期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
Fog simulation using a mesoscale model in and around the Yodo River Basin,Japan 被引量:4
1
作者 HIKARI Shimadera KUNDAN Lal Shrestha +2 位作者 AKIRA Kondo AKIKAZU Kaga YOSHIO Inoue 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第7期838-845,共8页
In this study,fog simulations were conducted using the Fifth-Generation NCAR/Penn State Mesoscale Model (MM5) in and around the Yodo River Basin,Japan.The purpose is to investigate the MM5 performance of fog simulatio... In this study,fog simulations were conducted using the Fifth-Generation NCAR/Penn State Mesoscale Model (MM5) in and around the Yodo River Basin,Japan.The purpose is to investigate the MM5 performance of fog simulation for long-term periods.The simulations were performed for January,February,March,and July,2005 with a coarse 3-kin and a nested fine 1-km grid domains. Results of the simulations were compared with data from ten meteorological observatories,fog sampling site in Mt.Rokko,and visibility measurem... 展开更多
关键词 fog simulation the fifth-generation NCAR/Penn State mesoscale model (mm5) model evaluation occurrence of fog liquid water content
下载PDF
An evaporation duct prediction model coupled with the MM5 被引量:2
2
作者 JIAO Lin ZHANG Yonggang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2015年第5期46-50,共5页
Evaporation duct is an abnormal refractive phenomenon in the marine atmosphere boundary layer. It has been generally accepted that the evaporation duct prominently affects the performance of the electronic equipment o... Evaporation duct is an abnormal refractive phenomenon in the marine atmosphere boundary layer. It has been generally accepted that the evaporation duct prominently affects the performance of the electronic equipment over the sea because of its wide distribution and frequent occurrence. It has become a research focus of the navies all over the world. At present, the diagnostic models of the evaporation duct are all based on the Monin-Obukhov similarity theory, with only differences in the flux and character scale calculations in the surface layer. These models are applicable to the stationary and uniform open sea areas without considering the alongshore effect. This paper introduces the nonlinear factor a and the gust wind item wg into the Babin model, and thus extends the evaporation duct diagnostic model to the offshore area under extremely low wind speed. In addition, an evaporation duct prediction model is designed and coupled with the fifth generation mesoscale model (MMS). The tower observational data and radar data at the Pingtan island of Fujian Province on May 25-26, 2002 were used to validate the forecast results. The outputs of the prediction model agree with the observations from 0 to 48 h. The relative error of the predicted evaporation duct height is 19.3% and the prediction results are consistent with the radar detection. 展开更多
关键词 evaporation duct diagnosis mesoscale model (mm5) evaporation duct prediction model numerical simulation
下载PDF
吉林省MM5(MRF)中期模式分季节分系统24-48小时降水能力检验 被引量:2
3
作者 李楠 孙鸿雁 +1 位作者 李阳 刘姝妹 《吉林气象》 2010年第4期19-22,26,共5页
本文通过2006年1月1日到2008年12月31日共3年1095天0-48小时全省50站的降水预报性能进行检验,找出省内MM5(MRF)模式对吉林省24、48小时一般性降水、灾害性天气(暴雨、暴雪)和晴雨(雪)预报能力,以及MM5(MRF)模式对吉林省范围内的降水落... 本文通过2006年1月1日到2008年12月31日共3年1095天0-48小时全省50站的降水预报性能进行检验,找出省内MM5(MRF)模式对吉林省24、48小时一般性降水、灾害性天气(暴雨、暴雪)和晴雨(雪)预报能力,以及MM5(MRF)模式对吉林省范围内的降水落区预报、降水量级预报等几个方面预报的效果,希望可以在今后的工作中给业务人员以参考应用。 展开更多
关键词 mm5(mesoscale model5) 非静力动力模式 强对流天气 中尺度数值预报模式
下载PDF
EXPERIMENT ON THE FORECAST OF CHARACTERISTIC QUANTITIES OF ATMOSPHERIC TURBULENCE BY MESOSCALE MODEL MM5 被引量:2
4
作者 赵鸣 许丽人 汤剑平 《Acta meteorologica Sinica》 SCIE 2002年第1期94-106,共13页
In nested nonhydrostatic mesoscale model MM5,the characteristic quantities of atmospheric turbulence,i.e.,the standard deviations of the turbulent fluctuated speeds for three directions in PBL are computed by Mellor-Y... In nested nonhydrostatic mesoscale model MM5,the characteristic quantities of atmospheric turbulence,i.e.,the standard deviations of the turbulent fluctuated speeds for three directions in PBL are computed by Mellor-Yamada's level 2.5 closure scheme.The magnitudes and the vertical profiles of these quantities computed from the model are closely connected with temperature and wind speed profiles as well as the type of the ground with a significant diurnal variation,and are in agreement with known magnitudes and regularities in different stratification conditions.Hence the method in this paper is reasonable and convincible.Their horizontal distribution depends on the horizontal distribution of the stratification.The method of predicted characteristic quantities of turbulence from mesoscale model in this paper can be used in the problem of atmospheric diffusion and atmospheric environment. 展开更多
关键词 atmospheric turbulence standard deviation of turbulent speed mesoscale model mm5 level 2.5 closure scheme
原文传递
NUMERICAL SIMULATION OF MESOSCALE STRUCTURES OF TYPHOON AND OROGRAPHIC EFFECTS USING MM5
