Photoxidation products of alpha- pinene: Role of terpenes in cloud nucleation PASI Workshop Caltech, Pasadena Jan 16,2004.

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Presentation transcript:

Photoxidation products of alpha- pinene: Role of terpenes in cloud nucleation PASI Workshop Caltech, Pasadena Jan 16,2004

Why does it rain in the rainforest?

The importance of this project is to generate thermodynamical data (i.e: equilibrium constant and enthropy change) to understand the role of monoterpenes in cloud nucleation over conifer forests. The importance of this project is to generate thermodynamical data (i.e: equilibrium constant and enthropy change) to understand the role of monoterpenes in cloud nucleation over conifer forests.

Outline Background info. Background info. Results Results Conclusions Conclusions Acknowledgements Acknowledgements

Background info. Terrestrial vegetation releases terpenes Terrestrial vegetation releases terpenes to the atmosphere Monoterpenes are highly reactive and undergo free- radical addition with O 3 Monoterpenes are highly reactive and undergo free- radical addition with O 3 Photo-oxidations of terpenes and isoprene yield products, which partially remain in the gas phase Photo-oxidations of terpenes and isoprene yield products, which partially remain in the gas phase Some less volatile photo-oxidation products partition between the gas phase and particulate phases, accumulate in the condense phase and, thus contribute to the ambient particulate mass. Some less volatile photo-oxidation products partition between the gas phase and particulate phases, accumulate in the condense phase and, thus contribute to the ambient particulate mass.

More background info……. Alpha and beta pinene are typical biogenic terpenes produced over conifer forests. Alpha and beta pinene are typical biogenic terpenes produced over conifer forests. Their photoxidation products are thought to play an important role in nucleation of water. Their photoxidation products are thought to play an important role in nucleation of water.

Pinonic Acid Pinonic acid is formed by photoxidation of alpha-pinene in presence of ozone Pinonic acid is formed by photoxidation of alpha-pinene in presence of ozone DATA DATA Formula: C 10 H 16 O 3 Molecular Weight: ∆Gº=Gº pinonic - (Gº a-pinene +Gº ozone ) Keq= e -∆Gº/RT

Pinic Acid Pinic acid is formed by photoxidation of alpha-pinene in presence of ozone Pinic acid is formed by photoxidation of alpha-pinene in presence of ozone DATA DATA Formula: C 9 H 14 O 4 C 10 H /3O 3 C 9 H 14 O 4 + HCHO ∆Gº=Gº pinic- (Gº a-pinene+5/3Gº ozone)

Chemical Equilibrium Constants Kp(T)

Frequency calculations utilizing HF Basis set: 6-31G* Geometry Optimization utilizing Force Fields UFF Geometry Optimization utilizing DFT Becke 3:P86 Basis set: 6-311G** Data treatment

Method validation Molecule S°gas,1 atm theoretical (cal/molK) 1 S°gas,1 atm experimental (cal/molK)Error% H2OH2OH2OH2O % CO % 1 NIST

Results Equilibrium constant for trans- and cis-pinonic acid and cis-pinic acid

∆S for trans- and cis-pinonic acid and cis-pinic acid ∆S for trans- and cis-pinonic acid and cis-pinic acid Results

Conclusions Pinic acid is more abundant than any pinonic acid isomer due to its higher equilibrium constant, as reported by Jenkin (2000) Pinic acid is more abundant than any pinonic acid isomer due to its higher equilibrium constant, as reported by Jenkin (2000) Cis-pinonic acid is more abundant than trans-pinonic acid because its equilibrium constant is higher. This data coincides with a study made by O’Dowd (2002) Cis-pinonic acid is more abundant than trans-pinonic acid because its equilibrium constant is higher. This data coincides with a study made by O’Dowd (2002) The enthropy change of the photoxidation of alpha-pinene to yield pinic and pinonic acid is negative due to the reduction of number of free molecules (i.e: ozone). The process enthropy for the formation of the cis- product is higher due to steric hinderance. It’s lower for pinic acid because of the stoichiometry of the reaction. The enthropy change of the photoxidation of alpha-pinene to yield pinic and pinonic acid is negative due to the reduction of number of free molecules (i.e: ozone). The process enthropy for the formation of the cis- product is higher due to steric hinderance. It’s lower for pinic acid because of the stoichiometry of the reaction.

Future studies Calculate the thermodynamical data for trans- pinic acid. Calculate the thermodynamical data for trans- pinic acid. Calculate the thermodynamical data for other subproducts of the photoxidation of alpha- pinene and beta-pinene. Calculate the thermodynamical data for other subproducts of the photoxidation of alpha- pinene and beta-pinene. Study the role of the major subproducts in cloud nucleation. Study the role of the major subproducts in cloud nucleation.

References O'Dowd, C.D., Aalto, P., Hameri, K., Kulmala, M. and Hoffmann, T Atmospheric particles from organic vapours. Nature 416: O'Dowd, C.D., Aalto, P., Hameri, K., Kulmala, M. and Hoffmann, T Atmospheric particles from organic vapours. Nature 416: Jenkin, M.E., Shallcross, D.E. and Harvey, J.N Development and application of a possible mechanism for the generation of cis-pinonic acid from the ozonolysis of alpha and beta-pinene. Atmospheric Environment 34: Jenkin, M.E., Shallcross, D.E. and Harvey, J.N Development and application of a possible mechanism for the generation of cis-pinonic acid from the ozonolysis of alpha and beta-pinene. Atmospheric Environment 34:

Acknowledgements We would like to thank: We would like to thank: –Dr. Mario Blanco from Caltech –Dr. Sergio Aragon from UCSF –NSF