Chemically Resolved Particle Fluxes Over Tropical and Temperate Forests. Farmer, D., K., Chen, Q., Kimmel, J., R., Docherty, K., S., Nemitz, E., Artaxo, P., a., Cappa, C., D., Martin, S., T., & Jimenez, J., L. Aerosol Science and Technology, 47(7):818-830, 7, 2013.
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Chemically resolved submicron (PM1) particle mass fluxes were measured\nby eddy covariance with a high resolution time-of-flight aerosol mass\nspectrometer over temperate and tropical forests during the BEARPEX-07\nand AMAZE-08 campaigns. Fluxes during AMAZE-08 were small and close to\nthe detection limit (<1ng m(-2) s(-1)) due to low particle mass\nconcentrations (<1g m(-3)). During BEARPEX-07, concentrations were five\ntimes larger, with mean mid-day deposition fluxes of -4.8ng m(-2) s(-1)\nfor total nonrefractory PM1 (V-ex,V-PM1 = -1mm s(-1)) and emission\nfluxes of +2.6ng m(-2) s(-1) for organic PM1 (V-ex,V-org = +1mm s(-1)).\nBiosphere-atmosphere fluxes of different chemical components are\naffected by in-canopy chemistry, vertical gradients in gas-particle\npartitioning due to canopy temperature gradients, emission of primary\nbiological aerosol particles, and wet and dry deposition. As a result of\nthese competing processes, individual chemical components had fluxes of\nvarying magnitude and direction during both campaigns. Oxygenated\norganic components representing regionally aged aerosol deposited, while\ncomponents of fresh secondary organic aerosol (SOA) emitted. During\nBEARPEX-07, rapid in-canopy oxidation caused rapid SOA growth on the\ntimescale of biosphere-atmosphere exchange. In-canopy SOA mass yields\nwere 0.5-4%. During AMAZE-08, the net organic aerosol flux was\ninfluenced by deposition, in-canopy SOA formation, and thermal shifts in\ngas-particle partitioning. Wet deposition was estimated to be an order\nof magnitude larger than dry deposition during AMAZE-08. Small shifts in\norganic aerosol concentrations from anthropogenic sources such as urban\npollution or biomass burning alters the balance between flux terms. The\nsemivolatile nature of the Amazonian organic aerosol suggests a feedback\nin which warmer temperatures will partition SOA to the gas-phase,\nreducing their light scattering and thus potential to cool the region.\nCopyright 2013 American Association for Aerosol Research
@article{
 title = {Chemically Resolved Particle Fluxes Over Tropical and Temperate Forests},
 type = {article},
 year = {2013},
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 pages = {818-830},
 volume = {47},
 websites = {http://www.tandfonline.com/doi/abs/10.1080/02786826.2013.791022},
 month = {7},
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 abstract = {Chemically resolved submicron (PM1) particle mass fluxes were measured\nby eddy covariance with a high resolution time-of-flight aerosol mass\nspectrometer over temperate and tropical forests during the BEARPEX-07\nand AMAZE-08 campaigns. Fluxes during AMAZE-08 were small and close to\nthe detection limit (<1ng m(-2) s(-1)) due to low particle mass\nconcentrations (<1g m(-3)). During BEARPEX-07, concentrations were five\ntimes larger, with mean mid-day deposition fluxes of -4.8ng m(-2) s(-1)\nfor total nonrefractory PM1 (V-ex,V-PM1 = -1mm s(-1)) and emission\nfluxes of +2.6ng m(-2) s(-1) for organic PM1 (V-ex,V-org = +1mm s(-1)).\nBiosphere-atmosphere fluxes of different chemical components are\naffected by in-canopy chemistry, vertical gradients in gas-particle\npartitioning due to canopy temperature gradients, emission of primary\nbiological aerosol particles, and wet and dry deposition. As a result of\nthese competing processes, individual chemical components had fluxes of\nvarying magnitude and direction during both campaigns. Oxygenated\norganic components representing regionally aged aerosol deposited, while\ncomponents of fresh secondary organic aerosol (SOA) emitted. During\nBEARPEX-07, rapid in-canopy oxidation caused rapid SOA growth on the\ntimescale of biosphere-atmosphere exchange. In-canopy SOA mass yields\nwere 0.5-4%. During AMAZE-08, the net organic aerosol flux was\ninfluenced by deposition, in-canopy SOA formation, and thermal shifts in\ngas-particle partitioning. Wet deposition was estimated to be an order\nof magnitude larger than dry deposition during AMAZE-08. Small shifts in\norganic aerosol concentrations from anthropogenic sources such as urban\npollution or biomass burning alters the balance between flux terms. The\nsemivolatile nature of the Amazonian organic aerosol suggests a feedback\nin which warmer temperatures will partition SOA to the gas-phase,\nreducing their light scattering and thus potential to cool the region.\nCopyright 2013 American Association for Aerosol Research},
 bibtype = {article},
 author = {Farmer, Delphine K. and Chen, Qi and Kimmel, Joel R. and Docherty, Kenneth S. and Nemitz, Eiko and Artaxo, Paulo a. and Cappa, Christopher D. and Martin, Scot T. and Jimenez, Jose L.},
 journal = {Aerosol Science and Technology},
 number = {7}
}
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