摘要:

Organic aerosol (OA) in the atmosphere consists of a multitude of organic species which are either directly emitted or the products of a variety of chemical reactions. This complexity challenges our ability to explicitly characterize the chemical composition of these particles. We find that the bulk composition of OA from a variety of environments (laboratory and field) occupies a narrow range in the space of a Van Krevelen diagram (H: C versus O:C), characterized by a slope of similar to-1. The data show that atmospheric aging, involving processes such as volatilization, oxidation, mixing of air masses or condensation of further products, is consistent with movement along this line, producing a more oxidized aerosol. This finding has implications for our understanding of the evolution of atmospheric OA and representation of these processes in models. Citation: Heald, C. L., J. H. Kroll, J. L. Jimenez, K. S. Docherty, P. F. DeCarlo, A. C. Aiken, Q. Chen, S. T. Martin, D. K. Farmer, and P. Artaxo (2010), A simplified description of the evolution of organic aerosol composition in the atmosphere, Geophys. Res. Lett., 37, L08803, doi: 10.1029/2010GL042737.

附注:

ISI Document Delivery No.: 587YPTimes Cited: 0Cited Reference Count: 27Heald, C. L. Kroll, J. H. Jimenez, J. L. Docherty, K. S. DeCarlo, P. F. Aiken, A. C. Chen, Q. Martin, S. T. Farmer, D. K. Artaxo, P.Nsf [atm-0929282, atm-0449815, atm-0723582]; noaa [na08oar4310565]Authors C. L. Heald and J. H. Kroll contributed equally to this work. This work was supported in part by NSF grants ATM-0929282, ATM-0449815, and ATM-0723582 and NOAA grant NA08OAR4310565. We thank A. J. Weinheimer (NCAR) for providing the MILAGRO NOx/NOy observations.Amer geophysical unionWashington