共查询到20条相似文献，搜索用时 812 毫秒
1.
A Diagnostic Study of Explosive Development of Extratropical Cyclone over East Asia and West Pacific Ocean 总被引：9，自引：0，他引：9
ＡＤｉａｇｎｏｓｔｉｃＳｔｕｄｙｏｆＥｘｐｌｏｓｉｖｅＤｅｖｅｌｏｐｍｅｎｔｏｆＥｘｔｒａｔｒｏｐｉｃａｌＣｙｃｌｏｎｅｏｖｅｒＥａｓｔＡｓｉａａｎｄＷｅｓｔＰａｃｉｆｉｃＯｃｅａｎ￥ＪｉａＹｉｑｉｎ（贾逸勤）ａｎｄＺｈａｏＳｉｘｉｏｎｇ（赵思雄）（... 相似文献
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ＴｈｅＰｒｅｓｅｎｔＳｔａｔｕｓａｎｄＦｕｔｕｒｅｏｆＲｅｓｅａｒｃｈｏｆｔｈｅＥａｓｔＡｓｉａｎＭｏｎｓｏｏｎＭａＨｅｎｉａｎ（马鹤年）ＣｈｉｎａＭｅｔｅｏｒｏｌｏｇｉｃａｌＡｄｍｉｎｉｓｔｒａｔｉｏｎ，Ｂｅｉｊｉｎｇ１０００８１ＤｉｎｇＹｉｈｕｉ... 相似文献
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ＮｕｍｅｒｉｃａｌＭｏｄｅｌｌｉｎｇｏｆｔｈｅＥｆｆｅｃｔｓｏｆＯｚｏｎｅｏｎｔｈｅＳｕｍｍｅｒＡｔｍｏｓｐｈｅｒｉｃＣｉｒｃｕｌａｔｉｏｎＷａｎｇＱｉａｎｑｉａｎ（王谦谦）；ＷａｎｇＹｉｎｈｕｉ（汪迎辉）；ＳｏｎｇＹｕ（宋煜）（Ｎａｍｉｎｇｉｎｓｔ... 相似文献
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Shingo Yamada Forecast Division Japan Meteorological Agency Tokyo Japan Shuhei Maeda Administration Division Climate Marine Department Japan Meteorological Agency Tokyo Japan K. Gambo c/o Department of Earth Planetary Physi 《大气科学进展》1997,(1)
ＮｏｔｅｓｏｎＥｘｔｅｎｄｅｄ－ＲａｎｇｅＡｔｍｏｓｐｈｅｒｉｃＰｒｅｄｉｃｔｉｏｎｉｎｔｈｅＮｏｒｔｈｅｒｎＨｅｍｉｓｐｈｅｒｅＷｉｎｔｅｒＳｈｉｎｇｏＹａｍａｄａＦｏｒｅｃａｓｔＤｉｖｉｓｉｏｎ，ＪａｐａｎＭｅｔｅｏｒｏｌｏｇｉｃａｌＡｇｅｎｃｙ... 相似文献
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Ｉ．ＩＮＴＲＯＤＵＣＴＩＯＮＥａｓｔＡｓｉａｉｓｓｉｔｕａｔｅｄｉｎｔｈｅｅａｓｔｅｒｎｐａｒｔｏｆｔｈｅＥｕｒａｓｉａｎｃｏｎｔｉｎｅｎｔｗｈｅｒｅｔｈｅｈｕｇｅＴｉｂｅｔａｎＰｌａｔｅａｕｅｘｉｓｔｓ．Ｆａｃｉｎｇｅａｓｔａｎｄｓｏｕｔｈｅａｓｔ... 相似文献
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《中国气象科学研究院年报》1994,(1)
ＡＮＩＮＦＥＲＥＮＣＥＯＦＴＨＥＴＥＭＰＥＲＡＴＵＲＥＩＮＴＨＥ１３ＴＨＣＥＮＴＵＲＹＯＦＣＨＩＮＡＺｈａｎｇＤｅ’ｅ（张德二）ＣｅｎｔｅｒｆｏｒＣｌｉｍａｔｉｃＲｅｓｅａｒｃｈＥＸＴＥＮＤＥＤＡＢＳＴＲＡＣＴＳｉｎｃｅｔｈｅｔｈｅｒｍａｌｏｐｔｉｍ... 相似文献
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ＳｏｍｅＡｓｐｅｃｔｓｏｆｔｈｅＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＭｏｎｓｏｏｎＤｉｓｔｕｒｂａｎｃｅｓＵｓｉｎｇａＣｏｍｂｉｎｅｄＢａｒｏｔｒｏｐｉｃ－ＢａｒｏｃｌｉｎｉｃＭｏｄｅｌ￥Ｎ．Ｒ．ＰａｒｉｊａａｎｄＳ．Ｋ．Ｄａｓｈ（ＣｅｎｔｒｅｆｏｒＡ... 相似文献
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Effect of the Interaction of Different Scale Vortices on the Structure and Motion of Typhoons 总被引：13，自引：1，他引：13
ＥｆｆｅｃｔｏｆｔｈｅＩｎｔｅｒａｃｔｉｏｎｏｆＤｉｆｆｅｒｅｎｔＳｃａｌｅＶｏｒｔｉｃｅｓｏｎｔｈｅＳｔｒｕｃｔｕｒｅａｎｄＭｏｔｉｏｎｏｆＴｙｐｈｏｏｎｓＣｈｅｎＬｉａｎｓｈｏｕ（陈联寿）（ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＭｅｔ６ｏｒｏｌｏｇｉｃ... 相似文献
