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westerly region
相关语句
  西风区
     Study on Magnetic Susceptibility of Loess and Paleosol Sequences in Westerly Region of Xinjiang
     新疆西风区黄土与古土壤磁化率变化特点
短句来源
     In the mean westerly region the amplititude of the atmospheric Kelvin wave damps. However .
     在平均西风区,大气Kelvin波振幅衰减。
短句来源
     In the westerly region, the atmospheric Kelvin wave damps.
     在西风区大气Kelvin波振幅衰减。
短句来源
     In the westerly region, the long Rossby wave whose wave number is smaller than a critical value amplifies, but the short Rossby wave damps.
     在西风区,波数小于某临界波数的长Rossby波振幅增大,而短的Rossby波振幅衰减。
短句来源
  相似匹配句对
     In the westerly region, the atmospheric Kelvin wave damps.
     在西风区大气Kelvin波振幅衰减。
短句来源
     shock region.
     三个区域对应了时域的激波形成。
短句来源
     Function of Region
     区域函数
短句来源
     Study on Magnetic Susceptibility of Loess and Paleosol Sequences in Westerly Region of Xinjiang
     新疆西风区黄土与古土壤磁化率变化特点
短句来源
     The Study of Westerly Belt
     西风带研究动态
短句来源
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  westerly region
In the strong westerly region, the jet had a westerly component.
      
However, the eastern end of the westerly region over the equator is met by an easterly of the same kind of magnitude.
      


In this work a simple coupled air-sea model is developed. The atmosphere is a linear beta-plane approximation model which is devided into two-layers vertically . The interaction between convective condensational heating and large scale flow as well as the feedback between evaporation, sensible heating and perturbation wind is considered in the diabatic heating term . Also,the difference between the easterly and westerly regions in the parameterization of evaporation and sensible heating is taken into consideration....

In this work a simple coupled air-sea model is developed. The atmosphere is a linear beta-plane approximation model which is devided into two-layers vertically . The interaction between convective condensational heating and large scale flow as well as the feedback between evaporation, sensible heating and perturbation wind is considered in the diabatic heating term . Also,the difference between the easterly and westerly regions in the parameterization of evaporation and sensible heating is taken into consideration. As we only consider the zonal motion of the tropical atmosphere , so only the Kelvin wave is included in the model atmosphere. The ocean is a reduced gravity model. Within a limitation the geostrophic approximation can be applied, therefore only the Rossby wave is kept in the model ocean. Through the eigenmode analysis of this coupled model ,it is shown that the coupled interaction between air and sea does not change the characteristics of the atmospheric wave significantly. In the mean easterly region of the east Pacific, the atmospheric Kelvin wave still enhances its amplititude and expands eastward. In the mean westerly region the amplititude of the atmospheric Kelvin wave damps. However . the coupling causes the characteristics of the oceanic Rossby wave to change significantly . In the mean westerly region . the ampli-tiude of long Rossby wave whose wave length is larger than a critical value expands ,but the amplititude of short Rossby wave damps. In the mean easterly region the conclusion is opposite. This theory shows that the formation of the west Pacific warm pool is related to oceanic Rossby wave. In the mean easterly region of the east Pacific the amplititude of short Rossby wave enhances, so there is no large "warm pool "in that region . On the contrary, perhaps there may form a large "warm pool"in the west Pacific .

建立了一个简单海气耦合模式,其中大气垂直分为两层,为-β平面近似线性模式。在非绝热加热项中包含了对流凝结潜热与大尺度流场之间相互作用的CISK机制以及蒸发、感热与扰动风场之间的反馈机制,并考虑了平均东风区和西风区的不同。由于只研究大气的平均纬向运动,故模式大气中仅含有Kelvin波。海洋模式为一约化重力模式,在一定条件下采用准地转近似,模式海洋中仅保留了Rossby波。对这一海气耦合模式进行特征波动分析,发现海气耦合并不显著改变大气波动的性质。在中东太平洋的平均东风区,大气的Kelvin波仍然增幅和东传。在平均西风区,大气Kelvin波振幅衰减。但耦合作用却使海洋Rossby波的性质发生变化,且波长超过某一临界波长Le的Rossby波的振幅增长。在平均东风区,结论相论。这一理论说明西太平洋暖池的形成与海洋Rossby波有关。在东太平洋,由于是平均东风区,短的Ross-by波振幅增长,不能形成水平尺度很大的“暖池”。而在平均西风的西太平洋区,有可能形成水平尺度很大的“暖池”。

In this paper a simple coupled oceanatmosphere model is developed. The atmosphere is a βplane approximation model which is divided into two layers vertically. The interaction between convective condensational heating and large scale flow as well as the feedback among evaporation, sensible heating and perturbation wind is considered in the diabatic heating term. Also, the difference between the easterly and westerly in the parameterization of evaporation and sensible heating is taken into consideration. As...

In this paper a simple coupled oceanatmosphere model is developed. The atmosphere is a βplane approximation model which is divided into two layers vertically. The interaction between convective condensational heating and large scale flow as well as the feedback among evaporation, sensible heating and perturbation wind is considered in the diabatic heating term. Also, the difference between the easterly and westerly in the parameterization of evaporation and sensible heating is taken into consideration. As we only consider the zonal motion of the tropical atmosphere, only the Kelvin wave is included in the model atmosphere. The ocean is a reducedgravity model in which only the Rossby wave is kept. Through the eigenmode analysis, it is shown that the coupling of ocean and atmosphere does not change the stability characteristics of the atmospheric Kelvin wave. In the easterly region, the atmospheric Kelvin wave still amplifies and propagates eastwards. In the westerly region, the atmospheric Kelvin wave damps. But the coupling slows down the speed of atmospheric Kelvin wave and enlarges its period. However, the coupling makes the neutral oceanic Rossby wave become a nonneutral one. In the westerly region, the long Rossby wave whose wave number is smaller than a critical value amplifies, but the short Rossby wave damps. In the easterly region the conclusion is opposite. The eignmode analysis of wave characteristics provides the foundation for the numerical simulation later.

