共查询到20条相似文献，搜索用时 173 毫秒
1.
Monsoons over China 总被引：14，自引：0，他引：14
《大气科学进展》1994,(2)
ＭｏｎｓｏｏｎｓｏｖｅｒＣｈｉｎａ￥ｂｙＤｉｎｇＹｉｈｕｉ（ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＭｅｔｅｏｒｏｌｏｇｉｃａｌＳｃｉｅｎｃｅｓ，Ｂｅｉｇｕｇ，Ｃｈｉｎａ）ＡＴＭＯＳＰＨＥＲＩＣＳＣＩＥＮＣＥＳＬＩＢＲＡＲＹ，１６Ｔｈｅｍｏｎｓｏｏｎｏｖｅｒ... 相似文献
2.
《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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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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Yong L. McHall 《大气科学进展》1994,11(2):251-251
ＡｎＩｎｔｒｏｄｕｃｔｉｏｎｔｏｔｈｅＮｅｗＢｏｏｋ－ＧＥＯＳＴＲＯＰＨＩＣＷＡＶＥＣＩＲＣＵＬＡＴＩＯＮＳ￥Ｙｏｎｇ．Ｌ．ＭｃＨａｌｌＤｅｐｔ．ｏｆＥａｒｔｈ，ＡｔｍｏｓｐｈｅｒｉｃａｎｄＰｌａｎｅｔａｒｙＳｃｉｅｎｃｅｓ，ＭＩＴＰｕｂｌｉｓｈｅｄ... 相似文献
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宋玉成，黄荣辉ＴｈｅＤｙｎａｍｉｃａｌＥｆｆｅｃｔｓｏｆＤｉｖｅｒｇｅｎｔＷｉｎｄｏｎｔｈｅＩｎｔｒａｓｅａｓｏｎａｌｖａｒｉａｂｉｎｔｙｏｆｔｈｅＥａｓｔＡｓｉａｎＣｉｒｃｕｌａｔｉｏｎ￥ＳｏｎｇＹｕｃｈｅｎｇａｎｄＨｕａｎｇＲｏｎｇｈｕｉ（Ｉｎｓ... 相似文献
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ＴｈｅＥｆｅｃｔｏｆＨｅａｔｉｎｇＡｎｏｍａｌｙｏｎｔｈｅＡｓｉａｎＣｉｒｃｕｌａｔｉｏｎ－ＡＧＣＭＥｘｐｅｒｉｍｅｎｔ①ＷａｎｇＨｕｉｊｕｎ（王会军）ＬＡＳＧ，ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙ... 相似文献
8.
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
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Yan Junyue 《大气科学进展》1997,14(2):277-287
ＯｂｓｅｒｖａｔｉｏｎａｌＳｔｕｄｙｏｎｔｈｅＯｎｓｅｔｏｆｔｈｅＳｏｕｔｈＣｈｉｎａＳｅａＳｏｕｔｈｗｅｓｔＭｏｎｓｏｏｎＹａｎＪｕｎｙｕｅ（阎俊岳）ＮａｔｉｏｎａｌＣｌｉｍａｔｅＣｅｎｔｅｒ，Ｂｅｉｊｉｎｇ１０００８１ＲｅｃｅｉｖｅｄＮｏｖｅｍｂ... 相似文献
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In this paper, the evolution of intraseasonal oscillation over the South China Sea and tropical western Pacific area and its effect to the summer rainfall in the southern China are studied based on the ECMWF data and TBB data) analyses. A very low-frequency waves exist in the tropics and play an important role in dominating intraseasonal oscillation and lead to special seasonal variation of intraseasonal oscillation over the South China Sea / tropical western Pacific area. The intraseasonal oscillation (convection) over the South China Sea and tropical western Pacific area is closely related to the summer rainfall (convection) in the southern China. Their relationship seems to be a seesaw feature, and this relationship resulting from the different pattern of convection in those two re-gions is caused by the different type of local meridional circulation 相似文献
12.
