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动量通量     
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  momentum flux
     In the context of field observations at Shentou (112°17′ E, 39°18′ S) in September~October 1988, calculation is carried out of frictional velocity, characteristic temperature and turbulent momentum flux, with turbulent heat flux dealt with by two methods.
     利用山西省神头(112°17′E,39°18′N)1988年9~10月间采集的大气野外测试资料,计算了摩擦速度、特征温度、湍流动量通量
短句来源
     There are strong correlation between CO 2 flux and the net radiation(Rn),available energy(H+LE),photosynthetically active radiation and momentum flux.
     CO2通量与净辐射(Rn)、可利用能(H+LE)、光合有效辐射和动量通量之间有较好的相关关系
短句来源
     The comparisons and analysis of turbulent flux between NCEP reanalysis data and buoy data show that NCEP momentum flux and recalculated NCEP heat flux can represent the effect of numerical simulation of NCEP reanalysis database better.
     通过与浮标观测资料的对比分析,指出NCEP动量通量、再计算NCEP热通量更能够代表NCEP再分析数据库的数值模拟效果。
短句来源
     the relative error of recalculated momentum flux is smaller in the middle-high wind speed range,but the largest relative error of recalculated momentum,sensible and latent heat fluxes are about 50% in the other conditions.
     在中高风速下,再计算动量通量的相对误差较小,其他情况下再计算动量、感热和潜热通量的相对误差最高能达到50%左右;
短句来源
     Based on the velocity remapping strategy of the SALE algorithm,three methods are proposed to improve the accuracy and monotonicity of momentum flux calculation on a 1D staggered grid: the SUR method which employs the upwind-type slope and a repairing procedure;
     在一维交错网格上基于SALE算法的速度重映策略,提出了3种动量通量的改进算法:①采用迎风斜率加修补的SUR方法;
短句来源
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  flux of momentum
     This model solves the set of prognostic equations of horizontal components of the wind, the potential temperature, specific humidity, an energy balance equation, and a soil heat conduction equation, to obtain the ground surface temperature, the surface flux of momentum, sensible heat, and latent heat. These fluxes are then used to calculate refractive index structure parameter by empirical relationships of turbulence flux and temperature structure parameter according to MoninObukhov similarity theory. 
     通过解大气边界层风速、位温度、绝对湿度预报方程,表面热平衡方程和土壤热传导方程,得到地表温度、表面层的动量通量、显热通量和潜热通量。 再由Monin Obukhov相似理论,从湍流通量和温度结构常数的经验关系计算出折射率结构常数。
短句来源
  the momentum flux
     The PIV experimental study shows that for f=400 Hz,the momentum flux of the self-coupling jet achieves its maximum value,while the boundary of the primary jet reaches its maximum width due to the strongest suction ability to the environmental gas.
     PIV实验表明,当激励信号f=400 Hz时,自耦合射流的动量通量达到最大,主射流的对环境气体的卷吸能力最强,其边界也达到了最宽;
短句来源
     In generally,the momentum flux of Linze is larger than that of Beijing.
     得到1月至11月感热通量、潜热通量临泽均大于北京,而动量通量4月中旬后及11月上旬前临泽大于北京,而1月至4月中旬前,及11月上旬后北京大于临泽。
短句来源
     The momentum flux and friction velocity increase with speed.
     动量通量和摩擦速度随风速增加。
短句来源
     In a two-layer model with a lower unstable boundary layer and an upper stable layer, the waves in the upper layer induced by a two-dimensional terrain, as well as the momentum flux caused by the velocity disturbance in the lower layer are studied analytically It is shown that mountain waves still play significant role in the momentum budget in the atmosphere even though the lower layer is unstable
     讨论了在上部稳定层覆盖的不稳定大气边界层中,二维地形扰动所引起的上层波动以及扰动速度的动量通量输送,表明在大气低层层结不稳定时,波动仍可能在大气动量平衡中起明显作用。
短句来源
     Based on the Ocean-Atmosphere Heat,Momentum and fresh water Climatological Flux Atlas of Southampton Oceanography Center,the climatology and seasonal variation characters of the heat,fresh water flux and the wind stress curl in China adjacent seas,which is computed from the momentum flux data,are analyzed and studied by EOF method and statistical methods.
     本文依据英国南安普敦海洋中心气候学海面通量资料集,采用EOF及一般统计分析方法,分析和研究了中国近海热通量、淡水通量及由动量通量计算而得的风应力旋度场的气候平均和季节变化特征。
短句来源
更多       
  fluxes of momentum
     The turbulent fluxes of momentum and heat, and statistics and spectra of wind speed fluctuations were calculated from the digital data sampled at rate of both 1s~(-1) and 11s~(-1) , using eddy correlation and FFT method.
     采样速率为每秒1次和11次,数字量记录。 计算了湍流动量通量和热通量的日变化,以及湍流风速的统计量和功率谱。
短句来源
     The drag coefficient CD of momentum transfer is approximated by the expression 103 CD = 0.003U210+ 0.020U10 + 0.836. And vertical fluxes of momentum, latent and sensible heat obtained from the eddy correlation or profile method are shown with various statistical quantities of turbulence structure such as friction velocity u * and aerodynamic roughness height z0.
     观测期动量通量变化在0.05~0.30 N/m2之间,季风爆发期明显增大; 曳力系数CD平均为 1.12×10-3,它随平均风速变化可以表示为关系式103CD=0.003U210+0020U10+0.836或103CD= 0.056U10+0.732。
短句来源

