共查询到20条相似文献，搜索用时 140 毫秒
1.
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
2.
Lu Peisheng 《大气科学进展》1995,12(3):311-318
卢佩生ＥｖｏｌｕｔｉｏｎｏｆＡｓｉａｎＳｕｍｍｅｒＭｏｎｓｏｏｎａｎｄｔｈｅＳｌｏｗｌｙＶａｒｙｉｎｇＤｉｓｔｕｒｂａｎｃｅｓ￥ＬｕＰｅｉｓｈｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅ... 相似文献
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ＴｈｅＰｒｅｓｅｎｔＳｔａｔｕｓａｎｄＦｕｔｕｒｅｏｆＲｅｓｅａｒｃｈｏｆｔｈｅＥａｓｔＡｓｉａｎＭｏｎｓｏｏｎＭａＨｅｎｉａｎ（马鹤年）ＣｈｉｎａＭｅｔｅｏｒｏｌｏｇｉｃａｌＡｄｍｉｎｉｓｔｒａｔｉｏｎ，Ｂｅｉｊｉｎｇ１０００８１ＤｉｎｇＹｉｈｕｉ... 相似文献
4.
This research is supported by the Research Grants Council of the University Grants Committee of Hong Kong Grant . C. H. So Johnny C. L. Chan Department of Physics Materials Science City University of Hong Kong 《大气科学进展》1997,(2)
ＲｅｇｉｏｎａｌａｎｄＳｙｎｏｐｔｉｃ－ｓｃａｌｅＦｅａｔｕｒｅｓＡｓｏｃｉａｔｅｄｗｉｔｈＩｎａｃｔｉｖｅＰｅｒｉｏｄｓｏｆｔｈｅＳｕｍｍｅｒＭｏｎｓｏｏｎｏｖｅｒＳｏｕｔｈＣｈｉｎａ①Ｃ．Ｈ．ＳｏａｎｄＪｏｈｎｎｙＣ．Ｌ．ＣｈａｎＤｅｐａｒｔｍｅ... 相似文献
5.
ＲｏｌｅｏｆＴｒｉａｄＫｉｎｅｔｉｃＥｎｅｒｇｙＩｎｔｅｒａｃｔｉｏｎｓｆｏｒＭａｉｎｔｅｎａｎｃｅｏｆＵｐｐｅｒＴｒｏｐｏｓｐｈｅｒｉｃＬｏｗＦｒｅｑｕｅｎｃｙＷａｖｅｓｄｕｒｉｎｇＳｕｍｍｅｒＭｏｎｓｏｏｎ１９８８Ｄ．Ｒ．Ｃｈａｋｒａｂｏｒｔｙａ... 相似文献
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7.
ＥｖｏｌｕｔｉｏｎｏｆＩｎｔｒａｓｅａｓｏｎａｌＯｓｃｉｌａｔｉｏｎｏｖｅｒｔｈｅＴｒｏｐｉｃａｌＷｅｓｔｅｒｎＰａｃｉｆｉｃ／ＳｏｕｔｈＣｈｉｎａＳｅａａｎｄＩｔｓＥｆｅｃｔｔｏｔｈｅＳｕｍｍｅｒＰｒｅｃｉｐｉｔａｔｉｏｎｉｎＳｏｕｔｈｅｒｎＣｈｉ... 相似文献
8.
The Analysis on the Features of the Atmospheric Circulation in Preceding Winters for the Summer Drought and Flooding in the Yangtze And Huaihe River Valley 总被引：12，自引：1，他引：12
ＴｈｅＡｎａｌｙｓｉｓｏｎｔｈｅＦｅａｔｕｒｅｓｏｆｔｈｅＡｔｍｏｓｐｈｅｒｉｃＣｉｒｃｕｌａｔｉｏｎｉｎＰｒｅｃｅｄｉｎｇＷｉｎｔｅｒｓｆｏｒｔｈｅＳｕｍｍｅｒＤｒｏｕｇｈｔａｎｄＦｌｏｏｄｉｎｇｉｎｔｈｅＹａｎｇｔｚｅａｎｄＨｕａｉｈｅＲｉｖｅｒ... 相似文献
9.
