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@ARTICLE{Salzmann:12590,
author = {Salzmann, M. and Ming, Y. and Golaz, J.-C. and Ginoux, P.A.
and Morrison, H. and Gettelman, A. and Krämer, M. and
Donner, L.J.},
title = {{T}wo-moment bulk stratiform cloud microphysics in the
{GFDL} {AM}3 {GCM}: {D}escription, evaluation, and
sensitivity tests},
journal = {Atmospheric chemistry and physics},
volume = {10},
number = {16},
issn = {1680-7316},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {PreJuSER-12590},
pages = {8037 - 8064},
year = {2010},
note = {Record converted from VDB: 12.11.2012},
abstract = {A new stratiform cloud scheme including a two-moment bulk
microphysics module, a cloud cover parameterization allowing
ice supersaturation, and an ice nucleation parameterization
has been implemented into the recently developed GFDL AM3
general circulation model (GCM) as part of an effort to
treat aerosol-cloud-radiation interactions more
realistically. Unlike the original scheme, the new scheme
facilitates the study of cloud-ice-aerosol interactions via
influences of dust and sulfate on ice nucleation. While
liquid and cloud ice water path associated with stratiform
clouds are similar for the new and the original scheme,
column integrated droplet numbers and global frequency
distributions (PDFs) of droplet effective radii differ
significantly. This difference is in part due to a
difference in the implementation of the
Wegener-Bergeron-Findeisen (WBF) mechanism, which leads to a
larger contribution from super-cooled droplets in the
original scheme. Clouds are more likely to be either
completely glaciated or liquid due to the WBF mechanism in
the new scheme. Super-saturations over ice simulated with
the new scheme are in qualitative agreement with
observations, and PDFs of ice numbers and effective radii
appear reasonable in the light of observations. Especially,
the temperature dependence of ice numbers qualitatively
agrees with in-situ observations. The global average
long-wave cloud forcing decreases in comparison to the
original scheme as expected when super-saturation over ice
is allowed. Anthropogenic aerosols lead to a larger decrease
in short-wave absorption (SWABS) in the new model setup, but
outgoing long-wave radiation (OLR) decreases as well, so
that the net effect of including anthropogenic aerosols on
the net radiation at the top of the atmosphere (netradTOA =
SWABS-OLR) is of similar magnitude for the new and the
original scheme.},
keywords = {J (WoSType)},
cin = {IEK-7},
ddc = {550},
cid = {I:(DE-Juel1)IEK-7-20101013},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK491},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
url = {https://juser.fz-juelich.de/record/12590},
}