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Effects of Land-Sea Distribution, Topography and Diurnal Change on Summer Monsoon Modeling 总被引：2，自引：0，他引：2
Ｅｆｆｅｃｔｓ ｏｆ Ｌａｎｄ－Ｓｅａ Ｄｉｓｔｒｉｂｕｔｉｏｎ， Ｔｏｐｏｇｒａｐｈｙ ａｎｄ Ｄｉｕｒｎａｌ Ｃｈａｎｇｅ ｏｎ Ｓｕｍｍｅｒ Ｍｏｎｓｏｏｎ ＭｏｄｅｌｉｎｇＷａｎｓＱｉａｎｑｉａｎ（ＮａｍｉｎｇＩｎｓｔｉｔｕｔｅｏｆＭｅｔｅｏ... 相似文献
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In this paper, the dynamical effects of divergent wind on the intraseasonal variability of atmospheric circulation over East Asia are analyzed by using the function of Rossby-wave source and the energy exchanging function be-tween divergent component and rotational component of the flow.The results analyzed from the observed data show that the advection of vorticity by divergent wind caused by the heating due to the monsoon rainfall in the south to the Yangtze River and the strong convective activities around the Philippines may play an important role in the northward jump of westerly jet stream during the seasonal transition from spring circulation to summer circulation over East Asia. Due to the northward movement of the advection of vorticity by the divergent wind, the energy transformation from divergent component into rotational component can be caused over the Yellow River basin and Northwest China and will cause the intensification of the zonal flow there. Thus, the jet stream abruptly shifts northward to North China.Moreover, the analysed results also show that the advection of vorticity by divergent wind caused by the heating due to the strong convective activities around the Philippines also plays an important role in the intraseasonal varia-bility of the circulation over East Asia during the seasonal transition from summer to winter. With the southward movement of the advection of vorticity by the divergent wind, the energy transformation from divergent component into rotational component can be caused over East Asia, especially over the Yangtze-Huaihe River basin. Therefore, the jet stream gradually moves southward from North China to the Yangtze River basin. 相似文献
12.