5
作者 王鹏云 《Acta meteorologica Sinica》 SCIE 1999年第4期474-493,共20页
The track, landfall, dynamic and thermodynamic and cloud-rain physical mesoscale structures and their evolution of typhoon HERB 1996 in 36 h from 0000 UTC 31 July to 1200 UTC 1 August 1996 were simulated by using the ... The track, landfall, dynamic and thermodynamic and cloud-rain physical mesoscale structures and their evolution of typhoon HERB 1996 in 36 h from 0000 UTC 31 July to 1200 UTC 1 August 1996 were simulated by using the non-hydrostatic mesoscale model MM5. This period covered the process of typhoon HERB landfall at Taiwan and Fujian Provinces. Results show that the model successfully simulated the landfall process of typhoon HERB, revealed the most important characteristics of the mesoscale dynamic and thermodynamic and cloud-rain physical structure during its landfall. The simulated typhoon track was close to the observation. The center of cyclonic circulation simulated at 0000 UTC on 1 August 1996 (24 h integration) was located in shore near Fuqing, Fujian Province at which the typhoon was reported to landfall two hours later. It shows that strong upward motion formed by low level convergence existed in the eye-wall and subsidence at the eye. The wind field shows clear asymmetrical structure near the typhoon center. The cloud and rainband was screw-typed distributed around typhoon center, and consisted of meso-β scale rain cores. During the period of typhoon HERB staying near and passing over Taiwan, the lower cloud was developed in the eye region so that the previous clear typhoon eye on the satellite pictures became fuzzy. Observation shows that the typhoon center was 'warm', but the model simulations with higher space resolution show that in the mid-troposphere the region of eye-wall with stronger upward motion and more cloud-and rain- water was warmer than the eye. During the period of typhoon passing over Taiwan and its following landfall at Fujian, the track of model typhoon deviated about 30 km northward (i. e., rightward) because of the orographic effects of Taiwan Island, but the strength of the typhoon was not affected remarkably. The amount of rainfall on Taiwan in the 36 h simulations was enhanced more than six times by the orographic lifting of Taiwan Mountain. 展开更多
关键词 TYPHOON mesoscale cloud physical structure orographic effects mm5 (mesoscale model version 5)
原文传递
Numerical Simulation of Wind and Temperature Fields over Beijing Area in Summer 被引量:5
6
作者 胡小明 刘树华 +1 位作者 王迎春 李矩 《Acta meteorologica Sinica》 SCIE 2005年第1期120-127,共8页
The non-hydrostatic mesoscale model MM5V3 is used to simulate the wind andtemperature fields of the atmospheric boundary layer over Beijing area in summer with the meshresolution of 1 km. The simulation results show t... The non-hydrostatic mesoscale model MM5V3 is used to simulate the wind andtemperature fields of the atmospheric boundary layer over Beijing area in summer with the meshresolution of 1 km. The simulation results show that the numerical model can successfully simulatethe urban heat island effect and the wind and temperature fields which are affected by thecomplicated topography and urban heat island. The results show that: (1) the west area (from Haidianto Fengtai Districts) is always the high temperature center of Beijing, where the surfacetemperature is about 6 K higher than the other suburbs; and (2) due to the unique topography thewind of Beijing area during the daytime is southern anabatic wind and at the night is northernkatabatic wind. The results comparing well with the data from surface observation stations validatethe accuracy of the simulation. 展开更多
关键词 mesoscale model mm5 numerical simulation urban heat island wind field temperature field climatic effect over Beijing area
原文传递
TYPHOON PROCESS AND ITS IMPACT ON THE SURFACE CIRCULATION IN THE NORTHERN SOUTH CHINA SEA 被引量:3
7
作者 TANG Ling ZHAN Jie-min +2 位作者 CHEN Yi-zhan LI Yok-sheung NIE Yu-hua 《Journal of Hydrodynamics》 SCIE EI CSCD 2011年第1期95-104,共10页
A severe typhoon Utor,occurring between July 3 and 8,2001,brought heavy rainfall,strong wind and storm surge.Utor was responsible for tremendous destruction and economic losses in Philippines,Taiwan and Guangdong.An a... A severe typhoon Utor,occurring between July 3 and 8,2001,brought heavy rainfall,strong wind and storm surge.Utor was responsible for tremendous destruction and economic losses in Philippines,Taiwan and Guangdong.An air-sea model system (MM5 and Princeton Ocean Model(POM))was built to simulate meteorological dynamics and ocean circulation in the South China Sea(SCS).In the POM the output of MM5 was used as the input data.With an increased number of vertical levels,a high-resolution planetary boundary layer scheme and updated landuse/vegetation data,the accuracy of computing wind,temperature and other meteorological fields are improved in near surface and upper levels in MM5 simulations.The simulated trajectory and wind speed of Utor are close to the observed results.The simulated distribution of rainfall is accorded well with measured data in the Pearl River Delta(PRD)area.At different meteorological stations in Hong Kong,the wind,temperature and sea surface pressure are well simulated.The simulated ocean surface current and surface temperature fields have an obvious rightward-biased response to the typhoon Utor,and the maximum velocity and the lowest temperature region appear in the 30 km of the right side of the typhoon track.The typhoon Utor could make the water 50m under the surface ocean unwell to surface and the ocean surface temperature decrease by about 2°C. 展开更多
