Shallow Cumulus Representation and Its Interaction with Radiation and Surface at the Convection Gray ZoneSource: Monthly Weather Review:;2019:;volume 147:;issue 007::page 2467Author:Pedruzo-Bagazgoitia, Xabier
,
Jiménez, Pedro A.
,
Dudhia, Jimy
,
Vilà-Guerau de Arellano, Jordi
DOI: 10.1175/MWR-D-19-0030.1Publisher: American Meteorological Society
Abstract: AbstractThis study presents a systematic analysis of convective parameterizations performance with interactive radiation, microphysics, and surface on an idealized day with shallow convection. To this end, we analyze a suite of mesoscale numerical experiments (i.e., with parameterized turbulence). In the first set, two different convection schemes represent shallow convection at a 9-km resolution. These experiments are then compared with model results omitting convective parameterizations at 9- and 3-km horizontal resolution (gray zone). Relevant in our approach is to compare the results against two simulations by different large-eddy simulation (LES) models. Results show that the mesoscale experiments, including the 3-km resolution, are unable to adequately represent the timing, intensity, height, and extension of the shallow cumulus field. The main differences with LES experiments are the following: a too late onset, too high cloud base, and a too early transport of moisture too high, overestimating the second cloud layer. Related to this, both convective parameterizations produce warm and dry biases of up to 2 K and 2 g kg?1, respectively, in the cloud layer. This misrepresentation of the cloud dynamics leads to overestimated shortwave radiation variability, both spacewise and timewise. Domain-averaged shortwave radiation at the surface, however, compares satisfactorily with LES. The shortwave direct and diffuse partition is misrepresented by the convective parameterizations with an underestimation (overestimation) of diffuse (direct) radiation both locally and, by a relative 40% (10%), of the domain average.
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contributor author | Pedruzo-Bagazgoitia, Xabier | |
contributor author | Jiménez, Pedro A. | |
contributor author | Dudhia, Jimy | |
contributor author | Vilà-Guerau de Arellano, Jordi | |
date accessioned | 2019-10-05T06:56:15Z | |
date available | 2019-10-05T06:56:15Z | |
date copyright | 5/8/2019 12:00:00 AM | |
date issued | 2019 | |
identifier other | MWR-D-19-0030.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4263887 | |
description abstract | AbstractThis study presents a systematic analysis of convective parameterizations performance with interactive radiation, microphysics, and surface on an idealized day with shallow convection. To this end, we analyze a suite of mesoscale numerical experiments (i.e., with parameterized turbulence). In the first set, two different convection schemes represent shallow convection at a 9-km resolution. These experiments are then compared with model results omitting convective parameterizations at 9- and 3-km horizontal resolution (gray zone). Relevant in our approach is to compare the results against two simulations by different large-eddy simulation (LES) models. Results show that the mesoscale experiments, including the 3-km resolution, are unable to adequately represent the timing, intensity, height, and extension of the shallow cumulus field. The main differences with LES experiments are the following: a too late onset, too high cloud base, and a too early transport of moisture too high, overestimating the second cloud layer. Related to this, both convective parameterizations produce warm and dry biases of up to 2 K and 2 g kg?1, respectively, in the cloud layer. This misrepresentation of the cloud dynamics leads to overestimated shortwave radiation variability, both spacewise and timewise. Domain-averaged shortwave radiation at the surface, however, compares satisfactorily with LES. The shortwave direct and diffuse partition is misrepresented by the convective parameterizations with an underestimation (overestimation) of diffuse (direct) radiation both locally and, by a relative 40% (10%), of the domain average. | |
publisher | American Meteorological Society | |
title | Shallow Cumulus Representation and Its Interaction with Radiation and Surface at the Convection Gray Zone | |
type | Journal Paper | |
journal volume | 147 | |
journal issue | 7 | |
journal title | Monthly Weather Review | |
identifier doi | 10.1175/MWR-D-19-0030.1 | |
journal fristpage | 2467 | |
journal lastpage | 2483 | |
tree | Monthly Weather Review:;2019:;volume 147:;issue 007 | |
contenttype | Fulltext |