《中国气象科学研究院年报》1994,(1)
ＴＨＥＳＴＵＤＹＯＦＰＹＲＯＴＥＣＨＮＩＣＦＬＡＲＥＳＺｈａｎｇＪｉｈｕａｉ（张纪淮）ａｎｄＭａＰｅｉｍｉｎ（马培民）ＩｎｓｔｉｔｕｔｅｏｆＷｅａｔｈｅｒＭｏｄｉｆｉｃａｔｉｏｎＡＢＳＴＲＡＣＴＩｎｏｒｄｅｒｔｏｉｒｎｐｒｏｖｅｔｈｅｏｐｅｒａｔｉｏ... 相似文献
10.
Simulation of East Asian Summer Monsoon with IAP CGCM 总被引：1，自引：0，他引：1
ＳｉｍｕｌａｔｉｏｎｏｆＥａｓｔＡｓｉａｎＳｕｍｍｅｒＭｏｎｓｏｏｎｗｉｔｈＩＡＰＣＧＣＭＣｈｅｎＱｉｙｉｎｇ（陈起英），①ＹｕＹｏｎｇｑｉａｎｇ（俞永强）ａｎｄＧｕｏＹｕｆｕ（郭裕福）ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ，Ｃｈ... 相似文献
11.
By employing the CCM1（R15L12）long-range spectral model, study is undertaken of the effects of
sea surface temperature anomaly(SSTA) for tropical Indian ocean on circulation transformation in the early
summer in East Asia in 1991. The results indicate that warmer SSTA contributes to the increasing of the
temperature over the Plateau in early summer, resulting in the intensification of tropical easterly jet on 100 hPa
and northward shift of Northern Hemisphere subtropical westerly jet in May. It is obviously favorable for the
subtropical high enhancement over western Pacific Ocean in May and subtropical westerly jet maintaining at
35～40 °N in June, making the Mei-Yu come earlier and stay over the Changjiang basin in 1991. Furthermore,
warmer SSTA is also advantageous to averaged temperature rise in East Asia land region and Nanhai monsoon
development. These roles are helpful in accelerating the seasonal transition for East Asia in early summer. 相似文献
12.
Role of the subtropical westerly jet waveguide in a southern China heavy rainstorm in December 2013 总被引：3，自引：0，他引：3
An extreme rainstorm hit southern China during 13–17 December 2013, with a record-breaking daily rainfall rate, large spatial extent, and unusually long persistence. We examined what induced this heavy rainfall process, based on observed rainfall data and NCEP–NCAR reanalysis data through composite and diagnostic methods. The results showed that a Rossby waveguide within the subtropical westerly jet caused the event. The Rossby wave originated from strong cold air intrusion into the subtropical westerly jet over the eastern Mediterranean. With the enhancement and northward shift of the Middle East westerly jet, the Rossby wave propagated slowly eastward and deepened the India–Burma trough, which transported a large amount of moisture from the Bay of Bengal and South China Sea to southern China. Strong divergence in the upper troposphere, caused by the enhancement of the East Asian westerly jet, also favored the heavy rainfall process over Southeast China. In addition, the Rossby wave was associated with a negative-to-positive phase shift and enhancement of the North Atlantic Oscillation, but convergence in the eastern Mediterranean played the key role in the eastward propagation of the Rossby wave within the subtropical westerly jet. 相似文献
13.
青藏高原大气热力异常对西风急流的影响 总被引：1，自引：0，他引：1
本文基于NCEP/NCAR月平均再分析资料,分析了对流层上层200 hPa纬向西风的时空变化特征,并通过EOF分解得到一个表征西风急流位置的指数(Westerly Jet Position Index,WJPI);同时基于对流层中上层(500～200 hPa)温度纬向偏差,构建了一个描述青藏高原(简称高原)大气热力特征的指标(Plateau Atmosphere Heating Index,PAHI),定量分析了该指数与西风急流位置的关系。结果表明:由冬到夏西风急流轴不断北抬西伸,风速逐渐减小;各季西风急流轴均处于西风变率的小值区,表明各季急流均轴的位置较稳定。各季PAHI与200 hPa纬向风的显著正相关区均分布在高原北侧,即高原PAHI增强时,其北侧西风增强,南侧西风减弱,对流层上层西风急流北移;各季WJPI与PAHI之间均存在显著相关,表明PAHI异常对西风急流位置的变化有重要作用。 相似文献
14.
