Next generation aerosol-cloud microphysics for advanced high-resolution climate predictions Page: 3 of 22
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3) Peer-reviewed published papers from this project:
Four peer-reviewed papers have come out of this project. We list these
publications here together with highlighted results. The full PDFs are attached to
this report.
a) Bennartz, R., A. Lauer, and J. L. Brenguier, 2011a: Scale-aware integral
constraints on autoconversion and accretion in regional and global climate
models. Geophys. Res. Lett., doi:10.1029/2011GL047618,accepted 25 April 2011.
" We describe a novel method to constrain autoconversion and accretion rates
in climate models.
" The method offers two desirable features that might ultimately help to
effectively eliminate autoconversion efficiency as a free tuning parameter in
climate models.
" The new method was implemented into the University of Hawaii's regional
climate model iRAM.
" A series of test integrations were performed at horizontal resolutions
ranging from 0.25 x0.25 to 2 x2 .
" The constrained approach was compared with a conventional approach
commonly found in current climate models. Comparisons with an
observational climatology of cloud liquid water path reveal significant
improvements, in particular a better consistency between different model
resolutions.
b) Lauer, A., K. Hamilton, Y. Wang, V. Phillips, R. Bennartz, 2010: The impact of
global warming on marine boundary layer clouds over the eastern Pacific - A
regional model study, Journal of Climate, 23, 5844-5863
" Cloud simulations and cloud-climate feedbacks in the tropical and
subtropical eastern Pacific region in 16 state-of-the-art coupled global
climate models and in the International Pacific Research Center Regional
Atmospheric Model (iRAM) are examined.
" In contrast to the coupled global models, iRAM simulates mean clouds and
interannual cloud variations that are quite similar to those observed in this
region.
" Cloud-climate feedbacks in iRAM are investigated running several global
warming scenarios. All of these simulations show a distinct reduction in low-
level cloud amount, particularly in the stratocumulus regime, resulting in
positive local feedback parameters in these regions.
" The cloud-climate feedback averaged over the same east Pacific region was
also calculated from the simulations for each of the 16 global models with all
results less than the values obtained in the comparable iRAM simulations.
" In the global models, the cloud feedback in the full tropical-subtropical zone,
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Bennartz, Ralf; Hamilton, Kevin P; Phillips, Vaughan T.J.; Wang, Yuqing & Brenguier, Jean-Louis. Next generation aerosol-cloud microphysics for advanced high-resolution climate predictions, report, January 14, 2013; United States. (https://digital.library.unt.edu/ark:/67531/metadc843461/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.