Seasonal Variation of the Meridional Wind in the Temperate Jet Stream and Its Relationship to the Asian Monsoon 
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下载免费PDF全文 The features of the temperate jet stream including its location, intensity, structure, seasonal evolution and the relationship with the Asian monsoon are examined by using NCEP/NCAR reanalysis data. It is indicated that the temperate jet stream is prominent and active at 300 hPa in winter over the region from 45°-60°N and west of 120°E. The temperate jet stream is represented by a ridge area of high wind speed and dense stream lines in the monthly or seasonal mean wind field, but it .corresponds to an area frequented by a large number of jet cores in the daily wind field and exhibits a distinct boundary that separates itself with the subtropical jet. A comparison of the meridional wind component of the temperate jet stream with that of the subtropical jet shows that the northerly wind in the temperate jet stream is stronger than the southerly component of the subtropical jet, which plays an important role in the temperate jet stream formation and seasonal evolution, and thus the intensity change of the meridional wind component can be used to represent the temperate jet stream＇s seasonal variation. Analysis of the temperature gradient in the upper troposphere indicates that the temperate jet stream is accompanied by a maximum zonal temperature gradient and a large meridional temperature gradient, leading to a unique jet stream structure and particular seasonal evolution features, which are different from the subtropical jet. The zonal temperature gradient related to the land-sea thermal contrast along the East China coastal lines is responsible for the seasonal evolution of the temperate jet. In addition, there exists a coordinated synchronous change between the movement of the temperate jet and that of the subtropical jet. The seasonal evolution of the meridional wind intensity is closely related to the seasonal shift of the atmospheric circulation in East Asia, the onset of the Asian summer monsoon and the start of Meiyu in the Yangtze and Huaihe River Valleys, and it correlates well with summer and wint 相似文献
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We partition the observed wind field into rotational and divergent wind fields to analyze the stream field of Typhoon Polly(No.9216),which landed on 31 August 1992 and caused severe weather and large damage in the eastern China.The results indicate that the preservation of typhoon intensity after landing and the heavy rainfall took place onthe northern periphery of typho on are due to the strong divergent winds on the regions of low level jet(LLJ) and high level jet(HLJ) around the typhoon.The direction of divergent winds in the LLJ is perpendicular to the observed wind.But,the direction of divergent winds around the HLJ axis is parallel to the observed winds.The stream function and the rotational wind corresponding to the horizontal vorticity display the vertical circulation associated with the heavy rain,which is stronger than the vertical circulation around the typhoon center.The three-dimensional trajectories exhibit the warm and moist air parcels of LLJ traveling northward into the heavy rainfall region and ascending,then turning eastward in the HLJ. 相似文献
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Effects of intraseasonal oscillation on the anomalous East Asian summer monsoon during 1999 总被引：2，自引：0，他引：2
