An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado

An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado. Levin, E., J., T., Prenni, A., J., Petters, M., D., Kreidenweis, S., M., Sullivan, R., C., Atwood, S., A., Ortega, J., Demott, P., J., & Smith, J., N. Journal of Geophysical Research, 117(D6):n/a-n/a, 2012.

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The ability of particles composed wholly or partially of biogenic secondary organic compounds to serve as cloud condensation nuclei (CCN) is a key characteristic that helps to define their roles in linking biogeochemical and water cycles. In this paper, we describe size-resolved (14-350 nm) CCN measurements from the Manitou Experimental Forest in Colorado, where particle compositions were expected to have a large biogenic component. These measurements were conducted for 1 year as part of the Bio-hydro-atmosphere Interactions of Energy, Aerosols, Carbon, H2O, Organics, and Nitrogen program and determined the aerosol hygroscopicity parameter, kappa, at five water supersaturations between similar to 0.14% and similar to 0.97%. The average kappa value over the entire study and all supersaturations was kappa(avg) = 0.16 +/- 0.08. Kappa values decreased slightly with increasing supersaturation, suggesting a change in aerosol composition with dry diameter. Furthermore, some seasonal variability was observed with increased CCN concentrations and activated particle number fraction, but slightly decreased hygroscopicity, during the summer. Small particle events, which may indicate new particle formation, were observed throughout the study period, especially in the summer, leading to increases in CCN concentration, followed by a gradual increase in the aerosol mode size. The condensing material appeared to be predominantly composed of organic compounds and led to a small decrease in k at the larger activation diameters during and immediately after those events.

@article{
 title = {An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado},
 type = {article},
 year = {2012},
 keywords = {CCN,aerosol,biogenic aerosol,hygroscopicity},
 pages = {n/a-n/a},
 volume = {117},
 websites = {papers://83c86942-09e3-4e62-b4f3-4d7a6ecab78b/Paper/p1459},
 id = {0296a9d2-2751-3c3c-8e16-a725df1002cc},
 created = {2023-01-31T22:46:08.255Z},
 file_attached = {false},
 profile_id = {2e2b0bf1-6573-3fd8-8628-55d1dc39fe31},
 last_modified = {2023-01-31T22:46:08.255Z},
 read = {false},
 starred = {false},
 authored = {true},
 confirmed = {true},
 hidden = {false},
 citation_key = {Levin2012},
 source_type = {Journal Article},
 notes = {<b>From Duplicate 1 (<i>An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado</i> - Levin, E; Prenni, a; Petters, M; Kreidenweis, S; Sullivan, R; Atwood, S; Ortega, J; Demott, P; Smith, J)<br/></b><br/>Times Cited: 24},
 private_publication = {false},
 abstract = {The ability of particles composed wholly or partially of biogenic secondary organic compounds to serve as cloud condensation nuclei (CCN) is a key characteristic that helps to define their roles in linking biogeochemical and water cycles. In this paper, we describe size-resolved (14-350 nm) CCN measurements from the Manitou Experimental Forest in Colorado, where particle compositions were expected to have a large biogenic component. These measurements were conducted for 1 year as part of the Bio-hydro-atmosphere Interactions of Energy, Aerosols, Carbon, H2O, Organics, and Nitrogen program and determined the aerosol hygroscopicity parameter, kappa, at five water supersaturations between similar to 0.14% and similar to 0.97%. The average kappa value over the entire study and all supersaturations was kappa(avg) = 0.16 +/- 0.08. Kappa values decreased slightly with increasing supersaturation, suggesting a change in aerosol composition with dry diameter. Furthermore, some seasonal variability was observed with increased CCN concentrations and activated particle number fraction, but slightly decreased hygroscopicity, during the summer. Small particle events, which may indicate new particle formation, were observed throughout the study period, especially in the summer, leading to increases in CCN concentration, followed by a gradual increase in the aerosol mode size. The condensing material appeared to be predominantly composed of organic compounds and led to a small decrease in k at the larger activation diameters during and immediately after those events.},
 bibtype = {article},
 author = {Levin, E. J. T. and Prenni, A. J. and Petters, M. D. and Kreidenweis, S. M. and Sullivan, R. C. and Atwood, S. A. and Ortega, J. and Demott, P. J. and Smith, J. N.},
 doi = {10.1029/2011jd016854},
 journal = {Journal of Geophysical Research},
 number = {D6}
}

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