It is well known that suppressed convection in the tropical western North Pacific(WNP) induces an anticyclonic anomaly,and this anticyclonic anomaly results in more rainfall along the East Asian rain band through more water vapor transport during summer, as well as early and middle summer. However, the present results indicate that during late summer(from mid-August to the beginning of September), the anomalous anticyclone leads to more rainfall over central southern China(CSC), a region quite different from preceding periods. The uniqueness of late summer is found to be related to the dramatic change in climatological monsoon flows: southerlies over southern China during early and middle summer but easterlies during late summer. Therefore, the anomalous anticyclone, which shows a southerly anomaly over southern China, enhances monsoonal southerlies and induces more rainfall along the rain band during early and middle summer. During late summer,however, the anomalous anticyclone reflects a complicated change in monsoon flows: it changes the path, rather than the intensity, of monsoon flows. Specifically, during late summers of suppressed convection in the tropical WNP, southerlies dominate from the South China Sea to southern China, and during late summers of enhanced convection, northeasterlies dominate from the East China Sea to southern China, causing more and less rainfall in CSC, respectively. 相似文献
13.
This study investigates the relationship between summer low-frequency rainfall over southern China and tropical intraseasonal oscillation (ISO) in the atmosphere by examining systematically the propagation features of the tropical ISO in terms of focusing on five large-scale low-frequency rainfall regimes in summer over southern China. It is demonstrated that there is a close linkage between the five rainfall regimes over southern China and the northward propagation of the tropical ISO. The moist ISO signals, which influence the low-frequency rainfall events in different regions of southern China, mainly propagate northwestward from the tropical ocean to the southeast of China. The southeast China rainfall regime is intimately associated with the moist ISO signals propagating northwestward from the equatorial mid-western Pacific Ocean. For both the Yangtze River regime and South of Yangtze River regime, the moist ISO signals over the northern South China Sea show an evident northward propagation towards the Yangtze River region, and then propagate westward. It is further found that the interaction between the northward propagation of low-latitude ISO signals and the southward propagation of high-latitude ISO signals can also make a clear influence on the low-frequency rainfall in southern China. For the Southern China regime, the moist ISO signals show a significant northward propagation from the Philippines. Moreover, for the rainless regime, southern China is under dry ISO signals’ control, and the latter shows no clear propagation to southern China. This study may provide insights for the extended-range forecasting of summer rainfall in southern China. 相似文献
14.
Contribution of south China Sea tropical cyclones to an increase in southern China summer rainfall around 1993 总被引：3，自引：0，他引：3
The increase in southern China summer rainfall around 1993 was accompanied
by an increase in tropical cyclones that formed in the South China Sea. This
study documents the connection of these two features. Our analysis shows
that the contribution of tropical cyclones that formed in the South China
Sea to southern China summer rainfall experienced a significant increase
around 1993, in particular, along the coast and in the heavy rain category.
The number of tropical cyclones that formed in the western North Pacific and
entered the South China Sea decreased, and their contribution to summer
rainfall was reduced in eastern part of southern China (but statistically
insignificant). The increase in tropical cyclone-induced rainfall
contributed up to ～30% of the total rainfall increase along the
coastal regions. The increase of tropical cyclones in the South China Sea
appears to be related to an increase in local sea surface temperature. 相似文献
15.
Intraseasonal Oscillation of the South China Sea Summer Monsoon and Its Influence on Regionally Persistent Heavy Rain over Southern China 
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下载免费PDF全文 The intraseasonal oscillation（ISO） in the South China Sea summer monsoon（SCSSM） and its influence on regionally persistent heavy rain（RPHR） over southern China are examined by using satelhte outgoing long wave radiation,NCEP/NCAR reanalysis,and gridded rainfall station data in China from 1981 to 2010.The most important feature of the ISO in SCSSM,contributing to the modulation of RPHR,is found to be the fluctuation in the western Pacific subtropical high（WPSH）,along with a close link to the Madden-Julian oscillation（MJO）.Southern China is divided into three regions by using rotated empirical orthogonal functions（REOFs）for intraseasonal rainfall,where the incidence rate of RPHR is closely linked to the intraseasonal variation in rainfall.It is found that SCSSM ISOs are the key systems controlling the intraseasonal variability in rainfall and can be described by the leading pair of empirical orthogonal functions（EOFs） for the 850-hPa zonal wind over the SCS and southern China.Composite analyses based on the principal components（PCs） of the EOFs indicate that the ISO process in SCSSM exhibits as the east-west oscillation of the WPSH,which is coupled with the northward-propagating MJO,creating alternating dry and wet phases over southern China with a period of 40 days.The wet phases provide stable and lasting circulation conditions that promote RPHR.However,differences in the ISO structures can be found when RPHR occurs in regions where the WPSH assumes different meridional positions.Further examination of the meridional-phase structure suggests an important role of northward-propagating ISO and regional air-sea interaction in the ISO process in SCSSM. 相似文献
16.