关键词 mesoscale model mm5 Princeton Ocean model(POM) air-sea coupling ocean surface circulation
原文传递
Numerical Study on Microphysical Processes of Two Different Snowfall Cases in Northern China
8
作者 孙晶 王鹏云 +1 位作者 李想 逯莹 《Acta meteorologica Sinica》 SCIE 2007年第4期420-437,共18页
In this paper, two snowfall cases under different weather conditions in northern China are simulated by using the meso scale model MM5. Two-way nesting structure of domains is designed for each case. Among the explici... In this paper, two snowfall cases under different weather conditions in northern China are simulated by using the meso scale model MM5. Two-way nesting structure of domains is designed for each case. Among the explicit schemes of MM5, the Reisner graupel scheme is selected to describe the microphysical process. The simulated snow-bands of two cases are basically consistent with observations. The simulated results of microphysical processes are mainly discussed. The hydrometeors and their sources and sinks under different weather backgrounds are described. The feedback effects of microphysical processes on the thermal and dynamic processes are also discussed. Method that outputs the accumulative sources and sinks per hour is used to analyze the distribution characteristics of hydrometeors during the strongest snowfall period. Two sensitivity tests (called heat test and drag test) are conducted to examine the effects of microphysical processes on cloud produced by the latent heat and drag force. Results have shown that the distribution of particles has a close relation with temperature. The temperature of Beijing snowfall is under 0℃ and there exist vapor and solid phase particles, while Liaoning snowfall has vapor, liquid, and solid phase particles due to the warm temperature. The distribution of these particles is not the same at different development stages. From the analyses of the characteristics of sources and sinks, it is found that snow is mainly produced by the deposition and accretion with ice. Cloud water is crucial to graupel. The melting of ice-phase particles enhances the rain production. The results of heat tests and drag tests reveal that the microphysical processes have interacted with the dynamic and thermal processes. Latent heat release of hydrometeors feeds back positively on snowfall while the drag force not. At last, comparisons of simulated results have been done between the two different kinds of snowfall cases. The microphysical processes of Liaoning snowfall case is more complicated than those of Beijing snowfall case. The values of the cloud variables are larger and the interactions between the microphysical processes and the thermal and dynamic processes of Liaoning snowfall case are stronger than those of Beijing snowfall case. 展开更多
关键词 SNOWFALL mesoscale model mm5 microphysical process sources and sinks
原文传递
Responses of thermal structure and vertical dynamic structure of South China Sea to Typhoon Chanchu
9
作者 陈宜展 詹杰民 +2 位作者 罗莹莹 韦永康 唐灵 《Journal of Hydrodynamics》 SCIE EI CSCD 2014年第3期458-466,共9页
The response of the South China Sea(SCS) to Typhoon Chanchu(2006) was examined using the MM5 and POM model. In the POM model, sea surface boundary conditions were forced by the simulation wind field from MM5, the ... The response of the South China Sea(SCS) to Typhoon Chanchu(2006) was examined using the MM5 and POM model. In the POM model, sea surface boundary conditions were forced by the simulation wind field from MM5, the velocity forcing was introduced in the eastern boundary and the computational schemes of heat fluxes at the surface were introduced. Comparison with the observation data shows that the simulated results are reliable. In the response process of the SCS to Typhoon Chanchu, the influence of the heat fluxes on thermal structure of the SCS was regionally different. Strong wind forcing would lead to upwelling phenomenon in the lateral boundary of deep water basin. Furthermore, the Ekman pumping theory was used to discuss subsurface upwelling and downwelling phenomenon in typhoon forced stage. 展开更多
关键词 South China Sea(SCS) TYPHOON thermal structure vertical dynamic structure mesoscale model 5(mm5) princeton ocean model(POM)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部