The role of relative humidity in continental new particle formation. Hamed, A., Korhonen, H., Sihto, S., L., Joutsensaari, J., Jrvinen, H., Petäjä, T., Arnold, F., Nieminen, T., Kulmala, M., Smith, J., N., Lehtinen, K., E., & Laaksonen, A. Journal of Geophysical Research Atmospheres, 116(3):D03202, 2, 2011. ![The role of relative humidity in continental new particle formation [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website doi abstract bibtex Relative humidity (RH) has been observed to be anticorrelated with continental new particle formation. Several reasons have been proposed for this rather surprising finding, but no firm conclusions have been drawn so far. Here we study several of the proposed reasons: Enhanced coagulational scavenging of sub-3 nm clusters at high RH, diminished solar radiation at high RH leading to diminished gas phase oxidation chemistry, and increased condensation sink (CS) of condensable gases due to hygroscopic growth of the preexisting particles. Our theoretical calculations indicate that the increase of coagulational scavenging plays a relatively small role in the inhibition of nucleation at high RH. On the other hand, field data show that the maximum observed gas phase sulphuric acid concentrations are limited to RHs below 60%. The field data also indicate that this is likely due to low OH concentrations at high RH. This finding is also supported by aerosol dynamics model simulations. The model was used to find out whether this is mainly due to decreased source (solar radiation) or increased sink (CS) terms at the elevated RH. The simulation results show that the decreased source term at high RH limits H2SO4 levels in the air, and therefore high new particle formation rates (above ∼1 cm-3 s-1) rarely occur above 80% RH. Copyright 2011 by the American Geophysical Union.
@article{
title = {The role of relative humidity in continental new particle formation},
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year = {2011},
pages = {D03202},
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websites = {http://doi.wiley.com/10.1029/2010JD014186},
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abstract = {Relative humidity (RH) has been observed to be anticorrelated with continental new particle formation. Several reasons have been proposed for this rather surprising finding, but no firm conclusions have been drawn so far. Here we study several of the proposed reasons: Enhanced coagulational scavenging of sub-3 nm clusters at high RH, diminished solar radiation at high RH leading to diminished gas phase oxidation chemistry, and increased condensation sink (CS) of condensable gases due to hygroscopic growth of the preexisting particles. Our theoretical calculations indicate that the increase of coagulational scavenging plays a relatively small role in the inhibition of nucleation at high RH. On the other hand, field data show that the maximum observed gas phase sulphuric acid concentrations are limited to RHs below 60%. The field data also indicate that this is likely due to low OH concentrations at high RH. This finding is also supported by aerosol dynamics model simulations. The model was used to find out whether this is mainly due to decreased source (solar radiation) or increased sink (CS) terms at the elevated RH. The simulation results show that the decreased source term at high RH limits H<inf>2</inf>SO<inf>4</inf> levels in the air, and therefore high new particle formation rates (above ∼1 cm<sup>-3</sup> s<sup>-1</sup>) rarely occur above 80% RH. Copyright 2011 by the American Geophysical Union.},
bibtype = {article},
author = {Hamed, Amar and Korhonen, Hannele and Sihto, Sanna Liisa and Joutsensaari, Jorma and Jrvinen, Heikki and Petäjä, Tuukka and Arnold, Frank and Nieminen, Tuomo and Kulmala, Markku and Smith, James N. and Lehtinen, Kari E.J. and Laaksonen, Ari},
doi = {10.1029/2010JD014186},
journal = {Journal of Geophysical Research Atmospheres},
number = {3}
}
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