The spatio-temporal variability in summer rainfall within eastern China is identified based on empirical orthogonal function
(EOF) analysis of daily rain-gauge precipitation data for the period 1979–2003. Spatial coherence of rainfall is found in
the Yangtze Basin, and a wavelet transform is applied to the corresponding principal component to capture the intraseasonal
oscillation (ISO) of Yangtze rainfall. The ensemble mean wavelet spectrum, representing statistically significant intraseasonal
variability, shows a predominant oscillation in summer Yangtze rainfall with a period of 20–50 days; a 10–20-day oscillation
is pronounced during June and July. This finding suggests that the 20–50-day oscillation is a major agent in regulating summer
Yangtze rainfall. Composite analyses reveal that the 20–50-day oscillation of summer Yangtze rainfall arises in response to
intraseasonal variations in the western North Pacific subtropical high (WNPSH), which in turn is modulated by a Rossby wave-like
coupled circulation–convection system that propagates northward and northwestward from the equatorial western Pacific. When
an anomalous cyclone associated with this Rossby wave-like system reaches the South China Sea (SCS) and Philippine Sea, the
WNPSH retreats northeastward due to a reduction in local pressure. Under these conditions, strong monsoonal southwesterlies
blow mainly toward the SCS–Philippine Sea, while dry conditions form in the Yangtze Basin, with a pronounced divergent flow
pattern. In contrast, the movement of an anomalous anticyclone over the SCS–Philippine Sea results in the southwestward extension
of the WNPSH; consequently, the tropical monsoonal southwesterlies veer to the northeast over the SCS and then converge toward
the Yangtze Basin, producing wet conditions. Therefore, the 20–50-day oscillation of Yangtze rainfall is also manifest as
a seesaw pattern in convective anomalies between the Yangtze Basin and the SCS–Philippine Sea. A considerable zonal shift
in the WNPSH is associated with extreme dry (wet) episodes in the Yangtze Basin, with an abrupt eastward (westward) shift
in the WNPSH generally leading the extreme negative (positive) Yangtze rainfall anomaly by a 3/8-period of the 20–50-day oscillation.
This finding may have implications for improving extended-range weather forecasting in the Yangtze Basin. 相似文献
17.
本文系统地回顾了作者近年来关于南海-热带西北太平洋地区大气和海洋季节内尺度变化关系方面的主要研究成果。文中对10~20天和30~60天两种季节内振荡海气变化关系的不同以及冬、夏季间的差异进行了系统地比较。相比较而言,大气中10~20天振荡所占比例大于30~60天振荡,海表温度30~60天的振荡在南海和西北太平洋副热带地区比10~20天振荡的贡献大,而在低纬度西太平洋地区10~20天振荡与30~60天振荡贡献相近或稍大。在北半球夏季,10~20天低频振荡的分布呈西南—东北走向,由赤道西太平洋地区向西北偏西方向传播,而30~60天低频振荡则以东西向分布为主,表现为由南向北的传播特征。在北半球冬季,10~20天和30~60天两种低频振荡的水平结构类似,均表现为西南—东北走向;同时,南海地区季节内变化信号表现出明显的向南传播的独特特征,并与东亚冬季风的季节内变化密切相关。北半球夏季,南海—菲律宾海地区10~20天低频振荡强度在厄尔尼诺发展年得到加强,而30~60天低频振荡强度则在拉尼娜衰减年得以加强。分析还指出,热带西北太平洋地区夏季热带辐合带附近的季节内变化,尤其是10~20天尺度变化,对季节平均海表温度异常有显著的反馈作用。 相似文献
18.