Ｉ．ＩＮＴＲＯＤＵＣＴＩＯＮＥａｓｔＡｓｉａｉｓｓｉｔｕａｔｅｄｉｎｔｈｅｅａｓｔｅｒｎｐａｒｔｏｆｔｈｅＥｕｒａｓｉａｎｃｏｎｔｉｎｅｎｔｗｈｅｒｅｔｈｅｈｕｇｅＴｉｂｅｔａｎＰｌａｔｅａｕｅｘｉｓｔｓ．Ｆａｃｉｎｇｅａｓｔａｎｄｓｏｕｔｈｅａｓｔ... 相似文献
15.
1991年梅雨锋暴雨与锋生环流的诊断分析 总被引：3，自引：5，他引：3
利用原始方程模式锋生环流诊断方程对１９９１年７月一次梅雨锋暴雨过程进行诊断分析。计算结果表明，锋面横向次级环流在低层是一个热力正环流，低空急流出口区的次级环流使锋面附近的上升运动得到加强：１００ｈＰａ青藏高压东侧的偏北风与中层的偏南风耦合形成择流层上层的反环流叠加在锋面横向环流上形成深厚的上升气流区是暴雨发生的动力条件。 相似文献
16.
Summary An intercomparison of the characteristic features of the Indian summer monsoon has been carried out for the monsoon months (June to September) of 1995 using the mean monthly analyses/forecasts from the operational centres of ECMWF, JMA, UKMO and NCMRWF. This exercise was undertaken to determine how well the large scale monsoon features over India were reproduced in the operational output in 1995 and also to assess the performance of the NCMRWF assimilation/forecast system. For this purpose, precipitation, mean sea level pressure, circulation features in the lower (850 hPa) and upper (200 hPa) troposphere, mid-tropospheric (500 hPa) temperature, and latent heat flux were examined.It is found that all the dominant features of the Indian summer monsoon are fairly well represented in the analysis and medium range forecasts of the ECMWF, JMA and UKMO. The NCMRWF output agrees well with those from other centres except for a sharp gradient in precipitation across the west coast which was not captured well in the forecasts due to the relatively coarse horizontal resolution of the model compared to that used at other operational centres. Other important features of the southwest monsoon, like the heat low over the northwestern part of the country, the lower level westerly jet and upper level easterly jet etc. are found to be reasonably well represented in the output of all operational centres. The JMA analyses and forecasts possessed greater levels of moisture compared to the NCMRWF output possibly due to the synthetic moisture information used at JMA. The evolution characteristics of the summer monsoon onset over the southern tip of India are found to be comparable in the output of JMA and NCMRWF.With 13 Figures 相似文献
17.
东亚副热带急流与东北夏季降水异常的关系 总被引：9，自引：3，他引：6
利用东北地区88个气象站点观测的7、8月(夏季)降水量和NCEP/NCAR再分析资料,分析了东北地区夏季降水与同期东亚副热带西风急流之间的关系,发现东北地区夏季降水异常偏多年,位于青藏高原上空200 hPa西风急流中心强度偏强,东北地区上空急流轴向东北方向倾斜;东北地区夏季降水异常偏少年,青藏高原上空200 hPa西风... 相似文献
18.
