Abstract
Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation (NAN) submodel includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The ion pair production rate, needed to calculate the ion-induced or ion-mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground-based observations.
Highlights
The influence of aerosol particles on various aspects of climate and human health (Knibbs et al, 2011; Lelieveld et al, 2015) is well established
Two new submodels were introduced to Modular Earth Submodel System (MESSy) and tested with ECHAM/MESSy Atmospheric Chemistry (EMAC)
The submodel IONS provides ion pair production rates that can be used in other submodels such as global electric circuit (GEC) (Baumgaertner et al, 2013) or the here-presented NAN submodel
Summary
The influence of aerosol particles on various aspects of climate and human health (Knibbs et al, 2011; Lelieveld et al, 2015) is well established. A detailed understanding of the sources of aerosol particles is necessary to study their climate and health effects. New particle formation (NPF), i.e. nucleation and growth of new aerosol particles from vapours, is an important source of secondary aerosol particles in the troposphere and planetary boundary layer, and observed events of NPF are well documented (Weber et al, 1999; Kulmala et al, 2004). Manninen et al (2010) give examples of NPF at various European measurement sites, Pierce et al (2014) in Canada, Bae et al (2010) in the USA and Suni et al (2008) in Australia, and Sipilä et al (2016) observed NPF in a coastal region of Ireland. According to Merikanto et al (2009) and Yu and Luo (2009), a significant proportion, about 50 % globally, of cloud condensation nuclei (CCN) originate from NPF
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