Teleconnections associated with Northern Hemisphere summer monsoon intraseasonal oscillation 总被引：1，自引：0，他引：1
The boreal summer intraseasonal oscillation (BSISO) has strong convective activity centers in Indian (I), Western North Pacific (WNP), and North American (NA) summer monsoon (SM) regions. The present study attempts to reveal BSISO teleconnection patterns associated with these dominant intraseasonal variability centers. During the active phase of ISM, a zonally elongated band of enhanced convection extends from India via the Bay of Bengal and Philippine Sea to tropical central Pacific with suppressed convection over the eastern Pacific near Mexico. The corresponding extratropical circulation anomalies occur along the waveguides generated by the North African-Asian jet and North Atlantic-North European jet. When the tropical convection strengthens over the WNPSM sector, a distinct great circle-like Rossby wave train emanates from the WNP to the western coast of United States (US) with an eastward shift of enhanced meridional circulation. In the active phase of NASM, large anticyclonic anomalies anchor over the western coast of US and eastern Canada and the global teleconnection pattern is similar to that during a break phase of the ISM. Examination of the evolution of the BSISO teleconnection reveals quasi-stationary patterns with preferred centers of teleconnection located at Europe, Russia, central Asia, East Asia, western US, and eastern US and Canada, respectively. Most centers are embedded in the waveguide along the westerly jet stream, but the centers at Europe and Russia occur to the north of the jet-induced waveguide. Eastward propagation of the ISO teleconnection is evident over the Pacific-North America sector. The rainfall anomalies over the elongated band near the monsoon domain over the Indo-western Pacific sector have an opposite tendency with that over the central and southern China, Mexico and southern US, providing a source of intraseasonal predictability to extratropical regions. The BSISO teleconnection along and to the north of the subtropical jet provides a good indication of the surface sir temperature anomalies in the NH extratropics. 相似文献
19.
Intraseasonal variations of the Yangtze rainfall and its related atmospheric circulation features during the 1991 summer 总被引：5，自引：0，他引：5
The intraseasonal variations of the Yangtze rainfall over eastern China and its related atmospheric circulation characteristics during the 1991 summer are examined based on the gauge-observed rainfall and the NCEP/NCAR reanalysis data. Wavelet analysis shows that during the 1991 summer, the active and break sequences of rainfall over the middle and lower Yangtze Basin are mainly regulated by an oscillatory mode with a period of 15–35 days. An investigation of the circulation features suggests that the 15–35-day oscillation is associated with an anomalous low-level cyclone (anticyclone) appearing alternatively over the northern South China Sea (SCS) and the Philippine Sea, and related to a northeastward (southwestward) shift of the western Pacific subtropical anticyclone over the SCS, leading to a lower tropospheric divergence (convergence) over the Yangtze Basin. In the upper troposphere, the 15–35-day oscillation exhibits a dipole anomaly characterized by an anomalous cyclone (anticyclone) over eastern China and an anomalous anticyclone (cyclone) over the northern Tibetan Plateau, resulting in a southwestward shrinking (northeastward extending) of the South Asian anticyclone, and forming a convergence (divergence) over eastern China. Such a coupled anomalous flow pattern between the lower and upper troposphere favors large-scale descending (ascending) motion, and hence reduced (enhanced) rainfall over the Yangtze Basin. Dynamically, the intraseasonal variations in the Yangtze rainfall are mainly determined by the coupling between the low-level relative vorticity and the upper-level divergence. In the middle troposphere, the 15–35-day oscillation of the subtropical high is originated over the central North Pacific north of Hawaii, then propagates westward to the SCS-Philippine Sea, and finally modulates the intraseasonal variations of the Yangtze rainfall. 相似文献
20.
LI Chongyin LING Jian SONG Jie PAN Jing TIAN Hu CHEN Xiong 《Acta Meteorologica Sinica》2014,28(5):671-692
Tropical intraseasonal oscillation (including the Madden-Julian oscillation) is an important element of the atmospheric circulation system. The activities and anomalies of tropical intraseasonal oscillations affect weather and climate both inside and outside the tropical region. The study of these phenomena therefore represents one of the frontiers of atmospheric sciences. This review aims to synthesize and summarize studies of intraseasonal oscillation (ISO) by Chinese scientists within the last 5-10 years. We focus particularly on ISO's mechanisms, its numerical simulations (especially the impacts of diabatic heating profiles), relationships and interactions with ENSO (especially over the western Pacific), impacts on tropical cyclone genesis and tracks over the northwestern Pacific, and influences on the onset and activity of the South and East Asian monsoons (especially rainfall over China). Among these, focuses of ongoing research and unresolved issues related to ISO are also discussed. 相似文献