The circulation of the free atmosphere is predominantly zonal and only to a slight extent meridional.
自由大气中环流主要是纬向的，经向性很弱。
As an example, the budget of the meridional component of the trend equation is selected and diagnosed by using the above mentioned mesoscale simulation data of the torrential rain in the JiangHuai valley, and the diagnostic results show that the temporal variation of the averaged specific humidity gradient over the duration of the simulation is mainlyrelated with convergence/divergence effect, secondary circulation effect associated with horizontal vortex tube, and water vapor source/sink effect.
进而从理论上推导了大气湿度梯度倾向方程，指出大气湿度梯度的变化与平流效应、散度效应、水平或垂直涡管效应以及水汽源汇的梯度有关；利用中尺度模拟资料对湿度梯度倾向方程的经向分量进行了简单的方程诊断，模拟时段平均的诊断分析表明，大气经向湿度梯度绝对值的变化主要同散度效应、与水平涡管相关的次级环流效应以及水汽源汇效应相关。
The Simulation Study of the Formation of the Atmospheric Mean Meridional Circulation Under the ideal condition in which the orography is removed and only the sea-land distribution is kept, the SAMIL is used to study how the mean meridional circulation is formed from a static atmosphere.
2大气中平均经圈环流形成的模拟研究在取消地形高度，保存海陆分布的外部理想条件下，利用大气环流模式模拟静止大气在南北加热差异的驱动下利用大气环流模式模拟静止大气如何通过角动量的制造和消耗，使大气由静止达到一个稳定的状态。
Using the monthly dataset of NCEP/NCAR reanalysis, the zonal structure of the Arctic Oscillation and its correlation with the zonal-mean zonal wind and the meridional circulation are studied.
运用NCEP/NCAR再分析月资料，分季节研究了北极涛动的纬向结构，以及与之相对应的纬向平均纬向风和经圈环流异常的空问结构特徵，并初步探讨了北极涛动的维持机制。
Anomalous anticyclone at the upper level is form in response to the enhanced convective heating off the equator, resulting in increased geopotential height and temperature over the Tibetan Plateau and in favor of the early BOB seasonal transition. Another effect of Positive SST anomalies over the Warm Pool is to induce anomalously strong zonal monsoon circulation. The anomalous zonal monsoon circulation strengths the southerlies in upper levels due to Coriolis force. Thus the enhanced warm meridional advection in connection with the warming over the Tibetan Plateau lead to early seasonal transition over the BOB region.
高空大气通过热力适应过程对这种异常对流加热的响应是产生异常反气旋环流，则高原上空的位势高度偏高，温度偏高，引起季节转换偏早；暖池海温异常偏高的另一作用是，它激发出异常强的季风纬向环流，在高层，季风纬向环流受到柯氏力作用又使得南风加强，导致孟加拉湾东部地区经向暖平流及其北部下沉增温加强，加速了孟加拉湾季节转换进程。
Besides, in the range of validity of weakly nonlinear theory the momentum transport, the mean meridional circulation and acceleration (or deceleration) of the mean flow caused by the disturbance is easily calculated by using the spectral function method.
其次，在弱非线性理论可应用的范围内，扰动所引起的动量传输、平均经圈环流以及基流的改变都可以较方便地用按谱函数展开的方法求得。
The monsoon circulation can be decomposed into the zonal circulation and the meridional circulation.
季风环流可以分解为经向环流和纬向环流。
This paper presents a flow model of thc variable meridional velocity design for mixed-flow pumps. The flow pattern function equation which describes meridional velocity and circumferential direction velocity (circulation capacity) of the mixed-flow pumps is derived.
本文提出了混流泵变轴面速度设计的流动模型，建立了混流泵轴面速度与周向速度（环量）间的定量关系式&流型方程式；
Such local meridional circulation leads to the dry climatology over the two deserts.
正是这种局地经圈环流导致了该两处干旱气候的形成。
This paper investigates the dry climatology of Sahara and Northwest China deserts from the viewpoint of local meridional circulation with Xie and Arkin rainfall dada and NCAR/NCEP reanalysis data.
应用Xie和Arkin降水资料和NECP／NCAR再分析资料，研究了撒哈拉和中国西北沙漠地区的干旱气候。
The years with colder water in the key region in spring, the Eurasian high air systems are stronger, the meridional circulation increased, lower Mongolian cyclones are favorite to guide the cold air to the south and lead to more sandstorms occurrence.
关键海区冷水年春季，欧亚大陆高空系统较强，环流经向度加大，蒙古气旋加深，有利于极地冷空气南下，为西北沙尘暴的发生发展创造了有利气候条件。
The monthly average of Eurasian meridional circulation index from last Jul. to this Jan. is 7 less;
上年7月至当年1月欧亚经向环流指数月平均值偏小7；
Furthermore, composite analysis indicates that winter sea-ice anomaly is closely associated with the general circulation which gives rise to the change of pressure gradient, meridional and vertical eddy heat flux and baroclinicity, accordingly, influence on the storm track vigor and the center migration.
进一步的合成分析显示，海冰异常使得大气环流调整，气压梯度、天气尺度涡动热量的经向通量和垂直通量、局地斜压性均发生改变，从而对风暴轴的强度及中心的位移造成影响。
On one hand, it changes the distribution of meridional wind, thus the geostrophic vortivity develops in the ridge region on the south of the subtropical high at 500 hPa. On the other hand, it causes inhomogeneity of the vertical distribution of diabetic heating, triggering anomalous cyclonic circulation between two ridges and anticyclonic circulation in the ridge region on the south.
这一方面改变了经向风的分布，使500 hPa副高南侧脊线区域地转涡度平流项发展；另一方面引起非绝热加热垂直分布不均匀，在两脊线之间诱生一异常气旋性环流，在南侧脊线区生成异常反气旋环流。
In terms of the real data, the mass stream function is calculated by two methods, results indicate that both methods fit well with the need for calculating the climate and its anomaly of the mean meridional circulation.
本文通过实际资料的计算比较了质量流函数的两种计算方案，验证了简化方法同样适用于平均经圈环流的气候及其异常的分析需要。
The meridional structure of the vertical circulation over the path of cross equatorial air current
越赤道气流通道上的经向垂直环流结构
When low index circulation prevails over subtropics and tropics in Eastern Asia, there is meridional circulation in the southern hemisphere (especially in Australia), and there is a mass transport from the southern to northern hemisphere.
在东亚低纬度经向环流期间，南半球（特别在澳洲）也盛行经向环流，并且在澳洲附近从南半球向北半球的质量输送也最强烈；
Results show that the low-frequency cycle of the zonal wind dipole is accompanied by the east-west shift of the eastern Asian westerly jet core and low-frequency meridional circulation at the jet entrance is important to the oscillation in zonal wind.
发现纬向风偶极子的低频循环伴随着东亚西风急流中心的东西摆动，在急流入口区的低频经圈环流对于纬向风振荡有重要作用。
Transient Response of the Atlantic Meridional Overturning Circulation to the Enhanced Freshwater Forcing and Its Mechanism
高纬度淡水强迫增强背景下大西洋经向翻转环流的响应及其机制
The results show that the advance and retreat of the Western Pacific Subtropical High are closely connected with the variation of the meridional circulation.
结果指出，副高的进退与经圈环流的调整有着密切的关系。