View source for EUCAARI model intercomparison of BL nucleation parameterizations

As part of the EU FP6 EUCAARI European Aerosol Integrated Project,
UKCA simulations were carried out to investigate the role
these nucleation processes play in determining the properties
of European aerosol.

The EUCAARI project revolved around a major field campaign
in May 2008 together with a new network of
aerosol supersites (the EUSAAR network) were employed to
make detailed measurements of aerosol size distribution 
and composition.

As part of a joint EUCAARI-AEROCOM model intercomparison
around nucleation processes, UKCA-UM simulations were 
carried out with GLOMAP-mode 
coupled to the UKCA StdTrop-Aerchem chemistry and the UM
winds and temperatures nudged towards ECMWF operational
re-analysis fields for the year 2008.

The model was set to output the model tracers at the surface
interpolated to each of the EUSAAR sites at each model 
timestep thus enabling high temporal resolution evaluation 
of the size-resolved aerosol and composition from UKCA 
against the detailed observations from EUCAARI.

Equivalent runs were also carried out with the GLOMAP-mode
scheme driven by offline-oxidants in the TOMCAT chemistry
transport model -- and by parallel runs with the more
sophisticated GLOMAP-bin scheme.  A regional aerosol model
PMCAMx-UF (Spyros Pandis) was also run in a similar fashion.

Here we show this EUCAARI-AEROCOM model intercomparison of 
the high temporal resolution data for the concentration of
all-particles [[File:UKCA_EUCAARI_N3Hyytiala.pdf]]) and 
particles larger than 100nm [[File:UKCA_EUCAARI_N100Hyytiala.pdf]] 
from these four size-resolved aerosol models against
observations at the Hyytiala sites in Finland.