 

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  momentum flux
The law of conservation of the angular momentum flux during disintegration of a rotating jet is mathematically formulated and studied.
      
A solution is obtained, within the framework of the boundary layer theory, to the problem of the unsteady flow created by a two-dimensional jet source for a given momentum flux variation with time.
      
A study is made of the laminar flow of a viscous incompressible fluid in a swirling jet that is produced by the action of a point source which transmits to the medium surrounding it a finite momentum flux.
      
Measuring the momentum flux of molecules reflected from a surface of given roughness in free molecule flow
      
The equation is complemented by conservation laws for the mass flux and the momentum flux through the deflagration front of finite thickness.
      
更多          
  flux of momentum
Numerical results show that mechanical forcing overwhelms thermal forcing in maintaining the mean flow in which the internal mechanical forcing associated with horizontal eddy flux of momentum plays the most important roles.
      
The flux of momentum also exhibits similar features.
      
In both seasons the greatest oceanic flux of momentum is found in the region to the south of Greenland and Iceland.
      
The annual average vertical flux of momentum at temperate and high latitudes is -0.25 dyn cm-2, while the average kinetic energy dissipation rate in a unit column of atmosphere is -5 × 103 erg cm-2 s-1.
      
Consequently, the most probable values of vertical flux of momentum and heat may be estimated to satisfy as much as possible observed data of both wind and temperature simultaneously.
      
更多          
  the momentum flux
Measuring the momentum flux of molecules reflected from a surface of given roughness in free molecule flow
      
The equation is complemented by conservation laws for the mass flux and the momentum flux through the deflagration front of finite thickness.
      
The dependence of the variation in the depth of the upper mixed layer (MLD) on the governing parameters (the momentum flux, the buoyancy fluxes at the ocean surface, and the density gradient in the pycnocline) is considered.
      
It has been found that the effects of waves on currents can be expressed in terms of the momentum flux by waves.
      
Parametric variations characterizing the mixing processes of the temperature and velocity fields were examined and correlated in terms of the momentum flux ratio and downstream distance.
      
更多          
  fluxes of momentum
The surface fluxes of momentum, sensible heat and latent heat each day are further estimated by the bulk formulas, annual mean of these fluxes is 3.4×10-2 and 1.8×102N/m2, 73.1 and 67.2 W/m2, 15.4 and 2.9 W/m2, respectively.
      
Observation research of the turbulent fluxes of momentum, sensible heat and latent heat over the West Pacific Tropical Ocean Are
      
This paper describes results of the fluxes of momentum , sensible heat and latent heat for the West Pacific Tropical Ocean Area (127°E-150°E, 5°N-3°S).
      
The resulting highly coupled PDE system has been solved using the control volume based numerical approach where the power-law scheme was used extensively to compute the diffusive and convective fluxes of momentum.
      
Study on fluxes of momentum and sensible heat, the drag coefficientCd and roughnessZ0*
      
更多          
  其他


In this paper, the structures of wind and temperature fields and characteristics of meteorological parameters in surface layer are analysed utilizing a 325 m meteorological tower in Beijing. The vertical shear of wind velocity, acceleration of horizontal wind velocity, vertical wind velocity, stream function, and fluxes of heat and momentum etc. are computed. The emphasis has been put on the study of the structure of wind field of thunderstorm density current. It is shown that the pressure, wind direction, wind...