利用1958～1997年NCEP/NCAR一日四次的风场再分析资料,系统地分析了季节平均西风角动量（即u角动量）经向、垂直输送通量及其三个分量（平均经圈环流、定常波、瞬变涡输送通量）的气候特征,特别是讨论了12～2月、6～8月它们与东、西风带、副热带西风急流、极夜急流之间的联系。结果表明:（1）包含纬度因子的角动量通量与动量通量在高纬地区存在显著差别,高纬对流层上部的强动量输送中心在角动量通量中不明显。而u角动量强经向输送主要在中低纬对流层顶附近和冬半球高纬平流层顶附近,副热带西风急流和极夜西风急流均位于u角动量强向极输送中心及其高纬一侧的辐合区中。（2）发现三个输送分量对急流维持的作用随纬度、季节不同。北半球冬季（夏季）的副热带西风急流主要由平均经圈环流（强度相当的定常波和瞬变涡）强经向输送及辐合维持;南半球西风急流全年均由平均经圈环流和瞬变涡旋输送及辐合维持;冬半球中平流层极夜急流主要由定常波、瞬变涡旋输送及其辐合共同维持。（3）热带东风区是牵连角动量（即Ω角动量）的高值区,它主要由平均经圈环流向对流层上部输送;冬半球副热带及中纬西风区存在u角动量垂直输送的切变区,它主要由平均经圈环流和瞬变涡旋完成;热带对流层顶附近有u角动量的定常波弱向下输送。 相似文献
19.
利用1979-2012年我国160站逐月降水资料、NOAA全球海洋表面温度资料和NCEP-DOE大气环流再分析资料,采用统计分析方法研究了北太平洋海表增暖对我国西北秋雨年代际变化的影响。结果表明:西北秋雨在2000年前后经历了年代际跃变,1986-1999年为少雨期,2000-2012年为多雨期。进一步分析表明:西北秋雨的年代际变化与北太平洋海表增暖关系密切,北太平洋海温偏暖时,东亚一北太平洋地区的大气温度升高,引起东亚地区的南北温差减弱,使东亚西风急流减弱,急流中心偏北,东亚中纬度地区气压升高,导致异常东风水汽输送带偏强,造成西北秋雨异常偏多。 相似文献
20.
Typical Structure, Variety, and Multi-Scale Characteristics of Meiyu Front 总被引：1，自引：0，他引：1 
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下载免费PDF全文 Meiyu front plays an important role in summer rainfall in central China. Based on the GMS-5 satellite images, NCEP reanalyses （2.5°×2.5°） and final analyses （1°×1°） data, and meteorological conventional sounding observations, the horizontal and vertical structures of the Meiyu front were summarized using multiple diagnostic variables, including winds, temperature, jet stream, front, pseduo-equivalent potential temperature, divergence, vertical motion, static instability, etc. In this paper, four cases were selected and analyzed, two of which are in 26-28 June and 23 July 2002 during the Experiment on Heavy Rain in the Meiyu period in the lower reaches of the Yangtze River, and the others are in May and July 1998. The two cases in July 1998 and July 2002 are the secondary Meiyu front cases. The results show that the structures and characteristics of the Meiyu front are different for various cases, or at various places and time, or at various stages of one case, and the frontal characteristics can be converted from the polar front to the equatorial front. Because of the interaction of the different scale circulations in the high and low latitudes, the horizontal structure of the Meiyu front has various forms.
The results in this paper also show that the typical Meiyu front consists of a narrow band with a high gradient of potential equivalent temperature below 500 hPa, south of which is warm and moist air mass, and north of which is the transformed air mass from the midlatitude ocean or polar continent. Below the mid troposphere, south of the front blows southwesterlies, while north blows easterlies. The ascending motion and precipitation usually occur ahead of the Meiyu front. In the upper troposphere, the subtropical front is above the Meiyu front, but two fronts are separated. In addition, the upper westerly jet stream and the easterlies to the south of the Meiyu front result in the upper divergent flow field.
The multi-scale characteristics of the horizontal structure of the Meiyu front can 相似文献
The results in this paper also show that the typical Meiyu front consists of a narrow band with a high gradient of potential equivalent temperature below 500 hPa, south of which is warm and moist air mass, and north of which is the transformed air mass from the midlatitude ocean or polar continent. Below the mid troposphere, south of the front blows southwesterlies, while north blows easterlies. The ascending motion and precipitation usually occur ahead of the Meiyu front. In the upper troposphere, the subtropical front is above the Meiyu front, but two fronts are separated. In addition, the upper westerly jet stream and the easterlies to the south of the Meiyu front result in the upper divergent flow field.
The multi-scale characteristics of the horizontal structure of the Meiyu front can 相似文献