Characterization of winter organic aerosols in Beijing, China

Mar 05, 2012
These graphs show mass spectrum (left) and time series (right) of OA components during the observation period. Credit: ┬ęScience China Press

Organic aerosol (OA) is a crucial component of atmospheric fine particles. To achieve a better understanding of the sources of OA is very significant for air pollution control. In the 2012, Vol 57(7) of Chinese Science Bulletin, a paper identified three main sources of submicron OA in Beijing winter of 2010 with a high-resolution time-of-flight aerosol mass spectrometer. It provides a new effective strategy for moderating the fine particles pollution of Beijing.

Because submicron particulates (PM1) exhibit lengthy atmospheric and are capable of deep pulmonary ingestion, the environmental and health impacts of PM1 are very significant. Organic aerosol is a large and important fraction of PM1 and has great impact on human health, especially because of some of the compounds have proved to be mutagens or carcinogens. Along with fast economical growth, the air quality in Beijing has suffered severe deterioration, with PM being one of the top pollutants. Organic matter is the most abundant fraction in in Beijing, accounting for 30-50% of the total mass, indicating its key role in . Because the chemical compositions and sources of OA are complex (they can be classified as either primary OA (POA), from direct emissions, or secondary OA (SOA), from the oxidation of gas-phase precursors), the related studies on their chemical and physical characteristics have become difficult and a recent focus point. High time-resolution online measurements are needed to gain insight into aerosol chemical characteristics, sources and processes.

Professor Wang Yuesi and Dr. Liu Quan from State Key Laboratory of Atmospheric Boundary Layer Physics and , Institute of , performed the online observation of chemical compositions and size distributions of OA with a HR-ToF-AMS to reveal the variation regularity of organic aerosols in Bejing winter. Meanwhile, based on the data of the mass spectra of organic compounds, major sources of OA were resolved by positive matrix factorisation (PMF). Their work, entitled "In situ measurement of PM1 organic aerosol in Beijing winter using a high-resolution aerosol ", was published in Chinese Science Bulletin, 2012, Vol 57(7).

The mean OA mass concentration was 20.9±25.3 μg/m3 during this campaign, varying between 1.9 and 284.6 μg/m3. The average mass-based size distributions of OA present a prominent accumulation mode peaking at approximately 450 nm. During this study, the average H/C, O/C and N/C (molar ratio) were 1.70, 0.17, and 0.005, respectively, corresponding to an OM/OC ratio (mass ratio of organic matter to organic carbon) of 1.37. The diurnal pattern of O/C was consistent with that of OM/OC and displayed a typical photochemical characteristic.

Positive Matrix Factorisation (PMF) analysis of the organic mass spectral dataset differentiated the OA into three components (Figure 1): hydrocarbon-like (HOA), cooking-related (COA), and oxygenated (OOA) , which, on average, accounted for 26.9%, 49.7% and 23.4%, respectively. The sum of HOA and COA could be regarded as POA, and the OOA corresponded to aged SOA. The POA is a dominant component of OA in Beijing winter, with a large percentage of 76.6%. The large contribution of COA in the POA mass indicates its key role in PM1 in Beijing.

Explore further: Research charts the ecological impact of microbial respiration in the oxygen-starved ocean

More information: Liu Quan, Sun Yang, Hu Bo et al. In situ measurement of PM1 organic aerosol in Beijing winter using a high-resolution aerosol Mass Spectrometer. Chinese Science Bulletin, 2012, 57 (7): 819-826.

add to favorites email to friend print save as pdf

Related Stories

New evidence of the power of open access

Oct 18, 2010

New findings settle one of the arguments about Open Access (OA) research publications: Are they more likely to be cited because they were made OA, or were they made OA because they were more likely to be cited?

Recommended for you

Fires in the Northern Territories July 2014

48 minutes ago

Environment Canada has issued a high health risk warning for Yellowknife and surrounding area because of heavy smoke in the region due to forest fires. In the image taken by the Aqua satellite, the smoke ...

How much magma is hiding beneath our feet?

1 hour ago

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits. Our understanding of these phenomena ...

Oso disaster had its roots in earlier landslides

4 hours ago

The disastrous March 22 landslide that killed 43 people in the rural Washington state community of Oso involved the "remobilization" of a 2006 landslide on the same hillside, a new federally sponsored geological study concludes.

User comments : 0