Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site

Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site. Chen, H., Hodshire, A., A., L., Ortega, J., Greenberg, J., McMurry, P., P., H., Carlton, A., A., G., Pierce, J., J., R., Hanson, D., R., D., & Smith, J., N., J. Atmospheric Chemistry and Physics, 18(1):311-326, 2018.

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Most prior field studies of new particle formation (NPF) have been performed at or near ground level, leaving many unanswered questions regarding the vertical extent of NPF. To address this, we measured concentrations of 11-16 nm diameter particles from ground level to 1000m during the 2013 New Particle Formation Study at the Atmospheric Radiation Measurement Southern Great Plains site in Lamont, Oklahoma. The measurements were performed using a tethered balloon carrying two condensation particle counters that were configured for two different particle cut-off diameters. These observations were compared to data from three scanning mobility particle sizers at the ground level. We observed that 11-16 nm diameter particles were generated at the top region of the boundary layer, and were then rapidly mixed throughout the boundary layer. We also estimate liquid water content of nanoparticles using ground-based measurements of particle hygroscopicity obtained with a Humidified Tandem Differential Mobility Analyzer and vertically resolved relative humidity (RH) and temperature measured with a Raman lidar. Our analyses of these observations lead to the following conclusions regarding nanoparticles formed during NPF events at this site: (1) ground-based observations may not always accurately represent the timing, distribution, and meteorological conditions associated with the onset of NPF; (2) nanoparticles are highly hygroscopic and typically contain up to 50% water by volume, and during conditions of high RH combined with high particle hygroscopicity, particles can be up to 95%water by volume; (3) increased liquid water content of nanoparticles at high RH greatly enhances the partitioning of water-soluble species like organic acids into ambient nanoparticles.

@article{
 title = {Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site},
 type = {article},
 year = {2018},
 pages = {311-326},
 volume = {18},
 websites = {https://www.atmos-chem-phys-discuss.net/acp-2017-586/},
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 created = {2023-01-31T22:46:08.166Z},
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 last_modified = {2023-01-31T22:46:08.166Z},
 read = {false},
 starred = {false},
 authored = {true},
 confirmed = {true},
 hidden = {false},
 citation_key = {Chen2018},
 source_type = {JOUR},
 notes = {<b>From Duplicate 1 (<i>Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site</i> - Chen, Haihan; Hodshire, Anna L.; Ortega, John; Greenberg, James; McMurry, Peter H.; Carlton, Annmarie G.; Pierce, Jeffrey R.; Hanson, Dave R.; Smith, James N.)<br/></b><br/>ACPD},
 private_publication = {false},
 abstract = {Most prior field studies of new particle formation (NPF) have been performed at or near ground level, leaving many unanswered questions regarding the vertical extent of NPF. To address this, we measured concentrations of 11-16 nm diameter particles from ground level to 1000m during the 2013 New Particle Formation Study at the Atmospheric Radiation Measurement Southern Great Plains site in Lamont, Oklahoma. The measurements were performed using a tethered balloon carrying two condensation particle counters that were configured for two different particle cut-off diameters. These observations were compared to data from three scanning mobility particle sizers at the ground level. We observed that 11-16 nm diameter particles were generated at the top region of the boundary layer, and were then rapidly mixed throughout the boundary layer. We also estimate liquid water content of nanoparticles using ground-based measurements of particle hygroscopicity obtained with a Humidified Tandem Differential Mobility Analyzer and vertically resolved relative humidity (RH) and temperature measured with a Raman lidar. Our analyses of these observations lead to the following conclusions regarding nanoparticles formed during NPF events at this site: (1) ground-based observations may not always accurately represent the timing, distribution, and meteorological conditions associated with the onset of NPF; (2) nanoparticles are highly hygroscopic and typically contain up to 50% water by volume, and during conditions of high RH combined with high particle hygroscopicity, particles can be up to 95%water by volume; (3) increased liquid water content of nanoparticles at high RH greatly enhances the partitioning of water-soluble species like organic acids into ambient nanoparticles.},
 bibtype = {article},
 author = {Chen, Haihan and Hodshire, A.L. Anna L. and Ortega, John and Greenberg, James and McMurry, P.H. Peter H. and Carlton, A.G. Annmarie G. and Pierce, J.R. Jeffrey R. and Hanson, Dave R. D.R. and Smith, James N. J.N.},
 doi = {10.5194/acp-18-311-2018},
 journal = {Atmospheric Chemistry and Physics},
 number = {1}
}

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