In this paper, the structures of wind and temperature fields and characteristics of meteorological parameters in surface layer are analysed utilizing a 325 m meteorological tower in Beijing. The vertical shear of wind velocity, acceleration of horizontal wind velocity, vertical wind velocity, stream function, and fluxes of heat and momentum etc. are computed. The emphasis has been put on the study of the structure of wind field of thunderstorm density current. It is shown that the pressure, wind direction, wind velocity and temperature in surface layer show significant variation when the thunderstorm density current passing. In addition, it is confirmed that the severe gust surges and the strong vertical motions existed in the thunderstorm density current. Moreover, the region where meteorological parameters show greatest variation is at the head of the density current. The largest vertical shear of wind velocity and strongest downdraft are at the rear of the head and the largest horizontal wind velocity acceleration and strongest updraft are at the front of the head. All these are very detrimental for taking off and landing of aeroplane.

本文利用新建325米气象塔分析了北京地区一次雷暴密度流的风场、温度场和地面诸气象要素的特征,计算了320米以下风速垂直切变、水平风速加速度、垂直风速、流函数、热通量和动量通量等物理量,着重对雷暴密度流风场结构进行了研究。得到当雷暴密度流过境时地面气压、风向、风速和温度依次均发生剧烈变化的情况。同时还证实,在雷暴密度流中存在着强烈的阵风浪涌和垂直运动,而且密度流的头部是诸气象要素变化最剧烈的区域,尤其是头的后部存在着最大的风速垂直切变和最强的下沉气流;头的前部存在着最大的水平风速加速度和最强的上升气流。这些对于飞机起飞降落是十分危险的。

The stationary planetary waves responding to forcing by the northern hemispheric topography and stationary heat souces in winter are investigated by means of a quasi-geostrophic, steady state, 34-level model, with Rayleigh friction, the effect of Newtonian cooling and the horizontal kinematic thermal diffusivity included in a spherical coordinate system.The momentum and heat fluxes due to stationary planetary waves responding to forcing are computed, and are qualitatively in good agreement with the observed...

The stationary planetary waves responding to forcing by the northern hemispheric topography and stationary heat souces in winter are investigated by means of a quasi-geostrophic, steady state, 34-level model, with Rayleigh friction, the effect of Newtonian cooling and the horizontal kinematic thermal diffusivity included in a spherical coordinate system.The momentum and heat fluxes due to stationary planetary waves responding to forcing are computed, and are qualitatively in good agreement with the observed results.The computed results show that the poleward momentum and heat flux in the stratosphere has a maximum, respectively.

本文应用一个包括Rayleigh摩擦、牛顿冷却、水平涡旋热量扩散、定常、准地转、34层球坐标模式来研究冬季北半球地形与定常热源强迫所产生的定常行星波。 本文计算了强迫所产生的定常行星波引起的动量通量与热量通量。计算结果与观测结果比较一致。 计算结果表明:最大向北的动量通量与热量通量位于平流层。

The envelope orography scheme developed by Wallace et. al.has been shown to improve medium-range weather forecasts of ECMWF. Their numerical experiment data are used for this research. Verifications include zonal mean westerly wind, temperature and meridional circulation, mean meridional flux of angular momentum due to meridional circulations and planetary and synoptic scale eddies. Results show that the introduction of this scheme improves predictions of zonal temperature and wind fields in tropical troposphere,...

The envelope orography scheme developed by Wallace et. al.has been shown to improve medium-range weather forecasts of ECMWF. Their numerical experiment data are used for this research. Verifications include zonal mean westerly wind, temperature and meridional circulation, mean meridional flux of angular momentum due to meridional circulations and planetary and synoptic scale eddies. Results show that the introduction of this scheme improves predictions of zonal temperature and wind fields in tropical troposphere, and simulates better the total eddy angular momentum flux. However predictions of synoptic scale systems and parameterizations of tropical (Convection and culmulus friction have to be improved further.

Wallace等的研究表明,由于引进了包络地形方案,欧洲中期天气预报中心(ECMWF)的中期天气预报有所改善。本文是上述工作的继续。所用的资料为原作者的数值试验结果。检验的对象包括纬向平均风场、温度场和经圈环流,及不同波数域中的涡旋和经圈环流对角动量的平均经向输送。结果表明,在冬季,包络地形方案对低纬地区的温度场和风场的预报略有改进,对总涡旋动量通量的模拟也较好。然而对天气尺度系统的预报和对热带对流及积云摩擦的参数化却有待更进一步改善。

 
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