The 1999 East Asian summer monsoon was very unusual for its weak northward advance and remarkably anomalous climate conditions. The monsoonal southwesterly airflow and related rain belt in East Asia were blocked south of the Yangtze River Valley. The monsoonal airflow and major moisture transport conduct shifted eastward and turned northward to Japan from the tropical western Pacific rather than to East China from the South China Sea （SCS） as in normal years. Severe and prolonged drought occurred over extensive areas of North China and heavy precipitation in South China and Japan. The investigation on the possible intrinsic mechanisms related to such an anomalous monsoon year has shown that the unique behavior of intraseasonal oscillation may play an essential role during this process. During this year, the northward propagation of 30-60-day anomalous low-level cyclone/anticyclone collapsed in the region around 20°N and did not extend beyond the latitudes of the Yangtze River basin due to the barrier of strong cold air intrusion from the mid-latitudes. The southwesterly moisture flux on the northwestern flank of the anticyclonic moisture transport system in the western North Pacific, which was regulated by the northward shift of 30-60-day cyclonic/anticyclonic moisture transport, also did not reach the region north of 30°N as well. Under this circumstance, the weak northward advance of the monsoon westerlies and associated northward moisture transport could not arrive in North China and led to the severe droughts there in 1999. The SCS and South China were mostly affected by the airflow in the southern and northern flanks of the same 30-60-day cyclones or anticyclones, respectively, and thus controlled by the nearly reverse zonal wind and moisture convergent/divergent conditions. The rainfall in the SCS and South China showed out-of-phase oscillation through the transient local Hadley circulation, with the rainfall maximum occurring in the SCS （South China） when the 30-60-day anticyclone （cyclone） r 相似文献
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梅雨雨带北跳过程研究 总被引：2，自引：0，他引：2
利用1979～2007年逐日再分析资料和高分辨率逐日降水资料,通过定义确定了每年梅雨雨带北跳的日期,对梅雨雨带的北跳过程及其可能的物理机制进行了研究。分析结果表明:梅雨雨带北跳日期存在明显的年际变化,本文合成得到的雨带北跳过程与前人的工作相一致。水汽输送的变化和对流层中层的垂直运动是影响梅雨雨带位置分布的关键因素。Omega方程诊断结果表明,在梅雨雨带北跳前期,对流层高层的环流异常导致江淮流域出现异常下沉运动,不利于梅雨雨带的北跳;而涡度方程的诊断结果表明,江淮流域的异常下沉运动导致的非绝热冷却在中国东部的对流层低层引起异常反气旋涡度倾向,有利于副热带高压西伸,从而有利于梅雨雨带的北跳。因此,当对流层高层环流发生变化（主要受纬向涡度平流影响）,使得江淮流域的异常下沉运动转变为异常上升运动时,高低层相互配合,造成了梅雨雨带的突然北跳。 相似文献
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本文对非地转风在东亚冬季冷空气活动过程中的作用及影响非地转风的主要因子等问题进行了初步研究，并讨论了非地转风在有限区动能收支中的作用。结果表明，非地转风是冷空气过程中地面偏北大风加强的主要原因之一，非地转风次级环流使东亚高空西风急流和Hadley环流得以加强，而高空西风急流具有次地转的特征。变高、惯性平流和摩擦作用是影响非地转风的主要因子。此外，位温局地变化，位温平流和非绝热作用对非地转风的形成亦有相当大的贡献，但该三项非地转风分量的向量和接近于零。非地转风在有限区动能的收支中也起着十分重要的作用。 相似文献
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北大西洋-东亚和北亚（简称NAENA）型遥相关是夏季欧亚大陆对流层上层经向风异常的第二主导模态,对欧亚大陆多尺度气候变率有显著影响。本文在分析NAENA型维持的动力学机制的基础上,研究了该遥相关型对新疆夏季旱涝异常的影响及其可能机制。大气波列的涡度收支分析表明,气候态的旋转纬向风引起的扰动涡度平流可以被扰动旋转经向风引起的平均涡度平流所补偿。能量转换过程分析表明,该大气波列有效地从平均流中提取有效位能,通过斜压能量转换过程得以维持。大西洋海温异常三极子模态则是NAENA型维持的重要外强迫因子。回归分析表明NAENA型遥相关能通过促进南疆夏季降水,显著影响新疆的旱涝异常。NAENA型位于中亚的气旋性低压一方面增强了南疆地区的垂直上升运动,同时气旋性环流将更多的水汽输送到该地区,有利于水汽在对流层中低层的异常辐合,进而对南疆的降水有促进作用。 相似文献
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利用欧洲中期预报中心再分析数据和中国气象局提供的降水数据分析了2008年1月到2月初东亚急流对我国南方雨雪冰冻灾害的影响,并给出东亚急流变化可能的原因。东亚急流强度和位置的变化引起其入口区的垂直运动的变化,从而使得我国南方降雨的位置和强度发生改变。为了研究灾害发生期间东亚急流变化的原因,利用扰动动能方程分析了与东亚急流有关扰动动能以及方程各项的变化,结果表明：扰动动能的变化能够很好的表示东亚急流的变化;扰动位势平流对扰动动能的发展至关重要。东亚急流北部弱风区存在较小的扰动动能中心,位势通量矢量将这个中心的扰动动能输送到东亚急流的入口区并辐合,使得东亚急流增强。 相似文献
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华东地区强对流降水过程湿斜压涡度的诊断分析 总被引：4，自引：3，他引：1
湿斜压涡度(Moist Baroclinic Vorticity,MBV)、湿热力斜压涡度(Moist Thermodynamic Baroclinic Vorticity,MTBV)及湿位涡(Moist Potential Vorticity,MPV)是能够完整表征涡度三维信息的物理量,其中MBV代表切变风对湿比容的平流输送作用,MTBV反映了垂直气压梯度、对流稳定度、风垂直切变与湿比容水平梯度之间的耦合效应。本文利用这些物理量对2009年8月17日发生在华东地区的一次强对流降水过程进行了诊断分析。该过程是在高空急流、中层浅槽和低空切变线的密切配合下产生的,共经历了"团状结构—带状结构—团状结构"三个发展阶段。诊断结果表明,MPV、MBV和MTBV的异常值区与降水落区有较好的对应关系;随着强对流降水的发展演变,MPV、MBV和MTBV都产生了相应的变化,MPV、MBV和MTBV对降水和对流系统有追踪指示意义。相对而言,在反映降水强度变化方面,MBV和MTBV比MPV更具优势。 相似文献