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哈尔滨工程大学学报（英文版） 2023年第2期22卷 284-295页

作者：杨一刘金贵李谊纯张春华 Haikou Marine Environment Monitoring Station State Oceanic AdministrationHaikou 570000China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Harbour Coastal and Offshore EngineeringBeibu Gulf UniversityQinzhou 535011China

In this study,we conducted numerical experiments to examine the effects of turbulence parameterization on temporal and spatial variations of suspended sediment ***,we applied the numerical model to the Yamen Channel,one of the main eight outfalls in the Pearl River *** the field application,we implemented the k−εscheme with a reasonable stability function using the continuous deposition formula during the erosion process near the water-sediment *** further validated and analyzed the temporal-spatial suspended sediment concentrations(SSCs).The experimental results show that under specified initial and boundary conditions,turbulence parameterization with stability functions can lead to different vertical profiles of the velocity and *** k−εpredicts stronger mixing with a maximum value of approximately twice the k−*** k−kl results in smaller SSCs near the surface layer and a larger vertical gradient than the k−ε.In the Yamen Channel,though the turbulent dissipation,turbulent viscosity and turbulence kinetic energy exhibit similar trends,SSCs differ significantly between those at low water and high water due to the tidal asymmetry and settling lag *** results can provide significant insights into environmental protection and estuarine management in the Pearl River Delta.

关键词： Suspended sediment General ocean turbulence model(GOTM) turbulence parameterization Yamen Channel Finite volume community ocean model(FVCOM)

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Evaluation of NASA GISS Post-CMIP5 Single Column Model Simulated Clouds and Precipitation Using ARM Southern Great Plains Observations

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Advances in Atmospheric Sciences 2017年第3期34卷 306-320页

作者： Lei ZHANG Xiquan DONG Aaron KENNEDY Baike XI Zhanqing LI College of Global Change and Earth System Science Beijing Normal University Department of Atmospheric and Oceanic Sciences University of MarylandCollege Park Department of Atmospheric Sciences University of North Dakota

The planetary boundary layer turbulence and moist convection parameterizations have been modified recently in the NASA Goddard Institute for Space Studies （GISS） Model E2 atmospheric general circulation model （GCM; post-CMIP5, hereafter P5）. In this study, single column model （SCM_P5） simulated cloud fractions （CFs）, cloud liquid water paths （LWPs） and precipitation were compared with Atmospheric Radiation Measurement （ARM） Southern Great Plains （SGP） groundbased observations made during the period 2002-08. CMIP5 SCM simulations and GCM outputs over the ARM SGP region were also used in the comparison to identify whether the causes of cloud and precipitation biases resulted from either the physical parameterization or the dynamic scheme. The comparison showed that the CMIP5 SCM has difficulties in simulating the vertical structure and seasonal variation of low-level clouds. The new scheme implemented in the turbulence parameterization led to significantly improved cloud simulations in P5. It was found that the SCM is sensitive to the relaxation time scale. When the relaxation time increased from 3 to 24 h, SCM_P5-simulated CFs and LWPs showed a moderate increase （10%-20%） but precipitation increased significantly （56%）, which agreed better with observations despite the less accurate atmospheric state. Annual averages among the GCM and SCM simulations were almost the same, but their respective seasonal variations were out of phase. This suggests that the same physical cloud parameterization can generate similar statistical results over a long time period, but different dynamics drive the differences in seasonal variations. This study can potentially provide guidance for the further development of the GISS model.

关键词： single column model model evaluation cloud fraction turbulence parameterization

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Analysis of Pressure Forcings for the Vertical Turbulent Fluxes in the Convective Boundary Layer at Gray Zone Resolutions

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Journal of Meteorological Research 2023年第6期37卷 841-854页

作者： Yahua WANG Xiaoping CHENG Jianfang FEI Bowen ZHOU College of Meteorology and Oceanography National University of Defense TechnologyChangsha410005China Key Laboratory of Electro-Optical Countermeasures Test and Evaluation Technology Luoyang471000China Key Laboratory for Mesoscale Severe Weather Ministry of EducationSchool of Atmospheric SciencesNanjing UniversityNanjing210000China

At kilometer and sub-kilometer resolutions,known as the numerical gray zone for boundary layer turbulence,the atmospheric boundary layer turbulence becomes partially resolved and partially subgrid-scale(SGS) in a numerical model,thus requiring scale-adaptive turbulence *** schemes are often built by modifying the existing parameterizations,either the planetary boundary layer(PBL) schemes or the large-eddy simulation(LES) closures,to produce the right SGS turbulent fluxes at gray zone ***,the underlying forcings responsible for the changes in the vertical turbulent fluxes are largely ignored in these *** study follows the original approach of Wyngaard(2004) and analyzes the turbulent buoyancy and momentum flux budgets,to gain a better understanding of the variations of flux forcings at gray zone *** investigation focuses on the pressure covariance term,which is one of the most dominant terms in the budget *** using the coarse-grained LES of a dry convective boundary layer(CBL) case as reference,two widely-used pressure covariance models are evaluated and optimized across the gray zone resolution *** optimized linear model is further evaluated a priori against another dry CBL case with a different bulk stability,and a shallow-cumulus-topped boundary layer *** model applies well to both cases,and notably shows good performance for the cloud *** on the analysis of the flux forcings and the optimized pressure model,a scale-adaptive turbulence model for the gray zone is derived from the steady-state flux budgets.

关键词： convective boundary layer gray zone flux budget pressure covariance turbulence parameterization

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