试图建立一个简单海气耦合模式,其中大气垂直分为两层,为-β平面近似线性模式。在非绝热加热项中包含了对流凝结潜热与大尺度流场之间相互作用的CISK机制以及蒸发、感热与扰动风场之间的反馈机制,并考虑了东风区与西风区的不同。由于只研究大气的平均纬向运动,故模式大气中仅含有Kelvin波。海洋模式为一约化重力模式,只保留了Rossby波。对这一海气耦合模式进行特征波动分析,发现考虑海气耦合效应并不影响大气波动的性质,在东风区大气Kelvin波仍然增幅和东传;在西风区大气Kelvin波振幅衰减。但海气耦合效应却使得大气Kelvin波的传播速度减慢,周期增大。当考虑海气耦合效应时,海洋Rossby波的稳定性质发生变化,由原来的中性波动变为非中性波动。在西风区,波数小于某临界波数的长Rossby波振幅增大,而短的Rossby波振幅衰减。在东风区结论相反。对海气耦合模式中波动的分析,为数值模拟西太平洋暖池的形成及其对大气扰动的影响建立了理论基础。

The magnetic susceptibility has been used as an index of summer monsoon strength which varies with orbitally forced solar radiation in the Loess Plateau. Many scientists think that the precipitation-driven pedogenesis is largely responsible for the production of ultrafine-grained magnetic minerals that strongly influence the strength of the magnetic susceptibility signal in the loess and paleosol sequence. For this reason, paleosols usually have higher magnetic susceptibility than the loess. The stronger the...

The magnetic susceptibility has been used as an index of summer monsoon strength which varies with orbitally forced solar radiation in the Loess Plateau. Many scientists think that the precipitation-driven pedogenesis is largely responsible for the production of ultrafine-grained magnetic minerals that strongly influence the strength of the magnetic susceptibility signal in the loess and paleosol sequence. For this reason, paleosols usually have higher magnetic susceptibility than the loess. The stronger the summer monsoon is, the higher the magnetic susceptibility is. Variations in magnetic susceptibility correlate closely with the global marine {}+{18}O record too. The Heinrich events and the interstadials happened at the North Atlantic Ocean and Greenland have left their signature in the Chinese loess records. This implies that the climate changes in the high latitude Northern Hemisphere may significantly affect the intensity of the Chinese monsoon systems and the climates of the North Atlantic and China were linked by the effect of westerly winds. However, few studies on the magnetic susceptibility of loess and paleosol have been done in the westerly region of Xinjiang. This will hinder the understanding to the global change well.;The investigation of two typical loess sections in Yili area where the westerly circulation is prevailing shows that there are some differences on magnetic susceptibility of loess and paleosol between monsoon region and westerly region and regional features as well. Zeketai section is located in the desert steppe zone where the annual precipitation is lower than 300 mm. It is different from the monsoon areas that most pedogenic layers during the Last Glaciation have relatively low magnetic susceptibility values, whereas the values of the loess layers are relatively high. On the contrary, the contents of the carbonate of the poorly developed paleosols are higher than those of the loess. The content of carbonate is negatively related to the value of magnetic susceptibility. At the upper of the paleosol that formed during the interglaciation the magnetic susceptibility is lower than the value of loess. Kuerdenengbulake section is situated at the steppe zone where the annual precipitation is larger than 400mm. Being similar to the Loess Plateau, the peaks in magnetic susceptibility and pedogenic layers identified in the field coincide very well. Contrast to that of desert steppe, the paleosols from steppe zone can be distinguished from the loess by decarbonation and high magnetic susceptibility values.;On the one hand the regional features of magnetic susceptibility from both loess sections may mean the differences of the precipitation-driving pedogenisis, on the other hand it indicates that the origin of magnetic susceptibility is complex. At the inland the climate was dry whether the cold or warm periods during the Last Glaciation. During the cold periods the temperature was low and the evaporation was weaker, thereby the humid may be relatively high. In contrast to the cold periods, both the evaporation and carbonate accumulation were stronger. This may result in the low humid. The author do not think it is good to directly adopt the method that have been used in the monsoon region when the studies are done in the westerly region, but the magnetic susceptibility can be an indicator of humid change to a certain degree.

在东部季风区的黄土研究中 ,磁化率是反映季风区气候变化的重要替代性指标之一 ,但关于中国西风区黄土磁化率的研究至今仍然为空白。通过对新疆典型的西风区———伊犁地区现代土壤和两个典型剖面黄土与古土壤序列磁化率研究发现 ,两个剖面黄土与古土壤磁化率特征存在差别。地处荒漠草原地带的则克台黄土剖面中马兰黄土的磁化率值略高于弱成壤层 ,末次间冰期古土壤层的上部磁化率也低于黄土 ,与东部季风区相比黄土磁化率偏高 ;而位于草原地带的库尔德能布拉克剖面黄土磁化率为低值 ,古土壤为高值 ,表现出与东部季风区类似的变化特点。两个黄土剖面所反映的磁化率的区域差异在一定程度上揭示了气候对磁化率变化的控制作用 ,但另一方面也反映了该区磁化率物理意义的复杂性。提出虽然在西风区黄土记录研究中不能简单套用东部季风区的方法 ,但磁化率和碳酸盐含量在西风区可指示湿度变化。

 
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