Groups by FTIR 6 o Peak area is proportional to the moles of bond on the sample filter. o Proportionality constant varies with each functional group and is calibrated in the laboratory. Primary Amine (CNH 2 ) Organic Nitrate (CONO 2 ) Organic hydroxyl or alcohol (COH) Carbonyl (C=O) Alkane and alkene (C-CH, C=C-H) OH O NH 2 O NO 2 “fictitious” organic molecule HO H H C O NO 2 O

Functional group composition in Tijuana resembles composition observed in other urban areas. Distinctly different from average composition of samples collected in non- urban areas.

Generally uniform composition throughout, except during low- concentration periods. Weekday and weekend composition is similar with a few exceptions. Weekly variations in functional group composition 8

Potential sources of organic functional groups

POSITIVE MATRIX FACTORIZATION Factor Factor 2 Factor 3 Biomass burning Dust Oil combustion Observed variable and uncertainty e.g. Absorbance spectrum representing organic functional groups PMF Adapted from S. Liu From functional group composition and correlations to other variables…. (K, levoglucosan) (Ca, Si, Fe, Al) (V, Ni, Fe, S) 10

PMF factors Fossil-fuel combustion 1 Less oxygenated (S, V) 2 More oxygenated (S) Burning Correlated with K Marine Correlated with Na, Cl

Components from FTIR spectra decomposition

Temporal variations in BC number concentrations Peak during morning hours daily Extreme values during weekend evenings

BC emission events during evening hours Evening areas shaded in grey (10pm to 3am)

Association of black carbon with sources of organic PM Black carbon number concentrations correlate with organic aerosol measurements from ACSM on weekday mornings and weekend evenings. BC number concentrations also correlate with FTIR-PMF (Positive Matrix Factorization on FTIR spectra) combustion factor/component on on weekday mornings and FTIR-PMF Burning factor/component on weekend evenings.

Correlation of BC number concentrations with ACSM mass fragments (markers) Mass fragments: m/z 57, 60, 73 often associated with biomass burning. These mass fragments correlate strongest with BC number concentrations during weekend evenings.

Shape and chemical distribution with X-ray microscopy 17

Particle types Black carbon particles Acid-dominated Acid-dust mixtures Particle typeNumberSize range (mean) μm Acid-dominated61.4–4.6 (2.6) Acid-dust mixtures151–3.5 (2.1) Black carbon180.2–3.1 (1.5)

Conclusions Overall NR-PM 1 composition resembles observations made in S. California. Overall functional group composition resembles observations in other urban areas (Mexico City, Houston). Diurnal variations between weekday and weekend periods did not vary significantly. NR-PM 1 (including organic, ammonium, and nitrate) concentrations peaked in the morning. BC number concentrations also peaked in the morning. BC sources were associated with traffic and biomass burning events.