Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene

Detailed organic analysis of natural aerosols from the Amazonian rain forest showed considerable quantities of previously unobserved polar organic compounds, which were identified as a mixture of two diastereoisomeric 2-methyltetrols: 2-methylthreitol and 2-methylerythritol. These polyols, which have the isoprene skeleton, can be explained by OH radical–initiated photooxidation of isoprene. They have low vapor pressure, allowing them to condense onto preexisting particles. It is estimated that photooxidation of isoprene results in an annual global production of about 2 teragrams of the polyols, a substantial fraction of the Intergovernmental Panel on Climate Change estimate of between 8 and 40 teragrams per year of secondary organic aerosol from biogenic sources.

[1]  F. Went.  Blue Hazes in the Atmosphere , 1960, Nature.

[2]  D. Smith,et al.  SUGAR ALCOHOLS (POLYOLS) IN FUNGI AND GREEN PLANTS , 1967 .

[3]  W. Carter,et al.  Kinetics and mechanisms of the gas-phase reactions of ozone with organic compounds under atmospheric conditions , 1984 .

[4]  H. Buchan,et al.  Tropospheric nitric oxide measurements over the Amazon Basin , 1988 .

[5]  Y. Marcus,et al.  Water sorption, binding and solubility of polyols , 1993 .

[6]  J. Penner,et al.  Large contribution of organic aerosols to cloud-condensation-nuclei concentrations , 1993, Nature.

[7]  C. N. Hewitt,et al.  A global model of natural volatile organic compound emissions , 1995 .

[8]  M. Hayashi,et al.  Water soluble dicarboxylic acids and related compounds in Antarctic aerosols , 1996 .

[9]  P. Saxena,et al.  Water-soluble organics in atmospheric particles: A critical review of the literature and application of thermodynamics to identify candidate compounds , 1996 .

[10]  J. Seinfeld,et al.  Atmospheric Chemistry and Physics: From Air Pollution to Climate Change , 1997 .

[11]  P. Crutzen,et al.  Atmospheric aerosols: Biogeochemical sources and role in atmospheric chemistry , 1997 .

[12]  Frank M. Bowman,et al.  Formation of Organic Aerosols from the Oxidation of Biogenic Hydrocarbons , 1997 .

[13]  Thorsten Hoffmann,et al.  Molecular composition of organic aerosols formed in the α‐pinene/O3 reaction: Implications for new particle formation processes , 1998 .

[14]  N. Mihalopoulos,et al.  Formation of atmospheric particles from organic acids produced by forests , 1998, Nature.

[15]  Christopher G. Nolte,et al.  Levoglucosan, a tracer for cellulose in biomass burning and atmospheric particles , 1999 .

[16]  Shao-Meng Li,et al.  A case study of gas-to-particle conversion in an eastern Canadian forest , 1999 .

[17]  M. Andreae,et al.  Atmospheric volatile organic compounds (VOC) at a remote tropical forest site in central Amazonia , 2000 .

[18]  K. Becker,et al.  A product study of the OH radical-initiated oxidation of isoprene: formation of C5-unsaturated diols , 2000 .

[19]  Jingchuan Zhou,et al.  Cloud condensation nuclei in the Amazon Basin: “marine” conditions over a continent? , 2001 .

[20]  M. Claeys,et al.  Improved method for quantifying levoglucosan and related monosaccharide anhydrides in atmospheric aerosols and application to samples from urban and tropical locations. , 2002, Environmental science & technology.

[21]  E. Stephanou,et al.  Direct evidence of atmospheric secondary organic aerosol formation in forest atmosphere through heteromolecular nucleation. , 2002, Environmental science & technology.

[22]  J. Houghton,et al.  Climate change 2001 : the scientific basis , 2001 .

[23]  M. Facchini,et al.  Water‐soluble organic compounds in biomass burning aerosols over Amazonia 1. Characterization by NMR and GC‐MS , 2002 .

[24]  H. Hansson,et al.  Submicrometer aerosol particle size distribution and hygroscopic growth measured in the Amazon rain forest during the wet season , 2002 .

[25]  R. Flagan,et al.  Organic compounds present in the natural Amazonian aerosol: Characterization by gas chromatography–mass spectrometry , 2003 .

[26]  H. Geiger,et al.  The tropospheric degradation of isoprene : an updated module for the regional atmospheric chemistry mechanism , 2003 .

[27]  Andreas Limbeck,et al.  Secondary organic aerosol formation in the atmosphere via heterogeneous reaction of gaseous isoprene on acidic particles , 2003 .

[28]  L. Fuß.  The Impact of Telecoms on Economic Growth in Developing Countries , 2005 .