@Article{MachadoChab:2015:EfTuPa,
author = "Machado, Luiz Augusto Toledo and Chaboureau, Jean-Pierre",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University
of Toulouse}",
title = "Effect of turbulence parameterization on assessment of cloud
organization",
journal = "Monthly Weather Review",
year = "2015",
volume = "143",
number = "8",
pages = "3246--3263",
keywords = "Convection, Turbulence, Cloud resolving models.",
abstract = "This study evaluates the cloud and rain cell organization in space
and time as forecasted by a cloud-resolving model. The forecast
fields, mainly describing mesoscale convective complexes and cold
fronts, were utilized to generate synthetic satellite and radar
images for comparison with Meteosat Second Generation and S-band
radar observations. The comparison was made using a tracking
technique that computed the size and lifetime of cloud and rain
distributions and provided histograms of radiative quantities and
cloud-top height. The tracking technique was innovatively applied
to test the sensitivity of forecasts to the turbulence
parameterization. The simulations with 1D turbulence produced too
many small cloud systems and rain cells with a shorter lifetime
than observed. The 3D turbulence simulations yielded size and
lifetime distributions more consistent with the observations. As
shown for a case study, 3D turbulence yielded longer mixing
length, larger entrainment, and stronger turbulence kinetic energy
inside clouds than 1D turbulence. The simulation with 3D
turbulence had the best scores in high clouds. These features
suggest that 1D turbulence did not produce enough entrainment,
allowing the formation of more small cloud and rain cells than
observed. Further tests were performed on the sensitivity to the
mixing length with 3D turbulence. Cloud organization was very
sensitive to in-cloud mixing length and the use of a very small
value increased the number of small cells, much more than the
simulations with 1D turbulence. With a larger in-cloud mixing
length, the total number of cells, mainly the small ones, was
strongly reduced.",
doi = "10.1175/MWR-D-14-00393.1",
url = "http://dx.doi.org/10.1175/MWR-D-14-00393.1",
issn = "0027-0644",
language = "en",
urlaccessdate = "27 abr. 2024"
}