查询词典 troposphere

In this paper, a method for diagnosing temperature advection in mid-and-upper troposphere is proposed, with which the advection magnitudes between 700 and 300 hPa in several cases are analysed.

本文提出了对流层中上层温度平流的一种诊断方法。应用这一方法分析了一些例子中700—300 hPa间的平流值。

In the upper troposphere the isentropic potential vorticity advection contributed to the cyclogenesis and its effect was limited.

另外，对流层高层位涡平流也是气旋发展的一个强迫因素，但其影响较小。

A high-speed high-altitude airstream blowing from west to east near the top of the troposphere; has important effects of the formation of weather fronts.

一种高速、高海拔的风流，通常在对流层的最高处从西向东刮；对锋面的形成有重要影响。

Chlorofluorocarbons and hydrochloroflorocarbons are oxidated in the stratosphere and troposphere respectively.

两类物质分别在同温层和对流层氧化降解。

Results show that existence from strong convergence of water vapor and the conditional convective instability in the middle and low troposphere probably provided the suitable environment for heavy rainfall.

分析表明，对流层中低层水汽的大量集中以及对流不稳定条件的存在可能对此类系统发展提供了有利环境，对其启动的机制作了初步的讨论，认为地形的动力强迫和地面冷锋以及低空急流扰动可能对此类系统的发生发展起了触发作用。

In terms of the synoptic environment and precipitation characteristics, there were some common characteristics in these two cases. For instance, warm and moist air with the conditional instability atmosphere in the lower troposphere, it was associated with the highest equivalent potential temperature gradient and strong moisture contrast to below 700 hPa. The lower-level convergence was the major produced mechanism of MCS and the low-level southwesterly flow generated convective instability.

从综观环境条件与降水特徵显示，两个案共通特徵包括（1）低对流层属暖湿条件性不稳定大气，（2）最大相当位温梯度以及水气梯度分布於700 hPa以下，（3）低层辐合均为个案中MCS之重要激发机制，（4）有明显低层西南喷流，大气呈现对流性不稳定状态，（5）中层短波槽线的移入，以及（6）高层辐散分流场的存在，提供MCS发展的有利环境条件。

Through analysis of potential vorticity in isobaric surface field, in high-troposphere a positive potential vorticity disturbance before rainstorm generation;positive potential vorticity disturbance in high-troposphere downward, form one vertical disturbance column, now corresponding precipitation develop stage;When near ground arises negative potential vorticity disturbance, precipitation also weaken.

通过对等压面的位涡分析，发现在暴雨发生发展时，在对流层高层有正位涡向下扰动，在暴雨的发展鼎盛阶段，从对流层中高层到地面形成一个垂直扰动柱；位涡柱对地面气旋的发展有较好的指示性，位涡柱形成时刻前后降水达到最强；当近地面出现负的位涡扰动时，降水随之减弱。

It is also shown that one of the most important reasons of the heavy rain amplification is the cold air which spreads to south from midlatitude in the lower troposphere and transports into the typhoon low pressure. The study of PV on isentropic surface shows the active state of the midlatitude cold air. The tropopause folding, which means that high PV spreads downward from the upper troposphere or stratosphere, helps the releasing of potential instability energy and the development of rainstorm.

分析表明：对流层低层中高纬度冷空气扩散南下在台风低压环流区附近的"侵入"作用是此次特大暴雨过程的最重要的原因之一；等熵面位涡的分析进一步说明了中高纬地区冷空气的活动状况；对流层高层或平流层低层高位涡的下传有利于位势不稳定能量的释放，使得暴雨增幅。

For the climatic characteristics of the onset of the SCS summer monsoon, results reveal: 1 the SCS summer monsoon brusts at the 4th pentad in May; 2 the onset of the SCS summer monsoon is closely related to the southwesterly monsoon over the eastern Bay of Bengal, as induced by the intensification and eastward advancement of the latter; 3 the rainy season of the SCS summer monsoon bursts after the onset of the SCS summer monsoon basically; and 4 the atmospheric circulations exhibit rapid changes at different heights over the SCS and its adjacent districts, during the establishment peroid of the SCS summer monsoon, these include: i in lower troposphere, the southward expansion and deepening of the Indo-Burma trough; ii in middle troposphere, the rapid easterward retreat of the western Pacific subtropicl high form the SCS region, iii in upper troposphere, the fast radiation of the easterlies form the center of the SCS region to the whole of it apparently.

对于南海夏季风建立的气候特征，研究发现：(1)南海夏季风的建立具有爆发性，爆发的时间是5月第4候。(2)南海夏季风的建立与孟加拉湾东部西南季风有密切的关系，是孟加拉湾西南季风发展和东移的结果。(3)南海的夏季风雨季基本上是随着夏季风建立而建立的。(4)在南海夏季风建立期间，南海及其邻近地区高低空环流都有急速的变化，在对流层低层表现为印缅槽的南扩和加深，在对流层中层表现为西太平洋副热带高压迅速东移撤出南海地区，在对流层高层最明显的变化是东风带迅速地从南海中部向北扩展到整个南海地区。

Analyses of the EAWJ seasonal variation and the atmospheric meridional temperature gradient in the mid-upper troposphere indicate that the EAWJ center always corresponds to the largest meridional temperature gradient in the mid-upper troposphere, suggesting that the seasonal variation of EAWJ is a response to the meridional temperature difference.

分析急流与对流层中上层经向温度梯度的季节变化发现，急流出现的位置总是对应着经向温度梯度较大区域，急流中心有随气温南北差异大值中心移动的趋势，急流中心与最大温差中心相对应，表明急流中心的位置变化是对气温南北差异季节变化的响应。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。